Arp-Madore 1

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Arp-Madore 1
AM1 hst 06512 02 R814GB555.png
Globular cluster Arp-Madore 1
Credit: Fabian RRRR
Observation data (J2000.0 epoch)
Constellation Horologium (constellation)
Right ascension 03h 55m 02.70s[1]
Declination −49° 36′ 52.0″[1]
Distance 398,000 (122,000)
Apparent dimensions (V) 1.288 by 0.691 [1]
Physical characteristics
Other designations E1, AM 0353-094, C 0353-497, C 0354-498, AM 1, ESO 201-10, LEDA 14098, SGC 035336-4945.6[1]
See also: Globular cluster, List of globular clusters

Arp-Madore 1 is a globular cluster in the constellation Horologium 398,000 light-years away. It is one of the most distant known globular clusters of the Milky Way galaxy's halo;[2][3] its distance gives it interest as a test case for gravitational theories.[4] It is named after Halton Arp and Barry F. Madore, who identified it as a distant globular cluster in 1979, using the UK Schmidt Telescope,[5] after previous researchers at the European Southern Observatory had observed its existence but not its classification.[6]


  1. ^ a b c d "NAME E 1". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 29 January 2014. 
  2. ^ Aaronson, M.; Schommer, R. A.; Olszewski, E. W. (1984), "AM-1 : a very distant globular cluster", Astrophys. J. 276: 221–228, Bibcode:1984ApJ...276..221A, doi:10.1086/161605 .
  3. ^ Dotter, A.; Sarjedini, A.; Yang, S.-C. (2008), "Globular clusters in the outer galactic halo: AM-1 and Palomar 14", Astron. J. 136 (4): 1407–1414, arXiv:0807.1103, Bibcode:2008AJ....136.1407D, doi:10.1088/0004-6256/136/4/1407 .
  4. ^ Hilker, M. (2006), "Probable member stars of the gravitational theory-testing globular clusters AM 1, Pal 3 and Pal 14", Astron. Astrophys. 448: 171–180, arXiv:astro-ph/0510679, Bibcode:2006A&A...448..171H, doi:10.1051/0004-6361:20054327 .
  5. ^ Madore, B. F.; Arp, H. C. (1979), "Three new faint star clusters", Astrophys. J. 227: L103–L104, Bibcode:1979ApJ...227L.103M, doi:10.1086/182876 .
  6. ^ Holmberg, E. B.; Lauberts, A.; Schuster, H. E.; West, R. M. (1975), "The ESO/Uppsala survey of the ESO (B) atlas of the southern sky. III", Astron. Astrophys., Suppl.Ser. 22: 327–402, Bibcode:1975A&AS...22..327H .