I pulled out the Mak180 tonight to see if I could image the Moon. After setting up I did not bother with polar alignment due to it really only being the planets which are less picky about tracking. However pointing is another matter.
I have decided I really must get a decent flip mirror. At the moment with the polar alignment not being completed and the chip on the ZWO ASI290MC being so small, I have to take the camera out to then eyeball the planet before putting the camera back in so that its light lands on the chip. Now with the Moon that is not a problem so tonight I did not have to worry.
View from the bridge
Given the short imaging session this evening and the realisation that I had not gotten rid of all the dust from last years dust intrusion I took a single video run of a yet to be identified piece of the Moon.
Raw video footage
I then moved decided to take some video footage of various parts of the Moon to also discover how much dust I had and how much of a problem it was going to be. Also I just like roving around the surface of the Moon.
Raw video of Clavius
I must also buy another ASI290MC as the one I have had its chip cover fall off and I have been unable to remove the dust from Coombe Gibit, so for guiding this is not an issue but for Moon and planets it is. Given I currently take the camera off the Skywatcher Esprit setup where it is used as a guider I might as well have another and then I won’t ever get dust in the new one which I would use on the Mak. As I’ve said before and will say again, Brendan would say it is cheaper to burn £50 notes than get into astronomy! How true indeed.
It’s been slow going since January. Lots of cold weather, rain and broken ribs had stopped me in my tracks from concreting the pier block. However on 21st February I finally had warm enough weather and a lot of help from Luke to start pouring.
6 buckets of ballast……
We placed some flint in the bottom of the hole to help reduce the amount of concrete needed and to push up against the chalk. We then started measuring the cement and ballast out. We used Bob’s notes from our last concreting party which was 6 x 10kg buckets of ballast to 2 x 6kg buckets of cement. The water we used a bucket with a marker pen line on and then heaved it into the cement mixer.
Good slump test
The first slump test was perfect. The first pour looked good too. 2 hours in and we were 2/3rds done and nearly up to the downpipes that is to be used for cabling.
2/3 of the way there
Before we started I made sure the wood former was level all the way around. This makes it super easy when pouring concrete, so as long as you pour to the top of the former it will be level as we proved on the final pour.
Luke does the final touches
We then took 3 pieces of rebar that were lying around the garden and placed them where the pier would go. We performed a test fit of the pier housing, some air-conditioning duck so make sure the pier was central to the block. I must at this point thank Ian Piper who’s idea it had been to put the concrete pier in. At a cost of around £50 for the material this would be far cheaper than the £1,000 pier I purchased in the past and the £500 not so great pier I purchased from Pulsar Observatories.
A job well done 🙂
After just over 3.5 hours we had finished and that included the final brushing over the concrete to make it smooth. Thanks Ian for the pier suggestions, Bob for the mixer, Mark for the enthusiasm, Luke for the help, Nigel for the base design and of course Helen for putting up with me and my hobby. A good start, next stop was to concrete the dome base.
Holiday time! Well at least a week off work. It’s been a cold and cloudy Winter so far. So a night where I can get out the travel telescope and setup in the vegetable patch, the construction site of IMT3b is a good thing. The challenge I have is my ribs still hurt somewhat from being broken after an unfortunate accident 4 weeks ago. So I will go careful.
Earlier in the day I had Luke help me setup the equipment in the garden. First the binos to have a good look round.
Altair Astro 100mm Binoculars and APM Mount
Then we setup the Skywatcher Esprit 120 ED on the Paramount MyT.
Travel scope with QHY168C camera
Lastly we setup a “warm room” temporary in nature and fairly cold I would later find out 🥶 in the greenhouse.
Lovely new table with my cool astronomy chair and MacBook Pro
So the night came and after Pizza with my wife I set off out to the garden to start imaging.
Imaging M42 Orion Nebula
I connected the Polestar camera first to see what my alignment was like after placing the tripod down in a fashion I though condusive to being polar aligned.
This is where polaris landed up which is not bad.
I then set about measuring the difference in Polaris to determine how much I would need to move the scope to align it.
White cross is where it needs to be
I then fiddled with the altitude and azimuth knobs to align the scope.
Perfect alignment
Next I slewed to the first object for the evening which was M45, the Pleiades, the Seven Sisters. I started EZCap and look at the focus which was not far off from the last time I was out a few weeks and it is good enough.
EZCap focus control
I then took an image of M45 to make sure it was in the field of view. I also setup the Planner in EZCap to with the sequence for capturing the data. I set the camera to Gain 7 and Offset 20 with a temperature of -30℃.
EZCap Planner
I set PHD running and that was when I hit a problem. To cut a long story short, I had forgotten to plug in the ST4 guider cable into the ZWOASI290 camera and then into the Versa plate of the Paramount MyT. Without this there is no successful calibration within PHD. It took me 1 hour to work out I needed a cable and a further 45mins to find it since the move of house. Your IQ really does drop when it is dark and cold!
Guiding started, but gusts of wind!
Eventually the calibration completed once the cable was fitted and I could start to see the gusts of wind in the data. I set a sequence running for M45 and was impressed with the results. I took 10 x 90s and 10 x 180s.
M45
I then switched targets and headed over to M42 and M43 along with the Running Man nebula, also known as SH2-279 and NGC 1977. I took 30 x 60s, 30 x 30s and 10 x 180s.
M42
Next and what would be last on my list tonight was M35 along with NGC 2158. I took 10 x 90s and 10 x 60s starting around 23:45.
M35
Now the clouds at a high level started to roll in. So I decided to take some Flats and then take the darks tomorrow morning.
Flats
So I packed up and had one last look up at the night sky.
It is clear! It has been some time, at least for me, when it is clear at a weekend. It is cold. Skippysky.au/europe tells me it is good seeing, the transparency is excellent and the Jet Stream is way South of the UK. The Moon is around 70% and the local temperature is -2 degrees C with a slight frost already. I have come out with my 100mm binoculars to star hope around.
Binos ready and waiting
I had just finished a call with the BASEG society, most whom I had not seen in some time as we are still in lockdown. I came out to a Moonlit garden with a carpet of ice twinkling and crunching as I walked. It is nice to see this new garden at night and get a feel for where I may observe in the future.
I setup the binos in the vegetable patch next to the building works for IMT3b. Not one but twice I stumbled down the trench dug for the cables, so I must be more careful. I then pointed the binos at the Moon and took a look.
afocal Moon
The view was splendid. There is something wonderful about seeing the Moon through binoculars and seeing just how deep you can go. Clavious was crips and easy to spot as was Tyco. I spent some time here and then Luke came out to view. We looked at the Moon first then I moved to M42 which, whilst washed out by the Moon, was still bright enough to see the distinct wings. The trapezium was also very clear indeed.
After a call to Gingergeek, who incidentally was having problems with a disconnected wire in his focuser, I moved onto M45 Pleiades to identify each of the 11 major stars fro Atlas in the West to 18 Tau in the East. Electra, Merope and Alcyone were all rather bright. I then swooped across to Aldebaran before moving across to Mars, the bright planet a small circle in the binos. I then star hopped to M33 to find the surrounding stars without being able to see the galaxy itself.
Mark Radice then called and we chatted about his C11 and the Sinus Iridum mosaic he was imaging tonight whilst sitting in his warm room. We spoke about things to look at and Mark remotely star hoped me to the double cluster, which surprisingly could be seen naked eye, even on this bright Moon night. He then guided me to Uranus which I found in a pattern with 2 other stars making up an isosceles triangle with Uranus being distinctly blue to the bottom right. I was then fairly cold so bid farewell to Mark and headed off indoors to warm up.
So the cable is installed in the trench visible here before I laid the ethernet.
Power cable
It runs all the way across the garden to the observatory very neatly.
Power cable across the lawn
When it reaches the observatory, enough cable is left to feed through there pipe later and the end is terminated in an outside socket. This will be later daisy chained to several internal plug to the observatory and the outside power fixed to a new brick pier that I will build.
Observatory end
The next job was running the ethernet from the house. I purchased Cat6E as I also wanted to run cable to several places around the house that would require PoE (Power over Ethernet) which allows one to fix an access point without the need for an additional power supply. I started by preparing one end of the cable to be spliced and crimped given I had not done this for a few decades. I purchased the crimping and test equipment online and it seems to have worked well.
Cat6E prep
Then I laid out the wires in the correct colour format. The tricky part is getting all the wires to stay flat after twisting round each other to get them in the right order. Then to make matters worse you cut them short to much the connector on and the cables self align in slots.
Cat6E
The final end looks like this.
Crimped Cat6E
Out of interest I have posted here the access point I purchased that is PoE, I simply love it, although nothing to do with the observatory per say apart from going into the kitchen in this instance at the same time as running the cable to the observatory.
PoE AP
The AP does require a switch or hub or router that supports PoE, unfortunately none of the hubs that come from the major broadband suppliers ship any so I purchased the TP-Link switch that does.
TP-Link PoE switch
To conclude this part here is the single Cat6E cable going into the AP.
Back of access point
So then I set about running the cable from the observatory site across the garden with an RJ45 connector ready and waiting under the tarpaulin at the vegetable patch.
Ethernet CAT6E cable installed long with power.
I then terminated the first leg of the cables journey in the woodshed where the power is connected (I plane to spur a connection to the planned Summerhouse from here in the Spring) and setup my laptop in the vegetable patch to test the connection which worked!
Testing the connection
Before I get to the final piece of ethernet running from the woodshed to the workshop, I wanted to run the large length of cable from the workshop to the Snug. I am fortunate that a BT cable had been run back in the 90’s to the workshop when it was used as a business office. Given I had no need for a landline in the workshop I decided to use the BT cable to pull through the ethernet down the length of the underground pipe between the workshop and the house, again I am very lucky it was there!
Old BT cable and duct comes in handy 🙂
I started to feed the cable through along with a new piece of rope I found in another duct! But I quickly found a break in the pipe located under the steps leading into the workshop.
Duct broken just outside 🙁
After hours of pulling and pulling back the other way, then more pulling, my daughters boyfriend Luke (small mercies for Lockdown he currently lives with us) retrieves the ethernet cable taped to the BT cable some 100ft away.
Ethernet comes through 🙂
This is the BT connection rats nest at the back of the house who’s cable I repurposed then removed, next to a bunch of electric connection boxes for outside stuff!
The saga for ethernet does not stop there, but nearly! We pulled through the rest of the cable and tacked it up the wall on the right and then along to the door where we spend hours drilling and hunting for the cable in the loft………..
Cable ready to go into the house
Darkness falls as we finally pull the cable through into the house and into the Snug.
Ethernet cable into the loft and the house.
Here is the tight loft space where the cable runs through.
Loft eaves and ethernet cable
The final leg was dropping the cable into the Snug where the fibre terminates in the house from the loft. It snakes it’s way around the perimeter of the house inside the loft (I have a chalet bungalow) which took about 2 hours!
Main ethernet connection to observatory!
Fortunately I have the most understanding wife in the world who is very supportive to have her husband spend hours in the loft with a cable.
So with the site prepared I had one last check of the levels as the ground slopes away to the right thus meaning I needed to adjust the former for the central block. The dome segments can be seen resting in the background. I also used a large bag of stones to hold the former in place.
Slopping site
Next I cut a hole in the former for the pipework that will take the electric cable and ethernet from the house. I used some old downpipes and kitchen waste pipe I found lying around in the garden.
Pipework for cables
Here is a closer shot of the pipework that shows a 90 degree angle that all be flush with the finished floor.
Closeup of pipes
Now I had to prepare a trench for the cable running from the observatory to one of the sheds across the garden. So GingerGeek and I set about digging 6″ down where the cables would lay, eventually to be covered by a slabbed path. The digging took hours, hitting rubble including glass in the ground and offending chunks of flint.
About 70 feet trench across part of the garden
Down to the left as the ground slopes away and towards the observatory location, we dug the trench round the corner. The cable would have to run under large rotes and as we found out a large sleeper buried in the ground across the opening to the vegetable patch.
Entrance to observatory area
Turning around standing with your back to the vegetable patch where the observatory will be sited, you can see the trench running off towards some outbuildings/sheds and a planted area that I would have to tackle next as GingerGeek had to go do some chores at home.
Planting area to be dug through!
So it took almost as much time digging this section out as it did getting across the expanse of lawn. Routes from the Sycamore (left) and countless plants made this hard work. I then managed to get to the trellis separating the planting from the 3 sheds on this side of the garden, which I would need to go under.
Trench within boarder
Around the other side of the trellis it was very cosy to work in the tight space, old wood still awaiting collection by the previous owner meant digging was difficult, also the land raises up quite a bit this side so I had to dig the trench deeper. The hole I managed to create is shown by the red arrow. Again lots of building rubble had to be removed and I landed up on my hands and knees in the trench digging with a trowel.
Hole to the other side!
So I had made it to the shed. Now it was dark and I had to wait another month before Steve the electrician would be able to fit me in. When he arrived and the armoured cable was laid and fed under all the roots, he made the connection in the existing fusebox in the shed.
Observatory connection left.
Then it ran down the wall and out through a hole that was serving the existing power feed from the workshop. The woodshed is in a dire state and needs replacing, but will serve as a hub for equipment until such time I get around to it.
Cable out of the very unloved woodshed.
Next I will share where the power and ethernet cable runs and how I installed.
So now the work begins. How to turn a vegetable patch into an observatory. The first thing any good person does when moving into a house is perform a harvest! So we set about harvesting and found some rather large parsnips (which we have been having every Sunday lunchtime since) 🙂
Luke with one of the smaller parsnips
Once done, we removed the edging boards and marked out the dome diameter using the stakes we found in the garden.
The footprint of the 2.7m IMT3b
Once done I left Luke to dig the rest of the dome base out with a little help from my daughter and as you can see digging in a vegetable patch is rather easier to start with than hard ground due to years of using the land.
Dome base dug out….but what about the pier hole?
Okay, so that’s the dome base which is a nice 6″ deep. Next, which was a slightly bit more problematic was to dig out the pier base through chalk to a depth of 65cm x 1m wide. Yes I know I am mixing my scales but that is because I can 🙂
Pier base
I then had to wait several weeks for the weather to improve before I could start creating the former for the hole.
Plywood former for the pier base
I must add at this point, that despite building and installing many domes before, I sought out the experience as one should, of another astronomer and friend, Nigel, who sent me a well prepared document of contracting a concrete base, that I have used as extra guidance on this dome build.
View from above with locally sourced (in my ground) flint to be used as sub base
Next up will be more preparation for the foundations and connecting the electric and ethernet from the house some 100m away the way I have to run the cables!
So after the shortest time in a house, I have now moved to a much better astronomy home, surrounded by fields and forests, ancient woodland and with some of the darkest skies in the North Hampshire Downs. I am fortunate in my location, however less fortunate that the build of this observatory, unlike my other observatories is happening in the middle of a pandemic of Covid-19. This as you will see makes it extremely hard when you can’t have astronomer friends over to help with the preparation and installation.
The move started to with the dismantling of IMT3 and in the final days at the previous house we dismantled the dome, at least at the time I could have some friends over to the garden to help with Mil Dave, Alan and Shane lending a much needed hand.
Dome has gone!
So on a quick dismantling, which was much quicker than constructing the astronomers put the dome segments on the lawn 🙂
Oh there it is 🙂
However as I found that night when a storm front came through, which caused me and my daughters boyfriend to get up after midnight to secure the dome segments in a more wind resistance piece of the premises.
Wind resistent place
The following day Luke has had his first angle grinding lesson to take out the remains of the bolts and plugs which to be honest I think he really enjoyed.
Luke’s lesson
Then the moving day came and I put all the important scientific astronomy equipment in my old Landy to make sure it got there safely.
12 Inch Officina Stellarie
whilst the rest of the observatory went in a further truck kindly supplied for free by our removal company who are the best removal company ever! Thanks Camberley Removals!
IMT3 tucked up and ready for shipping
By mid November, some 4 months after we accepted an offer on the house I landed up with my new more astro friendly observing location surrounded by fields.
IMT3b Location is a vegetable patch
Next up is removal of the local vegetation and preparing the ground for concreting.
The most funny thing about moving to a new house is assuming you have understood your horizons correctly, well at least I found it funny when I got it wrong. After several attempts to catch the conjunction, traveling out to a nearby field with low horizons, Christmas Eve was no difference. I had set off, this time with the Esprit 120 and QHY168C and on arriving at the location realising that the weather was too cloudy to grab the conjunction.
So off I went back home. I decided to wonder up the garden to see if the weather had cleared when I returned, to find that not only was there a gap on the clouds, but also I could see Jupiter !!! This meant only one thing, that my South West horizon was not +15 degrees but actually +4 degrees! Wow that is good and lucky.
View South West , observatory is going to be in front of the foreground trees
I ran back to the car and started hauling the travel scope to the building site of IMT3b which is currently a vegetable patch, this is around 200 feet away from the car part way down the garden. It took 5 trips to move all the equipment, good for my Apple watch exercise rings, not so good for the setting of the conjunction of Jupiter and Saturn. By the time I setup and slewed the telescope round the pair were setting behind the ancient forest in the distance but I managed to snap a single image! Perfect.
Jupiter and Galilean Moons with Saturn below – 120 Esprit and QHY168CCropped
The weather forecast suggested that this was the only clear night for some time and the planets were low in the sky. So GeekGirl and I wondered if Jupiter/Saturn were visible from the front of the house to the South-West or if we were going to have to traipse over to the muddy farm fields to view the conjunction.
Conjunction View Facing South – Credit stellarium.org
Luckily for us even though they were less than 10º altitude we could see them both between two houses from the front drive. We quickly got some warm gear on and setup the binoculars and the kiddy scope (Sky-Watcher Heritage 150P Dobsonian) on a camping table.
We quickly got Jupiter/Saturn in GeekGirl’s binoculars (Celestron 20×80 SkyMaster). The pairing although not as close as they would be on the 21st still looked nice. The rings of Saturn were discernible and the four Galilean moons were visible in this modest setup and I’m sure the view would be have been better in Dave’s monster binoculars due to the aperature.
Approximate view through 20×80 Binoculars – Credit stellarium.org
In order to get the focus for the planets I used the Heritage 150P on the near half Moon (47%). The views of the craters on the terminator along with the shadows were amazing, we could see the centre peaks of many of the craters.
View via Heritage150P/Super10 eyepiece – Credit stellarium.org
I wonder what they looked like in Dave’s Sky-Watcher SkyMax 180 Pro ?
Our next-door neighbour popped out and we invited him to view the planets and the Moon. I think he was impressed but everyone reacts differently to the experience.
Once we had both wondered over the Moon, checking out the mountain ranges and the changing shades of grey for the Mares we turned to viewing the conjunction in the 150P using the standard eyepieces (SW Super25 & Super10) that came with the scope.
View of Conjunction through Heritage150P – Credit stellarium.org
We could see all four Galilean moons with Io being placed close to Jupiter’s limb. The division in Saturn rings was visible and GeekGirl could glimpse Titan so she was happy. All in all a pleasant experience, which is rare in the current human malware situation. I finished off the evening with a Brewdog IPA ….. bliss !
Dave Shave-Wall viewing
Start time 3pm – End time 6pm
After deciding that I could not get the conjunction of Saturn and Jupiter at the new house, I spent the best part of 40 minutes packing up the travel scope to travel locally to view the conjunction. I set off to view about 1 mile away across a field with allow horizon. I took my Mak180 without the Barlow and the ZWO290MC on the Paramount MyT with the Berlebach tripod. On arriving at the side of the road on the narrow country lane in North Hampshire, I was just about to setup when I realised not only had I forgot the travel car battery, but also the laptop. After a few expletives and a good old English, “I cannot possibly believe I did this, oh well carry on”, I jumped back on the Landrover and set off back home to retrieve the important parts. On arriving back home I ran up the garden to the shed for the battery, grabbed the laptop and jumped back in the car as time was against me for capturing the pairing before they set below the local horizon about 6pm. It was not 4pm.
I arrived back at the field and quickly set about fitting together the mobile setup for the 2nd time!
Field with a view
This time I settled the tripod and mount up in quick time, slide the Mak180 with its imaging train into the Losmandy Versa plate and connected the Mac. I manually aligned on Jupiter which by this time I could see with my naked eye, synced the scope and started the imaging software. After a few back fourths I found Jupiter, however Saturn was nowhere to be seen. It soon became apparent that my field of view FoV indicator on Sky Safari 4 was not accurate and indeed both planes on this particular day would not fit in! So rather than waste the occasion I shot some view of Jupiter and then slewed to Saturn for the same.
Mak180 ready to slew
I then packed the setup away, but before heading off grabbed the Canon 6D with the 100-300mm lens and grabbed a few exposures. My first attempts were not good, having not used the camera for some time and forgetting how to set the correct exposure. After a while I grabbed a single good frame, over exposed to see the Galilean satellites.
Jupiter and Saturn near conjunction Canon 6D 100mmJupiter and Saturn near conjunction Canon 6D 300mmJupiter and Saturn near conjunction Canon 6D 300mm Cropped
I would attempt another go with the larger FoV Esprit 120 a few nights later.
So we started the decommissioning of IMT3, dome and all ready for the move to a new darker site location. The new incarnation once installed will be known as IMT3b. As part of the process the Esprit120 will be relocated to a separate pier mount in a RoR shed to be known as IMT3c.
Decided to have a quick look out before moving house, given it was supposed to be cloudy and there is a bit of a clear spell. I have decided to just take a look at a few objects. First up is the Cheeseburger Nebula NGC 7026.
Next up is IC63 which is a ghost nebula that Tim imaged the other night, I want to see what it looks like in my 12″ vs his 10″. The first thing I noticed was in the guider window that the reflection of the bright star Gamma Cas caused an interesting image.
Guiding reflectionGamma CasIC 63 Ghost Nebula 10min Ha
Next I am going to go after M110.
M110 5 minutes Luminance
I have now slewed to M32 just below.
M32 5 minutes Luminance
The last object of tonight and then off to bed so I can be up to help Bob concrete IMT4 tomorrow is NGC 508.
Imaging with GingerGeek for another exoplanet. This one starts its pre-transit at 23:55 and should just about be on the point at the meridian where we can perform a meridian flip and then image all night.
We like to make sure we have the right star field so actually having a photo from the exoclock website helps. Tonights candidate is the dimmer star to the left of this pair.
The star is a magnitude 10 star in Lacerta. Unfortunately despite the forecast it has just clouded over, here is what we would have been imaging.
So the evening started well, I had logged into IMT3, got the dome ready, TheSkyX/SGPro software was up and running, CMOS camera was cooled and I was already syncing on a bright star even though it was still twilight.
Dave and I had chatted the previous night and had settled on HAT-P-32b in the constellation of Andromeda. The reason was due to the target position in the sky, the time of rising and setting was before the rise of the sun so we could get a full ingress and egress and no meridian flip was required.
Then the gremlins started to play havoc with our efforts and I was having major issue with guiding to the point that I was going to give up as the issues were eating into the desired 1 hour egress monitoring time period. Dave joined the session to help resolve the issue and we managed to start imaging about 10 minutes before the start of the transit.
Dave had to go to bed due to work commitments but I was determined to get the full set of observation and run it through the HOPS analysis software. It was an uneventful night interspaced with music, movies and hot cups of tea.
Once I had transferred the data over the internet to my server, performed the analysis and sent the result to Dave it was 5:30am so I crawled into bed around 6am.
Bob, Dave and GingerGeek playing with the Tak 102 this evening and just image for 2 minutes on various targets.
Slewed to the Double Cluster first.
Focus position was 564 from the last time we used it a long time, it is now 578.
Took a 2 minute exposure
Double Cluster
Slewed to M75 the Little Dumbell. Needed to take a 5 min exposure to see
M76 Little Dumbell
Slewed to M34 Open Cluster.
M34 Open Cluster
Slewed to NGC 1023 a barred spiral galaxy. Took 5mins exposure at 22:12.
NGC 1023 Galaxy
GingerGeek went off to bed whilst Dave and Bob continued.
Slewed to NGC 1260 a lenticular galaxy in Perseus.
NGC 1260 Galaxy
Slewed to NGC 1545 an open cluster but it was behind the house.
Slewed to IC 1848 the Soul nebula.
IC 1848 Soul Nebula
Slewed to Heart nebula.
IC 1805 Heart Nebula
Slewed to IC 1831 an HII cloud.
IC 1831 Nebula
Slewed to IC 1795 nebula.
IC 1795 Nebula
We found at this point that some of the images were trailing at 2 minutes in the East so we started to use guiding.
Slewed to NGC 1245 open cluster. [not imaged]
Slewed to NGC 1220 open cluster. [not imaged]
Slewed to NGC 1528 open cluster at 23:37
NGC 1528
Dave went off to bed whilst Bob continued.
Slewed to IC 1795 Nebula.
IC 1795 Nebula
Slewed to IC 1831 Nebula.
IC 1831 Nebula
Bob then slewed back to a number of the objects as they had trailed including, IC 1805 Heart Nebula, IC1848 Soul Nebula, IC 1260, NGC 1023 barred spiral, M34, M76, Double Cluster
Session period 19:00 – 01:18, transit start ~23:06 and end ~02:37
Before I move house, we are going to try and grab another exoplanet or two or possibly three…..we’ll see. Tonight whilst it is currently clear and due to cloud over by 1am, we will go for HAT-P-6b that is on alert from Exoclock.
Exoclock Exoplanet on Alert tonight
The transit end time is after it is due to cloud over but we may be able to get the start of the transit and some useful data to possibly half way through. So I have opened the dome, started to cool the 12″ down and slewed to a magnitude 4.29 star in the vicinity of Andromeda called HIP 116631 also known as 17 Iota Andromedae in the Flamsteed catalogue so that I can slew and centre on the object when it gets dark.
HIP 116631
I’ve now manually centred the star due to the brightness of the sky still and synced in The Sky X
Manually centredHIP 116631 in relation to HAT-P-6b
I’m now waiting for a bit more darkness to perform the first focus run.
At 20:31 I performed a focus run on the mag 4.29 star with the red filter and got position 63007 @ HFR 5.2 and temperature at the focuser of 17.28℃.
Focus run on red filter
I have performed another solve and sync as I had left the scope running for a while without guiding and the star had moved slightly.
Solve and Sync on target
I have now taken a quick 20 second exposure of the target to confirm it was the right star as per the star chart from the Exoclock website and it was.
20s exposure of HAT-P-6b
I have started guiding on a nearby star with PHD2.
Guiding
HAT-P-6b rising from the East as can be seen in TSX.
HAT-P-6b rising in the East
So here is a 2 minute exposure of the target. I tried 60 second but given I am running Gain 10 Offset 10 the maximum pixel count for the centre of the star was 1,648 out of 65k. So a 2 minute exposure produces 9,488 which is still low but I will continue on the low side for now. 1 hour before the transit is in about 45 minutes so I will wait then start gathering data.
2 minute exposure of HAT-P-6b
So we’ve started and set to run for 5.5 hours, this means a a meridian flip in 4 hours time so I will need to stay up until 2am, perform the flip then head back to bed.
First image down
The clouds have started to roll in, however so far we have been lucky and our star and planet are just outside the bank of cloud …… but for how long?
Cloud
So it finally clouded over around 1am although the data for the past 20 minutes is suspect, so I hope we at least have the first half of the transit.
Session period 21:00 – 23:57, transit start ~21:16 and end ~00:05
Started with Lum autofocus at 21:17 but on changing to the Red filter the HFR rose to 8.5 so refocused on Red at 21:20, position 60789, HFR 3.97 at 21℃. The change in HFR was more likely the warm sky and seeing conditions.
Restarted imaging at 21:39 at new Gain 10 and Offset 10 with a 15 second exposure to get the exposure down well below the 65k max to around 35k. The target star is a magnitude +7.69 so the initial Gain 139 Offset 21 and even Gain 75 Offset 12 were too high even at 10 seconds exposure.
We started with no delay in between the exposures until the start of the transit, then decided due to the large amount of data (35GB) being collected we should put a delay in which we did of 60 seconds. In hindsight we should be placed a smaller delay period in 15-30 seconds to allow us to gather more data points for the transit period. We have emailed the ESA team to start a conversation on planning exposure/delay settings for transits.
We then finished was forced to finish before the projected transit was completed when the clouds rolled in, and took Dark, Bias and Flats frame at Gain 10, Offset 10 ready for the analysis software.
After reviewing the data and the monitoring graphs it is obvious that the less than desirable Sky Temperature showed it was not truly clear. Below is the effect of high haze and cloud passing across the sky during our observation session. It should be noted that we have not had sky with a reading <= -18℃ since mid July.
Not a truly clear sky during the transit
How much impact this has on the observation and measurements we will discuss with the Exoplanet team.
22:00 – 01:44 (GingerGeek came over and Bob was remote)
So the original plan was to perform another exoplanet observation and improve/learn from our previous experiences. However the weather did not look like it was going to be accommodating so we decided to change plans.
At first we planned to take a shot of Pluto and then go back to it later on in the month to see how far it had moved but it was low and below the the IMT3 visible horizon.
Next up was to continue imaging Messier objects for Dave’s Messier Marathon collection. We settled on M14 and had created and started an imaging sequence but again the clouds rolled in putting a stop once more to some constructive imaging.
So we then decided to track an asteroid for as long as we could before the clouds stopped us. Once Dave had loaded the asteroid database into TheSkyX we then choose one close by to the previously planned Exoplanet. The asteroid 85275 1994 LY (magnitude 14.01) was in the constellation of Ophiuchus.
We turned off PHD autoguiding and mount control in the SGPro control panel as we were going to be using mount tracking on the asteroid instead of sidereal.
Autofocus using Luminance filter – 60,389 position, HFR 5.0, Temp 24.94℃. We started at 22:46 and took a series of 30 second images until the cloud cover stopped us. Dave then used the Pixinsight blink script to stitch the resulting FITS->PNG images into a movie, then looped the short AVI, added titles and music in iMovie (best viewed full screen and in HD).
@ 19:00 Opened dome in order to cool the dome and scope down.
@ 21:00 GingerGeek arrives, wine is poured and we took 5 x darks, flats and bias for both the last run and tonight. The flats (red) were 3 seconds exposure to get 2/3 well depth required for this.
@ 21:44 Slewed to WASP-93b before we set about focusing on a nearby magnitude 5 star using the Red filter. Starting focus position was 58841@19.42℃.
@ 22:06 After failing to focus using the Red filter we resorted to using the Luminance filter to auto focus and achieved a excellent fit (focus position 61630, HFR 4.95 @20.83℃).
When we swapped back to the Red filter, SGPro then moved the filter offset to focuser position 60630. We slewed back to WASP-93b (GSC:3261:1703) and found a guide star just off centre of the star field with the exoplanet target.
Started to take exposures to find the brightest value of the centre pixel of the star and make sure it was 2/3 full well depth and thus 33,000 ADU (even though it is a 12-bit camera SGPro is set to 16-bit for ease of use. Eventually this was achieved at around 200 second exposure.
@ 22:51 Started imaging, 18.21℃ was measured at the focuser.
Frame and focus of starfieldTarget star for Exoplanet measurements Local conditions200s exposure of starfield
