Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820 (GalacticRAVE)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7769 · NGC 7770 · NGC 7771

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Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

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Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

NGC7769, NGC7770 and NGC 7771 form the gravitationally bound galaxy triplet Holmberg 820. The two larger galaxies were discovered by William Herschel (who else ...?) 240 years ago and the whole group is located at a distance of about 198 Mly. NGC7771 is an active barred disk galaxy, NGC 7769 an active non-barred disk and NGC 7770 and S0 galaxy, so quite a nice variety in one group.

Owing to its gravitational interactions, Holmberg 820 is a quite interesting object, as the three galaxies are enshrouded in the tidal debris of there interactions, and then the whole group is seen through a curtain of Galactic cirrus. To capture this is still high on my agenda, but the weather gods were not very generous the last three months (to put it mildly), and as this object is already well within the tree line from my place, I only can get some 1-1.5h per night (or basically 0 the last three months ...), and now it is too far west already for the season. So all together this image just combines about 6h of data, sufficient to see some tidal features (and a hint of Galactic cirrus), but not enough to do the object full justice. I will be back ...

Data were taken on 2023 Sep 19, 20, 23, 24, 26 and December 17.

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Schmidt-Cassegrain Telescope (SCT) Imagers
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ZWO ASI294MM Pro Images
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Status	Advanced success
Started	...
Astrometry.net job	9002668
PixInsight job	B8VJ1AOWJV3W9F4P9UV3GAMCBZ7JE3XC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h51m15s.294
RA (top/left)	23h52m04s.412
RA (top/right)	23h50m26s.228
RA (bottom/right)	23h50m26s.302
RA (bottom/left)	23h52m04s.291

Dec (center)	+20°07′46″.75
Dec (top/left)	+20°15′29″.88
Dec (top/right)	+20°15′30″.51
Dec (bottom/right)	+20°00′02″.39
Dec (bottom/left)	+20°00′01″.86

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Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

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Image Index:

Contribution Index (beta):

Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

Galaxy triplet NGC 7769, NGC 7770, and NGC 7771 a.k.a Holmberg 820

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