Hemisphere:  Northern  ·  Constellation: Auriga (Aur)  ·  Contains:  24 phi Aur  ·  IC 417  ·  IC417  ·  NGC 1931  ·  NGC1931  ·  Sh2-234  ·  Sh2-237  ·  The star φAur
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IC 417 and NGC 1931, 



    
        

            Gary Imm
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IC 417 and NGC 1931

Getting plate-solving status, please wait...
IC 417 and NGC 1931, 



    
        

            Gary Imm
Powered byPixInsight

IC 417 and NGC 1931

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 6200 MM Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

Software: Main Sequence Software Sequence Generator Pro  ·  Pixinsight  ·  Stark Labs PHD2 2.6.3

Filters: Chroma SII 3nm  ·  Chroma OIII 3nm  ·  Chroma Red 2" unmounted  ·  Chroma Ha 3nm  ·  Chroma Blue 2" unmounted  ·  Chroma Green 2" unmounted

Accessory: ZWO M68 OAG  ·  ZWO EFW 2″X7  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:Feb. 18, 2021Feb. 19, 2021Feb. 20, 2021Feb. 22, 2021

Frames:
Chroma Blue 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma Green 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma Ha 3nm: 24x300" (gain: 100.00) -20C bin 1x1
Chroma OIII 3nm: 24x300" (gain: 100.00) -20C bin 1x1
Chroma Red 2" unmounted: 30x120" (gain: 0.00) -20C bin 1x1
Chroma SII 3nm: 24x300" (gain: 100.00) -20C bin 1x1

Integration: 9.0 hours

Avg. Moon age: 7.81 days

Avg. Moon phase: 54.31%


Astrometry.net job: 4347287

RA center: 5h 29' 43"

DEC center: +34° 20' 10"

Pixel scale: 0.967 arcsec/pixel

Orientation: 2.783 degrees

Field radius: 1.051 degrees


Resolution: 6400x4515

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

These objects are emission nebulae and star clusters located 8000 light years away in the constellation of Auriga at a declination of +34 degrees. IC 417 is on the right and NGC 1931 is on the left, both lying in a rich star field.

Each object consists of an open star cluster energizing the gas nebula around it, with IC417 containing the star cluster Stock 8. Notice the intricate bright gas swirls and dark dust lanes caused by the stellar winds interacting with the hydrogen gas. It is interesting that the space between these two objects appears black and relatively free of gas and dust.

This pair is nicknamed the Spider and the Fly. As with many other DSOs, this nickname doesn’t appeal to me and takes away some of the magnificence of this pair, in my opinion. I find myself trying too hard to see the resemblance to an imagined figure instead of appreciating these beautiful objects for what they are.

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