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IC 5350 - 5386 ← NGC Objects: NGC 1 - 49 → NGC 50 - 99
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Page last updated Aug 12, 2017

NGC 23 (= PGC 698)
Discovered (Sep 10, 1784) by William Herschel
A magnitude 12.0 spiral galaxy (type SB(rs)ab?) in Pegasus (RA 00 09 53.4, Dec +25 55 26)
Historical Identification: Per Dreyer, NGC 23 (= GC 9 = WH III 147, 1860 RA 00 02 41, NPD 64 51.0) is "3 small stars plus nebulosity". The position precesses to RA 00 09 53.7, Dec +25 55 46, only 0.3 arcmin north 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 4565 km/sec (and H0 = 70 km/sec/Mpc), NGC 23 is about 210 to 215 million light years distant, in good agreement with redshift-independent distance estimates of 175 to 210 million light years. Given that and its apparent size of about 3.1 by 1.65 arcmin (from the images below), it is about 190 to 195 thousand light years across. NGC 23 is listed as a starburst galaxy.
SDSS image of region near spiral galaxy NGC 23
Above, a 12 arcmin wide SDSS image centered on NGC 23
Below, a 3.5 arcmin wide SDSS image of the galaxy
SDSS image of spiral galaxy NGC 23
Below, a 14 arcsec wide HST image of the active core of the galaxy (Image Credit Hubble Legacy Archive)
HST image of active core of spiral galaxy NGC 23
Below, a 12 arcmin wide SDSS image centered on NGC 23, also showing PGC 1754508 and 1757813
A distant cluster of galaxies lies to the southeast, but its faint members are not listed in most catalogs
SDSS image of region near spiral galaxy NGC 23

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