Arp 7

Celestial hemisphere: Southern · Constellation: Hydra (Hya)

Arp 7

This Astrobin Debut Object is a face-on spiral galaxy located 240 million light years away in the constellation of Hydra at a declination of -17 degrees. This magnitude 14.5 galaxy spans 1 arc-minute in our apparent view, which corresponds to a diameter of 80,000 light years. It was classified by Dr. Arp into the category of Spiral Galaxies with a Split Arm.

There are 2 odd things here in addition to the galaxy. A blue star appears in the foreground immediately next to the core and obscures the galaxy somewhat. More interstingly, there appears to be a companion, unidentified by Dr. Arp, at the end of the bottom arm. This object could also be a star, but Arp 7 is slightly disturbed in this region and there appears to be a bit of star formation brightening the galaxy arm immediately to its left. If this is a companion, it is a small dwarf at about 10,000 light years in diameter.

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Description: Comparison to Original Arp Image

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Advanced success
Started	...
Astrometry.net job	4359804
PixInsight job	3I3FPC2KUKJI0CT2I2S0V3IJVO6WPFLT
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	08h50m20s.238
RA (top/left)	08h50m52s.424
RA (top/right)	08h49m47s.771
RA (bottom/right)	08h49m48s.230
RA (bottom/left)	08h50m52s.739

Dec (center)	-16°34′46″.25
Dec (top/left)	-16°29′33″.96
Dec (top/right)	-16°29′40″.50
Dec (bottom/right)	-16°39′58″.10
Dec (bottom/left)	-16°39′52″.10

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Arp 7

Arp 7

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Arp 7

Arp 7

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