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EAA Monthly Observing Challenge - February 2021

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#1 garyhawkins

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Posted 30 January 2021 - 01:48 PM

Firstly, I really enjoyed all the great responses to the January Challenge.

 

For the February challenge, I thought it would be fun to set another themed challenge.  So the theme is, 'Messier Objects are to comets what BLANK are to Messier Objects.   

 

If you did not immediately guess, I am referring to Caldwell Objects.

 

The Caldwell Catalogue is an astronomical catalog of 109 bright star clusters, nebulae, and galaxies. The list was compiled by Sir Patrick Caldwell-Moore, better known as Patrick Moore, as a complement to the Messier Catalogue.  I've chosen eight of those currently well positioned for imaging.

 

Easy - The beautiful Open Cluster C10

 

C10_OC.jpg

 

Easy - The globular cluster C25

 

c25_gobular.jpg

 

Intermediate - the C30 galaxy

 

c30_galaxy.jpg

 

 


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#2 garyhawkins

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Posted 30 January 2021 - 01:53 PM

And here are the next three targets.

 

Intermediate - the fabulous C23 galaxy

 

c23_galaxy.jpg

 

Intermediate - the C2 planetary nebula.  This is the only image I cropped from the original.  All other images are approx. 27 x 27 arc mins FOV.

 

C2_PN.jpg

 

Intermediate - Another galaxy, C17

 

c17_galaxy.jpg


Edited by garyhawkins, 30 January 2021 - 01:59 PM.

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#3 garyhawkins

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Posted 30 January 2021 - 01:58 PM

And finally, my two difficult selections.  I marked these as difficult because a detailed image is going to take some imaging time.

 

Difficult - the impressive galaxy cluster, C24

 

c24_GC.jpg

 

Difficult - the galaxy C18, try and clearly resolve the dark area in the lower part of the core.

 

c18_galaxy.jpg

 

I hope you enjoy.

 

Gary

 


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#4 alphatripleplus

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Posted 31 January 2021 - 05:02 PM

Nice choices, Gary.  First thing I'm going to do is "convert" to NGC and Messier designations, as I haven't included the Caldwell catalog in my CdC catalog installation.



#5 nicknacknock

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Posted 01 February 2021 - 06:55 AM

By way of quick translation:

 

C10 - NGC 663

C25 - NGC 2419

C30 - NGC 7331

C23 - NGC 891

C2   - NGC 40

C17 - NGC 147

C24 - NGC 1275

C18 - NGC 185

 

Nice choices indeed, C23 / NGC 891 is a personal favorite!


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#6 GazingOli

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Posted 01 February 2021 - 08:42 AM

plus one for your choice, Gary. But the first challenge for me would have been the translation in NGC figures. Thanks Nick for doing the job. Plus one for NGC 891, especially with the C8 at f/10 - a real closeup :)

 

Hope to get better weather to be able to contribute to Feb challenge!

 

CS.Oli


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#7 garyhawkins

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Posted 01 February 2021 - 02:48 PM

Sorry guys, I did not make my equipment clear - I used a C8 SCT (with F6.3 focal reducer), 533MC and EQ6-R, in combination with SharpCap Pro, PHD2, and EQMOD.  30sec subs (using guiding), number of subs dependent on target.  In general between 2 - 10 mins of stacking per image - sorry I did not make a note for individual images.


Edited by garyhawkins, 01 February 2021 - 02:50 PM.

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#8 StarAlert

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Posted 01 February 2021 - 05:04 PM

Thanks!! These targets look like fun.

Just waiting for clear skies in SoCal. 


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#9 Shaney

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Posted 01 February 2021 - 07:30 PM

C2 (AKA NGC 40)

 

8 second exposures, 31 frames for a total of 248 seconds. Gain 300. Live stack capture from SharpCap Pro. C8, f/6.3 FR, AVX (unguided), QHY5III462C, Bortle 5.

Attached Thumbnails

  • B2CDB2CB-74A1-44E6-8852-2472508DE2D8.png

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#10 SanjeevJoshi

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Posted 01 February 2021 - 09:42 PM

Nice Gary!    NorCal also desperately waiting for a non-cloudy night, feels like it has been months :)

 

This set is very interesting, I am thinking of splitting between RASA 8 + 183 for the bigger ones, C10 native + 294 (no guiding) for the small ones.


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#11 nicknacknock

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Posted 02 February 2021 - 02:03 AM

And for those into SkySafari, here's the Observing List to import!

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#12 Stargazer3236

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Posted 02 February 2021 - 10:51 AM

Here are my entries for the EAA challenge.

 

Nexstar 8SE OTA, ASI294MC camera, ZEQ25 Mount, SharpCap 3.2 Pro and AT60ED, same camera and mount.

 

C23 - NGC 891, 1x1 Bin, 20% zoom, 380 Gain, 40 x 15s

stack-126frames-1008s_orig.jpg

 

C30 - NGC 7331 (bonus Stephan's Quintet), 2x2 bin, 350 gain, 30x8s

ngc7331 stephans quintet 350g 2x2b 30x8s.jpg

 

C2 - NGC 40, 1x1 bin, 350 gain, 48x20s

ngc40 1x1bin 350gain 48x20s 11min 75 zoom.png


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#13 Shaney

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Posted 04 February 2021 - 06:21 AM

I was too busy trying to look at a bunch of other objects last night, so I only got two for the challenge. As always, my equipment is as follows: C8, f/6.3 FR, AVX, unguided. Had a UV/ IR cut filter on last night. 
 

C23 (AKA NGC 891). 12 second images Gain 300; 49 frames stacked for a total of 588 seconds

C10 (AKA NGC 663) 8 second images Gain 300; 8 frames stacked for a total of 64 seconds

Attached Thumbnails

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#14 Jamez

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Posted 04 February 2021 - 11:21 AM

Here is a couple I got on Tuesday while testing the spacing of my 0.5x reducer. Hopefully I’ll get to try again at C23 with the C6/f3.6. That’s what I want to try out for the rest. 

 

These both were with a 72mm Apertura/0.5x reducer and ASI290MM. ASIAIR pro live capture and to my iPad mini. 1935x1096 gain 110

 

C10-NGC 663. 25@10sec. (I see also have ngc 659 & 654 tagging along) smile.gif

 

3EC63B59-57A7-4D6E-ADEC-E5C9773FB12A.jpeg

 

C23-NGC 891  25@30sec

 

A1B73119-D5DA-49C8-8F3D-6400394E143D.jpeg


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#15 alphatripleplus

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Posted 04 February 2021 - 12:30 PM

I tried the difficult targets (C24 and C16) last night while going after some other galaxies. Taken from my Bortle 4-ish backyard. Set-up for these 5 minute total exposures was my C8 @ f/3.7 (stacked twin f/6.3 reducers), ASI290MM mini at high gain, no filters, no binning, using ASILive vs 1.3.2:

 

C24/Perseus A/ NGC1275; (Celestron 8) 30 x 10s; 

 

Perseus A_NGC1275_f3.7_Light_Stack_30frames_10sec_RS_Bin1_7.8C_gain300_2021-02-03_195104.jpg

 

 

For comparison, here is C24 taken a couple of months ago with my little AT72EDII 72mm f/6 APO doublet, with the same camera and software, with a slightly longer (just under 6mins) exposure. More can be seen with the C8, but I'm surprised by how much the little refractor shows:

 

C24/Perseus A/ NGC1275; (AT72EDII) 35 x 10s;

 

Perseus_A_Light_Stack_35frames_f6.0_10sec_RS_Bin1_19.0C_gain300_2020-11-12_222259.jpg


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#16 alphatripleplus

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Posted 04 February 2021 - 12:34 PM

Back to the C8 set-up mentioned above  for this 5 minute capture of  C16 / NGC 185:

 

 

C16/NGC185; 30 x 10s;

 

NGC185_f3.7_Light_Stack_30frames_10sec_RS_Bin1_6.7C_gain300_2021-02-03_201815.jpg


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#17 Rickster

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Posted 04 February 2021 - 01:05 PM

Had a chance to get out 2 nights ago.  Conditions weren't great, so shots taken with the 16" scope weren't nearly as good as those posted previously.  The star of the show was the 6" imaging newt (AT6IN) that piggy backs the 16" scope.  I have recently gotten it to work at f3 thanks to precise spacing of a 0.7x focal reducer at 0.75X.  I was very happy with it's performance.  I let this shot run for 10 minutes, but it was pretty good after the first few frames.  The added frames mainly cleaned up the background.  I also got some nice shots of M31 and M45. 

 

NGC 663/ASI183MC Pro/darks/10sec subs/10min total exp/Sharpcap/saved as viewed

Attached Thumbnails

  • NGC663 29x10s AT6IN 0.75x FR no CC med.jpg

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#18 Jamez

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Posted 04 February 2021 - 03:58 PM

Back to the C8 set-up mentioned above  for this 5 minute capture of  C16 / NGC 185:

 

 

C16/NGC185; 30 x 10s;

 

attachicon.gifNGC185_f3.7_Light_Stack_30frames_10sec_RS_Bin1_6.7C_gain300_2021-02-03_201815.jpg

That’s Really nice! I can’t wait to give it a try with my C6. I also like your C24 taken with AT72. I tried for it Tuesday but decided I couldn’t resolve at my resolution. Still, a nice “fuzzy “. :)

 

fun stuff!


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#19 SanjeevJoshi

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Posted 04 February 2021 - 04:28 PM

C10  - NGC663 -- open cluster -- 16 mins
C25  - NGC2419 - globular cluster -- 6 mins
C30 -- NGC7331 -- galaxy -- 10 mins x 4 mins
C23 -- NGC891 -- Silver Sliver Galaxy 13 min x 3 mins
C2 -- NGC40 -- Bowtie Nebula 38 x 35 arc seconds
C17 -- NGC147 -- Spheroidal Galaxy 13 mins x 8 mins
C24 -- NGC1275 -- Perseus A galaxy 2 min x 2 mins
C18 -- NGC185 -- dwarf spheroidal galaxy 12 mins x 10 mins

 

 

In case this helps folks plan how they want to size the FoV and equipment.    I am going to try and do two passes on this.  First with Native C10 + ZWO 294 Pro (cooled) tonight.   When i get a chance to observe again, I will repeat 5 of the 8 with RASA 8 + ZWO 183 Pro (cooled).   

 

Not sure the framing will be ideal with the native F10 but only one way to learn:)



#20 Jamez

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Posted 05 February 2021 - 03:57 PM

Switched over to my C6/f6.3 reducer last night and ASI290MM. Air and stars were really turbulent and I almost put everything up after fussing with it for over a hour. But, just as I tried one more time and thing, everything looked like it might happen after all. Still not happy with bloated stars and some stretch in them. Condition or poor tracking? I started to shoot again without tracking and see, but was tired and cold. (And craving a cup of coffee!) smile.gif

 

C23-NGC891(again) C6/f6.3 reducer @ f/7.29 or 1093mm  5frames@60secs

 

C18-NGC185 same setup, frames, and time.

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  • 3B59D005-00A8-422C-9622-D1D8A3128E21.jpeg

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#21 mikenoname

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Posted 06 February 2021 - 02:32 AM

Did the Challenge live tonight. Great group Gary!

 

Enjoy.

 

https://www.youtube....h?v=fQBZ8jgS6v0


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#22 Rickster

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Posted 06 February 2021 - 10:29 PM

NGC 891

16in Newt, GSO CC, UV/IR filter, ASI183MM Pro, Sharpcap, darks, 58x10sec, bin 2, gain 200, resized, average seeing.

Click to enlarge.

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  • NGC 891 58x10s 16in CC UVIR DRK 183MM.png

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#23 nicknacknock

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Posted 07 February 2021 - 08:41 AM

Had some fun with 6 of the challenge objects, as the other two required waiting until much later  - [C30 - NGC 7331] and [C25 - NGC 2419]. First time I am participating in one of these challenges I think and thanks to Gary for the time and effort!

 

Evening on February 2nd, started with some darks and bias (no flats - not necessary with my setup), which I include here to show how noisy the ASI290MM is, yet it does calibrate well (wish it still came out in Pro version) and q quick PA in ASIAir Pro.

 

Dark.jpg

 

PA.jpg

 

Equipment used: Borg 60ED and GSO 0.6x reducer, for effective focal length of 216mm or f3.6, Baader Moon & SkyGlow filter, ASI 290MM and SW AZ GTi in EQ mode. All exposures are 10 x 10 sec at 300 Gain.



#24 nicknacknock

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Posted 07 February 2021 - 08:43 AM

C10 - NGC 663

 

NGC663.JPG

 

C23 - NGC 891 with satellite streaking 

 

NGC891 and Sat.JPG

 

Took another one of C23 - NGC 891 just so the satellite wouldn't win!

 

NGC891 no Sat.JPG


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#25 nicknacknock

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Posted 07 February 2021 - 08:44 AM

C2   - NGC 40

 

NGC40.JPG

 

C17 - NGC 147

 

NGC147.JPG

 

C18 - NGC 185

 

NGC185.JPG


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