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NGC7635 - Five targets for the price of one!

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#1 Dave53N

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Posted 18 August 2019 - 10:06 PM

The region around NGC7635, the Bubble Nebula, has a number of other interesting targets, such as NGC7638, Dreyer’s Object, which is an active star forming region containing  what is reported to be the largest protostar so far observed at 300x the size of the solar system (!) with a contracting core of 85-115 solar masses. (http://astronomydraw...citing.html?m=1).

Also in the same frame is the open cluster M52; HII region Sh2-159; dark nebula LDN1231 and irruptive variable star V628 Cas classified as a Herbig Be star which has strong outflow of matter.

 

The clouds cleared long enough the other night for me to collect 2h 36m of data.

 

Equipment:
Scope: ES ED102-FCD100 at f7 (714mm) with Starfield  field flattener
Camera: ASI294MC-Pro
Mount: CEM60
Guide scope: Starfield 60mm with ASI120mm-S
Filter: IDAS NB1 nebular contrast enhancer.

Guiding error ~0.6 arc sec total RMS

Moon 97%, SQM-LU readings 19.25 - 18.63

Exposures, all at gain 200 and -15C:
Lights: 78 x 120s; Darks: 40 x 120s; Flats: 7s with LED pad; Dark flats: 7s.

Processing software: DSS, APP, GIMP 2.10 and RawTherapee (for noise reduction)

I would be very happy to hear your comments and criticisms.

 

NGC7635_Bubble_Rot_NB1_2019-08-16_120sec_ED102_ASII294MC_200G_-15C_156m_78L_40D_40F_40DF_AveSigKap-lpc-cbg-balrgb_starcal-3_sigma_St RT5.jpg

 

 


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#2 Dave53N

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Posted 18 August 2019 - 10:08 PM

Here is an annotated version:

 

NGC7635_Bubble_Rot_NB1_2019-08-16_120sec_ED102_ASII294MC_200G_-15C_156m_78L_40D_40F_40DF_AveSigKap-lpc-cbg-balrgb_starcal-3_sigma_St RT5.jpg


Edited by Dave53N, 19 August 2019 - 12:26 AM.

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#3 ZL4PLM

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Posted 18 August 2019 - 11:01 PM

sad can't see it from NZ :(  nice image!



#4 Traveler

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Posted 18 August 2019 - 11:14 PM

You got the LMC and the SMC etc for example...grin.gif 

 

@Dave: nice picture!


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#5 Astrola72

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Posted 18 August 2019 - 11:34 PM

Nice image but that's NGC7538, not NGC7638.

 

Joe



#6 elmiko

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Posted 18 August 2019 - 11:45 PM

Really nice image! That's a wide field of view using that camera!

Mike



#7 Dave53N

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Posted 19 August 2019 - 12:27 AM

Thanks for your comment and for catching my typo Joe, I've edited the image

 

Dave



#8 Dave53N

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Posted 19 August 2019 - 12:36 AM

Thanks ZL4PLM, Traveler and Mike.

 

Yes, the FOV with this scope (fl 714mm) and camera is better suited to many nebulae, compared to my old VC200L and 0.71x reducer (fl 1280mm).

 

Dave


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#9 schmeah

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Posted 19 August 2019 - 08:29 AM

Great field! But you missed one ...

 

https://pbase.com/ds...image/166005925

 

Derek


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#10 jgraham

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Posted 19 August 2019 - 01:18 PM

Nicely done! I love this field. Thanks for labeling Sh2-159; I have noted this in my images and I never could figure out how it should be designated. I like how you we able to process this region without blowing out M52.

 

Wonderful!



#11 Dave53N

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Posted 19 August 2019 - 04:42 PM

Derek, thanks for pointing out planetary nebula KJPN8, it only just shows up in the image - I've updated the annotated version to show it.

 

-----

 

John, thanks for your comments - the dual narrowband filter seems to helps with keeping the nebulae and stars in balance.

 

NGC7635_Bubble_Rot_NB1_2019-08-16_120sec_ED102_ASII294MC_200G_-15C_156m_78L_40D_40F_40DF_AveSigKap-lpc-cbg-balrgb_starcal-3_sigma_St RT5 ann.jpg


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#12 Jim Thommes

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Posted 21 August 2019 - 12:50 PM

Excellent image. I think you got more than you thought for the 'price of one'.  Glad you picked up the planetary, but I think you have some other LDN's and a partial of Sharpless 2-161. Fabulous wide field.



#13 Dave53N

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Posted 21 August 2019 - 02:56 PM

Many thanks Jim. Yes, I realize I hadn't labelled every target visible in the image.

 

Dave




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