Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Helix galaxy  ·  NGC 2685
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NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan
NGC 2685 Helix Galaxy (Arp 336)
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NGC 2685 Helix Galaxy (Arp 336)

Getting plate-solving status, please wait...
NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan
NGC 2685 Helix Galaxy (Arp 336)
Powered byPixInsight

NGC 2685 Helix Galaxy (Arp 336)

Technical card

Imaging telescopes or lenses: TPO/GSO RC8

Imaging cameras: QHYCCD 183

Mounts: SkyWatcher EQ6-R Pro

Guiding telescopes or lenses: Orion Thin Off-Axis Guider (TOAG)

Guiding cameras: ZWO 290MM Mini

Focal reducers: Astro-Physics CCDT67 - 0.67x Reducer

Filters: Optolong Blue 1.25"  ·  Optolong Green 1.25"  ·  Optolong Red 1.25"  ·  QHYCCD QHYCFW3S - 3rd Generation Small Thin 7 position Filter Wheel  ·  Chroma Lo-Glow LP filter


Dates:Nov. 23, 2019Nov. 25, 2019Nov. 26, 2019Dec. 8, 2019Dec. 12, 2019Jan. 20, 2020Jan. 21, 2020Jan. 22, 2020Jan. 29, 2020Jan. 30, 2020Feb. 15, 2020Feb. 18, 2020Feb. 20, 2020Feb. 21, 2020Feb. 22, 2020Feb. 23, 2020Feb. 24, 2020

Frames:
Chroma Lo-Glow LP filter: 674x120" (22h 28') (gain: 10.00)
Optolong Blue 1.25": 344x120" (11h 28') (gain: 10.00)
Optolong Green 1.25": 318x120" (10h 36') (gain: 10.00)
Optolong Red 1.25": 342x120" (11h 24') (gain: 10.00)

Integration: 55h 56'

Avg. Moon age: 21.01 days

Avg. Moon phase: 22.20%

Bortle Dark-Sky Scale: 7.50


Basic astrometry details

Astrometry.net job: 3279574

RA center: 8h 55' 36"

DEC center: +58° 43' 55"

Pixel scale: 0.427 arcsec/pixel

Orientation: 90.581 degrees

Field radius: 0.272 degrees


Resolution: 3834x2505

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard

Description

I only intended on giving this one 30 hours, but my test stacks were just looking terrible, so I kept adding more and more data. It did improve things, but I just don't think I can get what I was hoping for with an 8" scope under bright skies - it's really at the cusp of what I can do under this light pollution and I don't intend on doing a galaxy this dim in the future (at least from home). This was one of my toughest images and definitely my toughest broadband image to date.

One thing I do want to call your attention to is the galaxy cluster at the bottom right of the uncropped image. I tried doing a plate solve with PI and didn't get anything on them. I seriously wonder how far away those galaxies are. EDIT: Gary and Johny did the research for me and the answer is 2.5 to 3 BILLION light years away with Johny identifying two at 2.743 and 2.707 billion light years away.

Comments

Revisions

  • NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan
    Original
  • NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan
    B
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            Chris Sullivan
    D
  • Final
    NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan
    E

B

Description: Crop

Uploaded: ...

D

Description: A little less stretching and a little more noise reduction.

Uploaded: ...

E

Description: Crop

Uploaded: ...

Sky plot

Sky plot

Histogram

NGC 2685 Helix Galaxy (Arp 336), 



    
        

            Chris Sullivan