Hemisphere:  Northern  ·  Constellation: Serpens (Ser)
Getting plate-solving status, please wait...
Arp 101, 



    
        

            Gary Imm
Arp 101, 



    
        

            Gary Imm

Arp 101

Getting plate-solving status, please wait...
Arp 101, 



    
        

            Gary Imm
Arp 101, 



    
        

            Gary Imm

Arp 101

Imaging telescopes or lenses: Celestron EdgeHD 11

Imaging cameras: ZWO ASI 294 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: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Lum 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: Celestron OAG  ·  ZWO EFW 2″X7  ·  MoonLite Focuser for EdgeHD 11


Dates:March 18, 2021March 19, 2021

Frames:
Astrodon Blue 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2
Astrodon Green 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2
Astrodon Lum 31mm Gen2 I-Series: 60x120" (2h) (gain: 120.00) -20C bin 2x2
Astrodon Red 31mm Gen2 I-Series: 30x120" (1h) (gain: 120.00) -20C bin 2x2

Integration: 5h

Avg. Moon age: 5.05 days

Avg. Moon phase: 26.31%


Astrometry.net job: 4332952

RA center: 16h 4' 31"

DEC center: +14° 48' 37"

Pixel scale: 0.343 arcsec/pixel

Orientation: 11.659 degrees

Field radius: 0.127 degrees


Resolution: 2151x1588

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

Data source: Backyard

Description

This Astrobin Debut Object is a pair of galaxies located 215 million light years away in the constellation of Serpens at a declination of +15 degrees.

The magnitude 14.8 spiral galaxy at center is UGC10169. The slightly brighter magnitude 14.7 elliptical galaxy UGC 10164 is below. Each galaxy spans 0.8 arc-minutes in our apparent view, which corresponds to a diameter for each galaxy of 50,000 light years. A faint star stream bridge connects these 2 objects, but the most striking feature is the 200,000 light year long tidal star stream which extends out from the spiral galaxy, away from the elliptical in typical fashion.

This object was classified by Dr. Arp into the category of Spiral Galaxies with Elliptical Galaxy Companions on Arms. I think it is a stretch to say that the elliptical galaxy is on the "arm" of the spiral galaxy. Interestingly, Dr. Arp makes no mention of the star streams, nor is the classification based on them.

I like the faint dust band seen in the spiral galaxy.

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