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NGC 21

NGC 21
NGC 21
NGC 21/NGC 29
Kredit: 2MASS
Data pengamatan (J 2000.0 epos)
Rasi bintangAndromeda
Asensio rekta 00j 10m 46.9d[1]
Deklinasi +33° 21′ 10″[1]
Pergeseran merah0.015911[1]
Kecepatan radial helio4770 ± 4 km/s[1]
Jarak234 ± 29 Mtc
(71.7 ± 8.9 Mpc)[2]
Magnitudo semu (V)+12,8 mag[3]
Ciri-ciri
JenisSAB(s)bc:[1]
Ukuran semu (V)1,2′ × 0,59′[4]
Penamaan lain
NGC 21,[3] UGC 100,[3] PGC 767,[3] Z 499.66,[3] MCG +5-1-48,[3] IRAS 00082+3304,[3] GC 14,[3] H 2.853,[3] h 6,[3] NGC 29,[3] KAZ 19,[3] Swift II.[3]

NGC 21 (juga dikenal sebagai NGC 29) adalah galaksi spiral di rasi bintang Andromeda.

Galaksi NGC 21 ditemukan pada tanggal 26 November 1790 oleh astronom kelahiran Jerman-Inggris William Herschel. Dan Lewis A. Swift mengamati galaksi ini pada tanggal 20 September 1885. Pengamatan ganda pada awalnya tidak diketahui, dan sebagai akibatnya adalah bahwa galaksi ini terdaftar sebagai dua nomor katalog: NGC 21 (Swift) dan NGC 29 (Herschel).

Referensi

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  1. ^ a b c d e "NASA/IPAC Extragalactic Database". Results for NGC 0021. Diakses tanggal 2010-05-03. 
  2. ^ "Distance Results for NGC 0021". NASA/IPAC Extragalactic Database. Diakses tanggal 2010-05-03. 
  3. ^ a b c d e f g h i j k l m "Revised NGC Data for NGC 21". Students for the Exploration and Development of Space. Diakses tanggal 2010-05-03. 
  4. ^ "SIMBAD query result". SIMBAD. Diakses tanggal 2010-05-03. 

Pranala luar

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  • Wikisky image dari NGC 29

Koordinat: Peta langit Kesalahan ekspresi: Operator / tak terduga&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=1&show_galaxies=1&img_source=IMG_all 0h 10m 47.0s, +33° 21′ 0″


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NGC 21
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