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NGC 7331

NGC 7331
NGC 7331 dipotret oleh TeleskopPhillips 24-inci RCOS di Mount Lemmon SkyCenter[1]
Data pengamatan (J2000 epos)
Rasi bintangPegasus
Asensio rekta 22j 37m 04.1d[2]
Deklinasi +34° 24′ 56″[2]
Pergeseran merah816 ± 1 km/s[2]
Jarak398 ± 33 Mly (122 ± 10 Mpc) [3]
Magnitudo semu (V)10.4[2]
Ciri-ciri
JenisSA(s)b[2]
Ukuran120,000 ly (diameter)
Ukuran semu (V)10.5′ × 3.7′[2]
Penamaan lain
UGC 12113, PGC 69327,[2] Caldwell 30

NGC 7331, atau Caldwell 30, adalah sebuah galaksi spiral nirbatang (unbarred spiral galaxy) sekitar 40 juta tahun cahaya (12 Mpc) dari Bumi, di rasi bintang Pegasus. Galaksi ini ditemukan oleh William Herschel pada 1784.[4] NGC 7331 merupakan galaksi paling terang pada daerah pengelompokan visual galaksi yaitu Grup NGC 7331. Anggota lainnya pada grup ini, NGC 7335, 7336, 7337 and 7340, terletak jauh di latar belakang, dengan jarak sekitar 300–350 juta tahun cahaya.[5]

Referensi

  1. ^ Block, Adam (1 September 2009). "NGC 7331". Mt. Lemmon Skycenter. University of Arizona. Diakses tanggal 9 August 2024. 
  2. ^ a b c d e f g Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama ned
  3. ^ Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; et al. (February 2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129 alt=Dapat diakses gratis. Bibcode:2003ApJ...583..712J. doi:10.1086/345430. 
  4. ^ The NGC/IC Project Diarsipkan 2011-02-28 di Wayback Machine. : NGC Discoverers List by Bob Erdmann.
  5. ^ "Spiral Galaxy NGC 7331, Galaxy Group (NGC 7335, 7336, 7337)". 

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