Messier 69

Messier 69
M69 difoto dari Hubble Space Telescope; 3.5′
Kredit: NASA/STScI/WikiSky
Data pengamatan (J2000 epos)
KelasV[1]
Rasi bintangSagittarius
Asensio rekta 18j 31m 23.10d[2]
Deklinasi −32° 20′ 53.1″[2]
Jarak29.7 ribu tc
Magnitudo tampak (V)+8.31[3]
Dimensi tampak (V)9′.8
Karakteristik fisik
Radius42 tc[4]
Metalisitas = –0.78[5] dex
Perkiraan umur13.06  Miliar tahun[5]
Nama lainM69, NGC 6637, GCl 96[3]
Lihat pula: Gugus bola, Daftar gugus bola

Messier 69 (dikenal juga sebagai M69 atau NGC 6637) adalah gugus bola di rasi bintang Sagittarius. Objek ini ditemukan oleh Charles Messier pada 31 Agustus 1780, di malam yang sama saat ia menemukan M70. Pada saat itu, ia sedang mencari objek yang didiskripsikan oleh LaCaille pada tahun 1751-1752.

M69 berjarak sekitar 29.700 tahun cahaya dari bumi dan memiliki radius spasial 42 tahun cahaya.

Galeri

  • Sebagai gugus bola, M69 merupakan gugus yang paling kaya logam.[6]
    Sebagai gugus bola, M69 merupakan gugus yang paling kaya logam.[6]

Referensi

  1. ^ Shapley, Harlow; Sawyer, Helen B. (1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S. 
  2. ^ a b Goldsbury, Ryan; et al. (2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830–1837, arXiv:1008.2755 alt=Dapat diakses gratis, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830. 
  3. ^ a b "SIMBAD Astronomical Object Database". Results for NGC 6637. Diakses tanggal 2006-11-17. 
  4. ^ distance × sin( diameter_angle / 2 ) = 42 ly. radius
  5. ^ a b Forbes, Duncan A.; Bridges, Terry (2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society, 404 (3): 1203–1214, arXiv:1001.4289 alt=Dapat diakses gratis, Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x. 
  6. ^ "Cosmic riches". ESA/Hubble Picture of the Week. Diakses tanggal 3 October 2012. 

Pranala luar

Wikimedia Commons memiliki media mengenai Messier 69.

Koordinat: Peta langit 18h 31m 23.23s, −32° 20′ 52.7″

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