Celestial Atlas: NGC 28 Link for sharing this page on Facebook
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Page last updated Aug 12, 2017

NGC 28 (= PGC 730 = PGC 395160)
Discovered (Oct 28, 1834) by John Herschel
A magnitude 13.8 elliptical galaxy (type E1?) in Phoenix (RA 00 10 25.2, Dec -56 59 21)
Historical Identification: Per Dreyer, NGC 28 (= GC 13 = JH 2310, 1860 RA 00 03 25, NPD 147 46.4) is "extremely faint, the preceding (western) of 2", the other being NGC 31. The position precesses to RA 00 10 26.5, Dec -56 59 38, which is 0.4 arcmin southeast of the center of the galaxy listed above and within its outer glow, and it does precede NGC 31 (which lies just to its east), so the identification is certain. Unfortunately, as noted by Corwin, at one time some catalogs misidentified NGC 28 as NGC 31, and vice-versa; so the reader may still see their PGC designations reversed in some places.
Physical Information: Based on a recessional velocity of 9595 km/sec (and H0 = 70 km/sec/Mpc), a straightforward calculation indicates that NGC 28 is about 445 to 450 million light years away. However, for objects at such distances we should take into account the expansion of the Universe during the time it took their light to reach us. Doing that shows that the galaxy was about 430 million light years away at the time the light by which we see it was emitted, about 435 to 440 million years ago (the difference between the two numbers being due to the expansion of the intervening space during the light-travel time). Given that and its apparent size of about 0.95 by 0.9 arcmin (from the images below), it is about 120 thousand light years across. Unlike nearby NGC 25, which is listed as a member of Abell 2371, NGC 28 is not listed as such, and could be slightly behind the cluster. But the difference in their recessional velocities is well within the range of peculiar (non-Hubble-expansion) velocities for such clusters, so odds are that NGC 28 is also a member of the cluster. Regardless of its association with the cluster (or not), it and NGC 31's essentially identical recessional velocities suggest that they may be physical companions.
DSS image of region near spiral galaxy NGC 31, also showing NGC 25, NGC 28 and NGC 37
Above, a 12 arcmin wide DSS image centered on NGC 31, also showing NGC 25, 28 and 37
Below, a 1.4 arcmin wide DSS image of NGC 28
DSS image of elliptical galaxy NGC 28

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IC 5350 - 5386 ← NGC Objects: NGC 1 - 49 → NGC 50 - 99