Arp 309 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Cetus (Cet) · Contains: NGC 942 · NGC 943

Arp 309

This Astrobin Debut Object, also known as NGC 942 and NGC 943, is a pair of galaxies located 200 million light years away in the constellation of Cetus at a declination of -11 degrees. In his Arp catalog, Dr. Arp classified this object into the category of Double Galaxies.

The larger galaxy is NGC 943. This magnitude 14 spiral spans 1.5 arc-minutes in our apparent view, which corresponds to a diameter of 90,000 light years. The smaller galaxy is the magnitude 15 spiral NGC 942, which is 60,000 light years in diameter.

The galactic halo at first to me suggested interaction, but on closer inspection I think the 2 galaxies are mainly overlapping and not interacting much. It looks to me like the smaller galaxy is in front, based on the loss of detail in the lower part of NGC 943. I think they are interacting a bit based upon the wobbly dust lane of NGC 943, but for the most part both galaxy disks remain undisturbed.

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Status	Advanced success
Started	...
Astrometry.net job	4969935
PixInsight job	4BQN4ZWN1P10NTX332L0XW2CK1G9LXDK
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h29m10s.212
RA (top/left)	02h28m49s.612
RA (top/right)	02h28m48s.594
RA (bottom/right)	02h29m30s.827
RA (bottom/left)	02h29m31s.816

Dec (center)	-10°49′54″.50
Dec (top/left)	-10°43′47″.57
Dec (top/right)	-10°55′47″.48
Dec (bottom/right)	-10°56′00″.46
Dec (bottom/left)	-10°44′00″.47

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