NGC 772 - my first Arp galaxy (Arp 78) (Ian Dixon)

Celestial hemisphere: Northern · Constellation: Aries (Ari) · Contains: NGC 770 · NGC 772 · NGC 772#2 · PGC 1570709 · PGC 1573401 · PGC 1575486 · PGC 1575861 · PGC 1577099 · PGC 1577343 · PGC 1577957 · PGC 1579877 · PGC 1580734 · PGC 1582319 · PGC 1582580 · PGC 212884 · PGC 3090162 · PGC 7493 · PGC 7509 · SDSS J015834.87+185719.8 · SDSS J015835.73+184807.2 · SDSS J015837.85+190331.4 · SDSS J015840.09+184652.1 · SDSS J015843.55+190126.8 · SDSS J015845.99+185208.9 · SDSS J015846.59+185942.2 · SDSS J015847.27+191011.7 · SDSS J015850.60+185119.9 · SDSS J015851.63+190811.2 · SDSS J015851.90+185600.2 · SDSS J015902.90+184610.8 · And 28 more.

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NGC 772 - my first Arp galaxy (Arp 78)

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NGC 772 - my first Arp galaxy (Arp 78)

NGC 722

Here is an image of what will be my first capture of an Arp irregular galaxy. This was taken at Sandilands provincial park, located about 1 hours' drive east of my city.
The exposure is not too long, as it was my secondary target on the morning of October 3, and so the image data was collected around 3 am until about 6:00 am.

Technical notes - I had no difficulty with tracking (.5 to .6 RMS) but the main battery supplying the ASIair pro (raspberry Pi) was failing and caused some irregularities in voltage, which led to some messy subs. I wasn't sure whether to post this one, but que sera sera, ha ha.

Wiki says this about NGC 772 - : "Around 200,000 light years in diameter, NGC 772 is twice the size of the Milky Way Galaxy, and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed than the others arms. Halton Arp includes NGC 772 in his Atlas of Peculiar Galaxies as Arp 78, where it is described as a "Spiral galaxy with a small high-surface brightness companion"."

So, the take home message is that this big galaxy is being tugged upon by its neighbours, leading to some irregularities in the bigger galaxy.

This image was taken with my C8 and my ZWO 2600 mc camera. About 2.5 hours of integration time, processed in Pixinsight, stacked in APP.

Thanks for looking!

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Status	Advanced success
Started	...
Astrometry.net job	5065428
PixInsight job	YEVP3BMNIPRAIBP8RSYDXBO41LNZNXFE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h59m27s.102
RA (top/left)	01h59m41s.173
RA (top/right)	02h00m49s.178
RA (bottom/right)	01h59m12s.925
RA (bottom/left)	01h58m05s.960

Dec (center)	+19°00′49″.76
Dec (top/left)	+18°39′00″.71
Dec (top/right)	+19°11′19″.16
Dec (bottom/right)	+19°22′37″.50
Dec (bottom/left)	+18°50′17″.22

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NGC 772 - my first Arp galaxy (Arp 78)

NGC 772 - my first Arp galaxy (Arp 78)

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NGC 772 - my first Arp galaxy (Arp 78)

NGC 772 - my first Arp galaxy (Arp 78)

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