Arp 78 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Aries (Ari) · Contains: NGC 770 · NGC 772 · PGC 1570709 · PGC 1573401 · PGC 1573896 · PGC 1575486 · PGC 1575861 · PGC 1577099 · PGC 1577343 · PGC 1577957 · PGC 1579877 · PGC 1580734 · PGC 1582319 · PGC 1582580 · PGC 212884 · PGC 7421 · PGC 7493 · PGC 7509

Arp 78

This object, nicknamed the Nautilus Galaxy, is a spiral galaxy (NGC 772) and companion (NGC 770) located 120 million light years away in the constellation of Aries at a declination of +19 degrees. Measuring from the outermost star stream extent, this galaxy spans 7 arc-minutes in our apparent view, which corresponds to an actual width of 250,000 light years. This is an unusually large width, twice that of the Milky Way.

The Nautilus galaxy is named after its resemblance to a nautilus seashell, which has an asymmetric spiral cross-sectional shape. The asymmetry is caused by interaction with the dwarf elliptical galaxy just to its lower right, whose gravitational forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed than the other arms. Note the bluish tint of this longer arm and the large knots of gas and dust along the arm. This arm displays the straight segments characteristic of Vorontsov-Velyaminov rows.

My favorite part of this image is the faint star streams, both encircling the main galaxy as well as running to and through the companion.

Many smaller background galaxies are also visible in this image, some nearby this pair. I could not determine if any of these small galaxies are in the same vicinity.

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Description: Comparison to Original Arp Image

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Images from the EdgeHD Series
ASI 6200 MM Pro
Cloudy Nights
Arp's Peculiar Galaxies
Schmidt-Cassegrain Telescope (SCT) Imagers
Texas Astronomy

Arp Catalog (Complete)
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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.

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Status	Advanced success
Started	...
Astrometry.net job	3834676
PixInsight job	MOCDLMHT5SDPQZQOI4WOSZGAEPEB271T
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	01h59m19s.734
RA (top/left)	02h00m41s.485
RA (top/right)	01h57m59s.999
RA (bottom/right)	01h57m58s.740
RA (bottom/left)	02h00m39s.509

Dec (center)	+19°00′29″.47
Dec (top/left)	+19°13′14″.60
Dec (top/right)	+19°13′51″.59
Dec (bottom/right)	+18°47′40″.82
Dec (bottom/left)	+18°47′04″.91

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