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Contains:  IC 1795, NGC 896
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NGC 896, 





    
        

            George Simon
NGC 896

NGC 896

Technical card

Imaging telescope or lens:TPO/GSO 6" f/6 Imaging Newtonian

Imaging camera:Canon 1100D

Mount:Sky-Watcher EQ-6 Pro

Guiding telescope or lens:ORION Mini guide 50mm

Guiding camera:ORION SSAG

Software:PHD2.6.4dev6GIMP 2.9.6Backyard EOS 3.1.16Nebulosity 3.3.3Startools 1.3.5.289

Accessory:Baader MPCC

Resolution: 1305x825

Dates:Jan. 9, 2018

Frames: 154x60" ISO800

Integration: 2.6 hours

Darks: ~16

Flats: ~50

Bias: ~50

Avg. Moon age: 22.68 days

Avg. Moon phase: 44.39%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 17.98

Temperature: 2.00

Astrometry.net job: 1913856

RA center: 36.439 degrees

DEC center: 62.075 degrees

Pixel scale: 3.482 arcsec/pixel

Orientation: 9.102 degrees

Field radius: 0.747 degrees

Locations: Home Observatory, Chesnee, SC, United States

Data source: Backyard

Description

Stock camera.

Generally, my red-zone skies (average sky brightness 19.0 mag/arc sec2) permit me to shoot 90 sec. subs. Thus, I was perplexed when my first 90-sec. test shot of NGC 896, the Fishhead Nebula, this past Tuesday produced a histogram that was just shy of the midway point on the x-axis. Subsequent test shots of 80 sec. and 75 sec. were still overexposed. I had to go all the way down to 60 sec. to get the histogram to the one-third point. Since the skies that night had average to even better than average transparency, I was confused about what was going on. As I pondered the matter, it finally hit me that the 10-inch snow cover in my area was brightening the sky, and not insignificantly at that! In fact, the sky brightness turned out to be 18 mag/ arc sec2, a full magnitude brighter than normal. Since emission nebulae are a challenge for my set-up even under the best conditions--my Canon 1100D is not modded--I knew that 60 sec. subs were likely not going to pick up much of my target. Still, I hoped that the the three and a half hours' worth of integration time that I was intending to accumulate that night might produce something that was presentable. Unfortunately, an unexpected deck of middle clouds rolled in at the two-and-a-half hour mark and shut me down for the night. Glutton for punishment that I am, I decided to make the best that I could out of the data that I had.

Comments

Author

georgemsimon
George Simon
License: None (All rights reserved)
740
Like

Revisions

  • NGC 896, 





    
        

            George Simon
    Original
  • NGC 896, 





    
        

            George Simon
    B
  • NGC 896, 





    
        

            George Simon
    C
  • NGC 896, 





    
        

            George Simon
    D
  • Final
    NGC 896, 





    
        

            George Simon
    E

B

Reprocessed from scratch.

C

I brightened the dimmer portions of the nebula a bit.

D

In an attempt to get as much I could out of this admittedly sub-par data, I went back to the beginning and used a different stacking method. The result appears improved, with better color, and with more of the dimmer nebulosity surrounding the Fish Head revealed.

E

Inreased the saturation a bit.

Sky plot

Sky plot

Histogram

NGC 896, 





    
        

            George Simon

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