Celestial Atlas: NGC 25 Link for sharing this page on Facebook
IC 5350 - 5386 ← NGC Objects: NGC 1 - 49 → NGC 50 - 99
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Page last updated Aug 12, 2017

NGC 25 (= PGC 706)
Discovered (Oct 28, 1834) by John Herschel
A magnitude 13.0 lenticular galaxy (type E/SB0? pec) in Phoenix (RA 00 09 59.3, Dec -57 01 15)
Historical Identification: Per Dreyer, NGC 25 (= GC 11 = JH 2309, 1860 RA 00 02 57, NPD 147 48.2) is "very faint, small, round". The position precesses to RA 00 09 59.1, Dec -57 01 26, within 0.2 arcmin of the center of the galaxy listed above and well within its outline, so the identification is certain.
Physical Information: Based on a recessional velocity of 9465 km/sec (and H0 = 70 km/sec/Mpc), a straightforward calculation indicates that NGC 25 is about 440 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 425 million light years away at the time the light by which we see it was emitted, about 430 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 2.0 by 1.3 arcmin (from the images below), it is about 245 to 250 thousand light years across. The galaxy is the brightest member of Abell 2731, a rich cluster of galaxies with an average recessional velocity of 9350 km/sec and an apparent size of 35 arcmin (corresponding to a physical diameter for the cluster of more than 4 million light years).
DSS image of region near lenticular galaxy NGC 25, also showing NGC 28 and NGC 31
Above, a 12 arcmin wide DSS image centered on NGC 25, also showing NGC 28 and 31
Below, a 2.4 arcmin wide DSS image of the galaxy
DSS image of lenticular galaxy NGC 25
Below, a 12 arcmin wide DSS image centered on NGC 25, also showing NGC 28 and 31
Also shown are sixteen PGC objects
DSS image of region near lenticular galaxy NGC 25, also showing NGC 28 and NGC 31 and sixteen labeled PGC objects
Below, a 6 arcmin wide DSS image of the region between NGC 25 and NGC 31
Also shown are NGC 28 and PGC 394783, 394784, 394941, 394997, 395139 and 395226
DSS image of region between NGC 25 and NGC 31, also showing NGC 28
Below, a 6 arcmin wide DSS image showing objects to the southeast of NGC 25:
Galaxies labeled are PGC 735, 128415, 393982, 394013, 394155, 394279, 394289 and 394344
DSS image of the region to the southeast of lenticular galaxy NGC 25
Corwin lists the position for PGC 394783 of RA 00 10 09.8, Dec -57 01 39
for PGC 394344 of RA 00 10 04.3, Dec -57 04 09
for PGC 394784 as RA 00 10 28.6, Dec -57 01 39
for PGC 394941 as RA 00 10 18.6, Dec -57 00 42
and for PGC 395226 as RA 00 10 13.6, Dec -56 59 04

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