Deep Sky – Page 2 – IMT3b Observatory

Viewing Report 19th August 2023

20:14 – 23:22

Gingergeek came over this evening with his travel rig to setup and test again before our trip. My travel setup is packed away so instead I will image with the 12″ this evening, the first time since May!

Guiding setup was an issue. I did not need to re-calibrate, however TSX kept guiding on a hot pixel. I realised after a long while this was because there were no bright guide stars in the FOV so used the rotator to find one then everything just worked.

Then had a bug with taking a set of images where the run kept using the blank filter. I added another row in TSX and deleted the original which solved the problem. Cloud came in just after 11pm to shut the dome up.

M15 5 min exposure

Viewing Report 24th& 25th June 2023

23:00 – 02:00

4 Epsilon Lyra Double Double star – 31mm I can see the double but not split the 2 stars; 13mm Ethos allowed me to split the doubles and the 10mm whilst slightly dimmer afforded me a slightly wider split

Cat’s Eye Planetary Nebula – 31mm very small not quite pinpoint of light visible nicely without a filter, OIII filter makes it slightly more apparent and Nebustar filter it looks marginally better; 13mm Ethos provided brighter nebula, again the filters provided a better view with the Nebustar being brightest; 10mm is the best view of them all with a definite oval shape East or West, right to left but now OIII produced the brightest and clearest view although it is pushing the seeing tonight

Turtle Planetary Nebula – Not seen

Rasalgethi Alpha Hercules Double Star – 10mm too much for tonight, could not get good focus but could easily split; 13mm Ethos the best view with brighter primary in yellow, very striking and smaller secondary blue; 31mm Nagler just splittable but both components look yellow.

Albireo Double Star – Bright large yellow primary and smaller but still bright blue star in the 13mm Ethos

M13 Hercules Globular Cluster – lovely in the 31mm Nagler; 13mm Ethos much brighter view and obviously larger with resolving more core stars; 10mm darker background so contrast better and even brighter core and stars more obvious with direct vision, including nice pair at 10pm on the cluster

M57 Ring Nebula – planned but not attempted

61 Cygni Double Star – planned but not attempted

NGC 6891 Open Cluster in Lyra – not seen in 31mm Nagler

NGC 6702 & NGC 6703 Galaxy pair – planned but not attempted

M56 Globular Cluster – 10mm dim resolvable , 13mm slightly brighter resolvable averted vision

NGC 6765 Planetary Nebula – planned not attempted

A really good night overall, the eyepieces lent to me from Bob are excellent and make the viewing more pleasurable being able to switch with my wider field of view ones.

Viewing Report 13th June 2023

23:00 – xx:xx

So the 22″ Dob is still out of action with the encoder cable needing repairing from a recent issue with snagging. I’ve ordered some RJ9 connectors to replace the one on the RA axis that is broken. So instead I thought I would open the dome and given the perfectly clear weather with no chance of rain, I would image Arp xxx with the 12″ that Bob Trevan had recently imaged with his 17″ and leave the scope running.

Due to the brightness of the sky when I started it was impossible to find a guide star, thus I have decided to perform almost lucky imaging of 1min exposures. Again given the background brightness this time of year, if I were to try lucky imaging of this faint object of say 1/10th of a second, it would not appear.

So I have set the scope running with 240 images to take in luminance and will come back in the morning and check the results.

Viewing Report 10th June 2023

22:34 – 01:00

Tonight was a visual night. GingerGeek and I used the 22″ Obsession Dobsonian to view some of the wonders of the late Spring sky.

We started with Venus with the aid of a Moon filter. Whilst Venus is bright and not too overwhelming in the eyepiece, the contrast afforded by the addition of this particular filter aids the clarity of the image as Venus sits on the bright backlight of the night sky this time of year. Venus is in a gibbous phase and you could clearly see a concave arch to the edge of Venus that was missing. The seeing was very steady and we were able to push to 179x with the 13mm Nagler.

Next up was Mars. Whilst it took a while for it to appear in the astronomically twilight sky, I swept the area North East of Venus and landed the target after a few moments. Mars was so very small compared with Venus, obviously red as seen without a filter in this case and slightly shifting in colours due to the seeing. By the time we had finished looking, Mars had appeared in the night sky.

Now the sky was getting darker we wanted to start on the deep sky objects. It became apparent very quickly there was a problem with my alignment. This was a problem I faced the last time out and the trouble is with he RA encoder. The RJ11 cable has been pulled and needs recrimping. So for tonight it was about star hoping only 🙂

We then went on to look at globulars M3, M92, planetary nebulae M57 the Ring nebula and M97 the Owl nebula. We tried to get M101 but the sky brightness would not allow it. We also looked at Mizar and Alcor that I could see from 11:30pm as a double, and we looked at Polaris and it’s double star companion SAO 305 through the scope.

The planetary nebulae were seen through an OIII filter and Tele Vue Nebustar filter. I thought the view was slightly clearer through the Nebustar filter, maybe due to the slightly wider bandwidth which includes H-Beta. The Ring nebula was very crisp and I thought I could discern the central star which is 12th magnitude. Our friend Bob was kind enough to lend me a set of eyepieces he recently acquired. The Tele Vue 10mm Radian eyepiece gives 230x through which we could see the central white dwarf.

Whilst looking at the globular clusters we pushed the magnification to 288x with the 8mm Tele Vue Radian. Both this eyepiece and the 10mm gave fantastic views with the globulars sparking with pinpricks of lights from the 1,000s of Suns!

M101 SuperNova (27th-28th May)

DSW invited me over to the IMT3 observatory for an imaging weekend to image M101 and the recent supernova2023ixf discovery. DSW was using the 12inch RDK and I decided to put the FSQ85 on the Pegasus NYX-101 to test out the setup ready for our Tenerife trip to Mount Teide.

I ran the QHY268C at high gain mode, gain 56, offset 30 and -20℃. I finally managed to cure the noise banding I was experiencing on the QHY268C but using a fully shielded high quality USB3 short length cable that I run from direct to a Pegasus UPBv2 that sits on top of the scope.

Although it’s mid summer and the Moon was bright and approaching full the phase, the sky conditions on the first night appeared to be okay at first sight. Before processing I decided to check on data quality via the blink module in PixInsight it was obvious that they were a lot of unusable subs due to high cloud and using them would have ruined the quality of any resulting stacked image.

Running the data stack of raw images through the PixInsight Subframe Selector to analyse the PSF SNR versus noise it clearly shows that I could only use 7 frames (35 minutes) didn’t drop below 0.08 from night one whilst all the data from night two should go straight into the bin along with most of night one 🙁

Given I don’t have enough data to do the end result justice due to my poor PixInsight skills I decided to invert the images – I really should subscribe to Adam Block Studios (Shout out !)

Inverted image of M101, supernova 2023ixf and surrounding area

Running the AnnotateImage Script labels the various galaxies in the image which I enjoy looking up to see which type they are, magnitude and how far away they are.

Annotated FoV for area around M101, supernova is not labelled

Zooming in to M101 to see the Supernova better, it is located to the right of NGC5461 and indicated by the two arrows.

M101 with SN2023ixf indicated by the arrows

Light Curve

The AAVSO have a light curve plotted from measurements submitted by amateurs, just enter “SN 2023ixf” and submit here. It was still around 11th magnitude on 18th June but there does appear to be a slight decline in the brightness curve.

Viewing Report 27th May 2023

22:14 – 03:00

Takahashi FSQ85, QHY268C and Pegasus NYX-101

GingerGeek came round again tonight for another full night of imaging.

Focus position at 19,506 for Luminance at 22:30 hours.

Started with M100 a galaxy in Coma Berenices. LRGB at 300s sub frames as I have not imaged this galaxy before. However I found this was too close to the Moon so I will revise another night. So I moved onto M10 for RGB, as I have luminance data from Spring 2020 I took 4-6 of RGB as M10 was then too low as it passed the Meridian.

Unfortunately due to the Moon and on reflection looking at the luminance data from April none of the data is of significant quality to be able to use, so I will have to reshoot.

Viewing Report 26th May 2023 (M101)

22:47 – 03:15

M101 for me this evening to try and get there RGB data in one night. GingerGeek has come round to test out his travel setup, he has a Takahashi FSQ85, QHY268C and the Pegasus NYX-101 harmonic mount.

Focused at 20,105 on Luminance so RGB will be 21,105

1 x 300s Red

Taking 2 minute exposures for each colour at -25℃. I then realised 5 minutes is so much better. So at 1:30am I then started exposing at 5 minutes with the plan to combine both data sets. The SkyX worked brilliantly as can be seen below, looking after the guiding and image capture.

The main challenge I had early on was the the dome shutting unexpectedly. I will attempt to find out why over the next few months. The camera noise continues to be an issue but less so tonight so I think it may be USB related, again I will troubleshoot and check there cable lengths.

GingerGeek had a productive night troubleshooting a multitude of problems on his untested travel kit and was pleased with the results including taking his first image of a supernova in M101.

Viewing Report 20th May 2023

22:27 – 03:12

Imaging from IMT3b this evening using the 12″ CDK. Decided to test and see what my image scale would look like compared to Bob’s 17″ CDK. Bob had recently taken an image of Hickson 68 and in particular NGC 5353, a spiral galaxy in Canes Ventatici.

So I’m out and all is clear and calm, temperature is around 12℃ after a pleasantly warm day of 21℃. I am now shooting 1 minutes exposures as did Bob and I will take 70 of these. Of course to be comparable I would need at least 4 times the amount give the light grasp from Bob’s 17″.

By 1.13am I had finished 70 x 60s exposures for NGC 5353 including flats and darks. Then I slewed to M101 to start collecting RGB frames, however I needed to get the camera rotated back to the right position. Firstly PixInsight’s plate solving script had gone from my install since the recent update so I need to fix that. So instead I used image link in TSX. Using the following process I managed to correct my FoV frame and then sync the rotator to the current view. I then opened the M101 image from the 21st April and used that as a reference to then rotate the rotator to align.

Take a photo and Image Link it
Rotate the FoV Indicator to match the position angle and synch it
Unlink the image
Open the original M101 photo
Rotate the FoV Indicator to match the linked photo and tell the rotator to rotate

Finally got the imaging run on M101 started at 3am for RGB taking 2min subs. I remembered to move the focus position out by 1,000. So I went from luminance at 19,329 to Red 20,329

Need more flats and darks for M101 later tonight.

Viewing Report 21st April 2023

21:48 – 05:47

Out imaging M101 in Luminance again to gather more data before I move onto RGB. I already have some Ha which to be honest is probably not all that useful due to poor signal.

5 mins exposure of M101 uncalibrated

So admittedly the biggest challenge tonight was not having sorted automating a meridian flip, falling asleep and waking up after 1 hour to find I had 50 mins of star trails as the mount had come to a perfectly safe rest and stopped tracking. A quick manual flip and I was back in action

Not tracking at the meridian

Another problem I had, especially on the West side of the meridian was a jump every now and then in the autoguider causing the resulting image to have a jump in it. I eventually suspected the star brightness of the guid star being the issue so I increased the exposure from 7s to 12s. This resulted in an increase in the Relative Star Brightness as shown on the Autoguider Graph increasing from 40 to over 100. It also seems to have resolved the issue.

Relative Star Brightness increased with increased exposure 7s to 12s

The last problem I had tonight was the camera was set to GAIN 139 OFFSET 10 rather than OFFSET 21. This seems to reset in TSX every time I reconnect the camera. So from now on I will make it part of my startup process to set the OFFSET correctly. The impact is slightly dimmer pixels as it is not adding the additional 11 to each one and thus the times for Flats I have need to be increased.

In total tonight I managed to grab around 4 hours 15 mins of good data once I removed problematic frames so 51 x 300s subs. I also took calibration frames, darks, flats and flat darks.

Viewing Report 17th April 2023

21:29 – 00:53

M101

Luminance 19 x 300s

M101 5 x 300s Luminance no calibration

Viewing report 8th & 9th March 2023 Tenerife Los Gigantes Villa

Between 9pm and 12:30am both nights

A week with the family in Tenerife afforded me the opportunity to test out for the 2nd time this year the Skywatcher 100 Esprit on the AM5 harmonic mount with the ASIAIR in control and the ASI2600MC with a new Antlia Triband RGB Ultra filter.

Over the period of the week I picked 2 nights when I wanted to observe. Because of the clement environment of Tenerife and the Canaries and unlike the UK, you can decide when to go out and image as almost all nights are clear, the weather warm, around 22 deg Celsius and the bed not that far away from the pool. Given when we were on holiday which was decided around other activities, the Moon phase was Full.

The one problem with renting a villa is when the owners will not pinpoint where on a map it is. There is normally a reason. In this case it was because of the proximity of the local sports buildings. A swimming pool to the front of the villa including a floodlit pitch and 2 more flood lit pitches to the left and right of the villa at the rear.

So yes it was bright, very bright, as can be seen on the villa party wall.

So given all that light pollution I was then pleasantly surprised how well the final image came out of the singular target I chose. NGC 2244, the Rosette Nebula.

I exposed for some 75 x 300s over the 2 nights. All the images were on the West side of the Meridian to make it easier without a flip.

I found stacking 75 images instead of just the first night of 30+ images gave a much smoother background and nebula, much less noise and easier to work with the data.

So not a bad photo for Full Moon and 3 flood lit pitches. I look forward to testing out the kit at the top of the mountain later in the year under New Moon dark skies.

Viewing report & Filter Comparison 8th March 10pm 2023

I wanted to compare 2 filters this evening as I have recently purchased the new Antlia Triband RGB Ultra filter. The original filter I had for the one shot colour was the ZWO Duo-Band filter.

As can be seen above the difference without a filter is quite dramatic (Top – No Filter, Middle – Antlia Triband RGB Ultra, Bottom – ZWO Duo-Band). There is more broadband light captured. The red nebula is less apparent and the background sky is much brighter.

The above image from the running man nebula, NGC 1977 demonstrates that without a filter a reflection nebula comes through best (Left – No Filter, Middle – Antlia Triband RGB Ultra, Right – ZWO Duo-Band). The ZWO filter gives a more green image over that of the Antila, which in itself reduces the reflection nebula but does start to pick up some of the red emission nebula within the Running Man.

The inverted background above gives a sense of the reduction in star luminance that is allowed through without a filter.

This image shows the background with the details of the readout from each of the pixel across the colour channels. Here you get a sense of the green seen in the ZWO filter is less the extra green coming through, moreover the lack of blue being allowed through. Without a filter the background sky is swamped with all colour channels.

With no filter the full effect can be seen above, much brighter background, nebula less colourful and less detailed.

With the Antlia filter above, the final single image I personally find is much more pleasing.

Finally with the ZWO filter you can see quite clearly the green effect.

So in summary I would say the ZWO filter is better than no filter except when imaging reflection nebula, however the best filter is the Antlia filter when paired with my one shot colour ZWO ASI2600MC camera.

Below is a random drawing of a scientist with a Tak laser beam.

Viewing report 24th February 10pm 2023

22:00 – 01:00

Tonight was all about further testing of the travel scope which is now the Esprit 100 refractor. M78 would be the target along with a quick peak at Comet C2022 E3.

Moving to the Comet and having a quick look I could see how green it was and the the stars were very sharp.

I then slewed to M78 and took a single 600s exposure, however I remembered I had the ZWO Duo-Based filter left in so the reflection nebula is not very apparent, whilst part of the Orion molecular cloud can be seen clearly to the upper right.

So overall a good evening testing the equipment and ready for another trip to Tenerife in March.

Imaging Report 15th-16th December 2022

As it was a work night and Dave was working I was imaging from the back garden and not the dark site. I started late in the evening and had issues sorting out the autofocus in NINA which meant I was even later than I had planned.

Using the OptoLong L-Pro filter and the native camera driver (not ASCOM) :

The target was decided by Dave as M31 (Andromeda Galaxy), I decided on 120 second exposures at -15℃, gain 0 and offset 30 (Photographic Mode). I finally started to capture data at 19:55 when M31 had already transited 45 minutes earlier.

M31 single sub (stretched) via NINA Imaging Session

I believe the dark shadow to the left is the QHY OAG prism, I may have to reduce it’s depth in the light path or rotate it 45 degrees so it sits on the long horizontal axis.

Once M31 had reached approximately 50 degrees altitude and was starting to set in the West my guiding started going awry especially in RA. I put this done to either balance issues or cable snagging so that’s something I need to look at in the future.

After shutting down earlier than I thought due to the guiding issue and the pending rising Moon I decided to do my darks, flats and dark flats. However my Pegasus Flatmaster refused to connect to NINA so I decided to fix and complete this task on a different day.

I only managed to capture 62 subs which totals just over 2 hours. I was hoping to get at least 6 hrs for a single session and something approaching > 12 hours which means I will need several more nights to capture my required amount of data for M31.

Not a great first outing but given I hadn’t imaged in ages this was expected. I can honestly say that although a OSC coupled with the new harmonic mounts such as the ZWO AM5/Pegasus Nyx are very convenient as part of a lightweight holiday travel setup. OSC also is easier processing but still I can say I’m not a total fan due to the loss of high frequency data, high HFR focus issues and in the case of the QHY268C the noise banding issue which although appears to be removed by darks etc still is unnerving.

Update (17/12/2022)

Have resolved my Flatmaster 120 panel issues but I feel I’m better off with a fully controllable fixed panel instead of a manual panel so I will look into that.

My Darks, Flats and Dark Flats are now done (25 of each) all performed at -15℃ to match this session temperatures but there is still not enough actual data to start processing.

Viewing Report 10th December 2022

23:00 – 00:20

So it’s about time I tried to find a replacement for SGPro, given the continued problems with it, it’s less than intuitive design and find something that does not cause friction in my desire to capture more photons from the distant universe! So after looking at NINA briefly earlier this year, I have gone for it this evening to see if I can indeed capture some images.

The problem that set me back once before with NINA was the lack of connection to the FLI focuser. I just simply got an ASCOM error (I really dislike ASCOM). So after some educated guessing I got it connected. Instead of connecting to the FLI focuser directly I actually went through ASCOM which bizarrely cured the error.

With that done. I could now run autofocus, and only the 2nd time in my life this astronomy programme focused on the first go. The only other piece of software that good is the ZWO ASIAIR that I really enjoy because it just works.

I have now connected NINA to PHD2, also to TSX and left TSX to control the dome. I may change this later, however it works just fine and has not caused any problems. The only reason may be to further automate the dome for closing and reporting on status if that is a feature of NINA, something to look into later.

Managed to take 5 or 6 Ha images of 600s this evening before the cloud rolled in. I can use the flats from yesterday. A good evening testing given conditions including the almost full but waining Moon.

Viewing Report 9th December 2022

19:01 – 03:05

Dome open on the freezing night, currently -2℃, and I have fixed the dome slipping for the 2nd time this week, this time putting new grip tape on a hole that had appeared due to the wheel slipping.

Started out imaging M76 which is near the Zenith whilst we watch Harry Potter in the warmth of the lounge buy a roaring fire. After 11 frames of 600s in OIII I have stopped and slewed through Meridian flip and now started on Ha as I have 84 frames of OIII already……

So at 1:15pm I had 23 x 600s Ha on M76. Whilst I need much more and then RGB frames, I want to go to bed and M76 will set shortly to a less than desirable altitude. So I took my flats, darks and flats darks and closed the dome up for the night as the Moon was still fairly full.

Viewing Report 8th December 2022

19:43 – 22:29

For a long while I have had the observatory turned off. All the computers, mount and dome, due to the energy crisis. However, tonight I wanted to make sure the dome still worked and I could image an object so I turned most things back on. There are some things I can do without, including the ASC.

I managed to fight with SGPro to get it to image and slewed to the Soul Nebula. In particular a star galled GSC 4048:1298 which is near a nice Ha region. I found a guide star through the off axis guider and set about imaging 600s subs. I took around 7 before the dome closed due to the moon being so bright the weather statin reported it being too light to image! So the dome closed. I did reopen and get some more data but now it is too late and I need some sleep for work.

I took flats, darks and flat darks.

Viewing Report 27th August 2022

21:49 – 23:32

Not entirely clear this Bank Holiday weekend, however good enough to test out the newly cleaned ASI1600MM with the new desiccant. I received the desiccant from Zoltan at Astronomy365 and cooked in the microwave for 2 mins on medium power before letting cool down and then placing in the camera. I managed to get most of the dust off the sensor, however it is very difficult.

At 00:15 I started to image M72 the globular cluster low down in Aquarius using LRGB 60s on Luminance and 300s on RGB. Note that I will need all new flats today due to the cleaning of the camera. I will leave the observatory running overnight and head off to bed.

Update from this morning, looks like the observatory run all night without a problem and however I believe the object went behind the trees in the distance that have grown after about 10 luminance frame 🙁 I took flats this morning and will take darks tonight.

Flats – Done

Darks – Not done

Viewing Report 20th August 2022

20:36 – 00:39

Back for a second night tonight. M26 is the target again to get some more quality data on the open cluster.

I will set the camera back to Gain 10 Offset 10 to allow for maximum exposure with minimum star saturation. I have had some cloud this evening so far which caused the dome to close. Now it has cleared I have reopened.

Focus run at 22:04 gave 15,965 on Luminance. I left the observatory running at around 12:30am and headed off for bed.

I noticed in the morning the dome had closed and the imaging stopped 40 mins before completion. There may have been clouds so I will check the rest of the frames later. I should have then refocused again later as it drifted again. I reviewed the LRGB frames however the guiding was not brilliant and some of the frames have trailed. I took Flats and Darks in the morning for completeness.

Viewing Report 19th August 2022

22:43 – 03:06

First tonight was to take some 300s darks for the other night for NGC 6765. I only needed 5 of them so spent the first half hour on that.

Then looking at what I could do before the Moon comes up around 11:30pm, I have a couple Messier objects on my list to go after. M26 is the initial one to tackle. I will try a low exposure for luminance and longer on RGB.

Initial focus position is 17,782 for Luminance. I then had to take a new set of darks for the Lodestar camera. I am not sure why these no longer match.

@ 23:53 I started imaging M26 LRGB, L = 60s, RGB = 300s

Focus run at 1:06am 16,879 for Luminance

Finished imaging just before 2am when the object was too low and the bottom of the dome slit was in the way. I then went on to grab flats and darks.