Messier 4

M 4
Messier 4 difoto oleh teleskop Hubble
Kredit: NASA/STScI/WikiSky
Data pengamatan (J2000 epos)
KelasIX[1]
Rasi bintangScorpius
Asensio rekta 16j 23m 35.22d[2]
Deklinasi –26° 31′ 32.7″[2]
Jarak7.2 ktc
Magnitudo tampak (V)+7.12[3]
Dimensi tampak (V)36′.0
Karakteristik fisik
Massa6,7×104[4] M
Radius35 light years
Metalisitas = –1.07[5] dex
Perkiraan umur(12.2 ± 0.2) Gyr[6]
Fitur penting1°.3 west of Antares
Nama lainNGC 6121[3]
Lihat pula: Gugus bola, Daftar gugus bola

Messier 4 atau M4 (juga disebut NGC 6121) adalah sebuah gugus bola yang terletak di rasi bintang Scorpio. M4 ditemukan oleh Philippe Loys de Chéseaux tahun 1746 dan dikelompokkan oleh Charles Messier tahun 1764.

M4 terlihat sangat mencolok, dan termasuk salah satu dari gugus bola yang paling mudah untuk dinemukan, yang terletak hanya 1,3 derajat barat bintang Antares, dengan magnitudo semu 10,8.

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, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830.
  3. ^ a b "M 4 -- Globular Cluster". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2010-03-25.
  4. ^ Marks, Michael; Kroupa, Pavel (2010), "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, 406 (3): 2000–2012, Bibcode:2010MNRAS.406.2000M, doi:10.1111/j.1365-2966.2010.16813.x. Mass is from MPD on Table 1.
  5. ^ Kesalahan pengutipan: Tanda <ref> tidak sah; tidak ditemukan teks untuk ref bernama aaa490_2
  6. ^ Caputo, F.; Castellani, V.; Quarta, M. L. (1985). "Reddening, distance modulus and age of the globular cluster NGC 6121 (M4) from the properties of RR Lyrae variables". Astronomy and Astrophysics. 143 (1): 8–12. Bibcode:1985A&A...143....8C. Pemeliharaan CS1: Banyak nama: authors list (link)

Koordinat: Peta langit 16h 23m 35.41s, −26° 31′ 31.9″

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