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Форум » Досуг » Космос » NGC 48
NGC 48
ingvarr
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Дата: 11.09.2016, 13:39:06 | Сообщение № 1
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NGC 48 (другие обозначения — UGC 133, MCG 8-1-31, ZWG 549.27, IRAS00113+4757, PGC 929) — галактика в созвездии Андромеда.

Этот объект входит в число перечисленных в оригинальной редакции «Нового общего каталога». Эта галактика была открыта 7 сентября 1885 года американским астрономом Льюисом Свифтом.
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ingvarr
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Дата: 11.09.2016, 13:40:19 | Сообщение № 2
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NGC 48 (= PGC 929)
Discovered (Sep 7, 1885) by Lewis Swift
Also observed (Oct 13, 1890) by Guillaume Bigourdan
Also observed by Edward Barnard
A magnitude 13.6 spiral galaxy (type SBbc? pec) in Andromeda (RA 00 14 02.2, Dec +48 14 06)
Historical Identification: Per Dreyer, NGC 48 (Swift list II (#6), 1860 RA 00 07 27, NPD 42 31.8) is "most extremely faint, pretty large, round, very difficult". The second Index Catalog lists a corrected RA (per Bigourdan and Barnard) of 00 06 42; using that and the original NPD the position precesses to RA 00 14 01.6, Dec +48 14 56, only about 0.8 arcmin north of the center of the galaxy listed above and close to its northern end, so the identification is certain.
Physical Information: Despite the certainty of the identification of NGC 48, there must be conflicting identifications somewhere, because it has two listed recessional velocity values (1775 and 5250 km/sec), which obviously belong to completely different objects. As a result, whether it is about 85 million light years away (corresponding to the lower recessional velocity) or about 245 million light years away (corresponding to the higher recessional velocity) is unknown. There are a number of redshift-independent distance estimates, but they are equally confused, ranging from 85 to 200 million light years, so the distance of the galaxy is essentially unknown. Given the apparent size of 1.3 by 0.6 arcmin, if the distance is near the lower values it is about 30 thousand light years across; but if the distance is near the higher values the galaxy is about 90 thousand light years across. My guess, based on the appearance of the galaxy, is that it is more likely to be at the larger distance and have the larger size. But until sometime does new measurements, taking care to make sure they are for the correct object, the actual distance and size of NGC 48 will remain a mystery.

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