Hemisphere:  Northern  ·  Constellation: Auriga (Aur)  ·  Contains:  AE Aur  ·  Flaming Star Nebula  ·  IC 405  ·  PGC 168936  ·  PGC 17099  ·  Sh2-229
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IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
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IC 405 Flaming Star Nebula (New acquisition, QHY268c)

Getting plate-solving status, please wait...
IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
Powered byPixInsight

IC 405 Flaming Star Nebula (New acquisition, QHY268c)

Acquisition details

Dates:
March 12, 2021
Frames:
23×300(1h 55′)
Integration:
1h 55′
Avg. Moon age:
28.65 days
Avg. Moon phase:
0.88%

RA center: 05h15m06s.61

DEC center: +34°1528.6

Pixel scale: 1.254 arcsec/pixel

Orientation: 52.196 degrees

Field radius: 1.214 degrees

More info:Open 

Resolution: 4061x5669

File size: 11.9 MB

Data source: Backyard

Description

This is a revisit from one of my first ventures into astrophotography a couple of years ago. Though not first light with my new camera, it is my second serious effort to get an image, with the intent of getting the image for the image's sake with this camera. (Well, I have recorded a few others, but this one was the easiest and fastest to process.) If anyone is interested, they can go back and look at my first effort at this target. For both, I was somewhat starved for subs. But this is a fairly bright nebula and I think I got enough and not likely to revisit this anytime soon. Simply a casualty of the weather where I live.

Named for the bright star surrounded by reflection nebulae and more broadly the fainter Ha emission nebula, to me this actually looks more like a well cooked cocktail shrimp! I tried to process this in real color (using photometric color calibration). In my subs, the bluish reflection nebula filaments appear to be largely detached from and float above the red emission nebula and close to the illuminating star. This makes sense, I guess. However, the dust in the reflection nebula is very diffuse and transparent, allowing significant red light to pass through from behind. This yields a rather greyish appearance, which has purple overtones. My stretching (both red and blue) makes these fields of dust look purple. Otherwise, the features of this nebula are much more subdued than many of the other more popular nebulae. To help viewers see that structure better, I have employed a decent amount of star reduction here. I used primarily the Adam Bloch technique. Often star reduction is more strongly employed, but instead I include a starless representation as a revision that I think favors this nebula.

So far I am happy with the new camera. I include still another revision showing the bright star artifacts seen with the old camera and the new. The old yielded the not uncommon circular halo with the same imaging train. The new one has little or no halo, however you can see a lot of diffraction spikes. This is not the camera (at least I hope not!). Rather, upon storage of my RASA over the last long 5 months, apparently a small spider got busy just behind the corrector plate. These are invisible unless viewed at night with a headlamp. In any case, a new take on how a spider can add diffraction spikes to bright stars! I will be posting on Cloudy Nights or someother to see if anyone has any ideas as to how to remove those damn webs. Help!

Additional acquisition info: The QHY268c has multiple acquisition/read modes. For this, I used Mode 3 @ gain 0 with an offset of 8. I am learning that offset 8 is likely bare bones and other targets that I have used this offset with, but with shorter exposures, are giving me headaches with periodic noise in my background. Looks like fine horizontal raster lines from an old analog tv. I am trying to figure out why my bias will not remove that, but... No such issues with this target"s 300s exposures. Lots to learn.

Comments

Revisions

  • IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
    Original
  • IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
    B
  • Final
    IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
    C
  • IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle
    D

B

Description: Starless version. Credit Starnet. No other refinement other than launching.

Uploaded: ...

C

Description: The "real" original

Uploaded: ...

D

Description: A single sub from this data to illustrate the nature of the data. Again, as I have been for quite some time, I am dealing with some tilt in the telescope itself. Also, with the new camera, I do have some pincushion aberration that suggests suboptimal backfocus. If I can ever string together more than one night of clear weather I will hopefully address these issues. But its tough to diddle with that vs. actually image something interesting.

Uploaded: ...

Sky plot

Sky plot

Histogram

IC 405 Flaming Star Nebula  (New acquisition, QHY268c), 



    
        

            Alan Brunelle