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Форум » Досуг » Космос » NGC 24
NGC 24
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NGC 24 (другие обозначения — ESO 472-16, MCG −4-1-18, UGCA 2, AM 0007-251, IRAS00073-2514, PGC 701) — спиральная галактика (Sc) в созвездии Скульптор.

Галактика была открыта английским астрономом Уильямом Гершелем 27 октября 1785.
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NGC 24 (= PGC 701)
Discovered (Oct 27, 1785) by William Herschel
Also observed (Sep 12, 1836) by John Herschel
A magnitude 11.6 spiral galaxy (type SA(s)c?) in Sculptor (RA 00 09 56.3, Dec -24 57 48)
Historical Identification: Per Dreyer, NGC 24 (= GC 10 = JH 2308 = WH III 461, 1860 RA 00 02 47, NPD 115 45.0) is "very faint, considerably large, much extended, gradually brighter middle". The position precesses to RA 00 09 54.8, Dec -24 58 14, only 0.5 arcmin southwest 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 555 km/sec, NGC 24 is about 25 million light years away, but for such distances peculiar (non-Hubble-redshift) velocities can significantly affect the accuracy of the estimate. Unfortunately, redshift-independent estimates range from as little as 3 million to as much as 35 million light years, inspiring even less confidence. However, the galaxy's apparent size of about 5.8 by 1.3 arcmin makes most sense if its distance is in the 25 million light year range, in which case it would be about 40 thousand light years across. It has been suggested that NGC 24 and 45 are a pair, as they have similar recessional velocities and if at similar distances their two degree separation corresponds to less than a million light years. The latter galaxy is more certainly about 25 million light years away, so if they really are a pair it would confirm the estimate made in this entry; but both galaxies' distances are sufficiently uncertain that the suggestion that they are a pair cannot inspire much confidence.
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