NGC 884

NGC 884
Ha i Xi, NGC 869 (desno) i NGC 884 (lijevo). Sjever je prema gore.
Otkriće
Položaj
Epoha J2000
Zviježđe Perzej
Udaljenost 7.6 kly[1] ly  (2.3 kpc[1] pc)
Rektascenzija 02h 22.0m[2]
Deklinacija +57° 08′[2]
Izgled na našem nebu
Prividna magnituda 6.1[2]
Prividne dimenzije (V) 30′
Stvarne osobine objekta
Ostalo
Posebne značajke -
Druge oznake Collinder 25,[2] Melotte 14,[2]

Raab 10,[2] OCl 353,[2]
χ Per Cluster,[2] χ Persei[2]

NGC 884 je otvoreni skup u zviježđu Perzeja, udaljen oko 7600 ly[1]. Starost skupa se procjenjuje na oko 12.5 milijuna godina [1]. Skup je istočniji u Dvostrukom skupu, kojeg čini zajedno sa skupom NGC 869.

Oba skupa se fizički nalaze u asocijaciji Perzej OB1, a međusobno su udaljeni “samo” nekoliko stotina svjetlosnih godina.

Skupove je prvi opisao Hiparh, no s obzirom na to da se lako vide golim okom, zasigurno su poznati od pamtivijeka.

Astronomska promatranja

Vidi Ha i Xi.

Vanjske veze

Reference

  1. 1,0 1,1 1,2 1,3 N.V. Kharchenko, A.E. Piskunov, S. Röser, E. Schilbach, and R.-D. Scholz, 2005, "Astrophysical Parameters of Galactic Open Clusters", Astronomy and Astrophysics, Volume 438, Issue 3, August 2005, pp.1163-1173
  2. 2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 „SIMBAD Astronomical Database”. Results for NGC 884. Pristupljeno 22. 12. 2006. 

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