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Arp-Madore 1
Globular cluster Arp-Madore 1
Observation data (J2000.0 epoch)
Constellation	Horologium
Right ascension	03 55 02.70
Declination	−49° 36′ 52.0″
Distance	398,000 (122,000)
Apparent magnitude (V)	15.07
Apparent dimensions (V)	1.288 by 0.691 ′
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
See also: Globular cluster, List of globular clusters

Arp-Madore 1 (also known as AM 1) is a globular cluster visible in the constellation Horologium, located 123.3 kiloparsecs (402,000 light-years) away from Earth. It is one of the most distant known globular clusters of the Milky Way galaxy's halo; its distance gives it interest as a test case for gravitational theories. AM 1 has a visual magnitude of 15.07.

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, after previous researchers at the European Southern Observatory had observed its existence but not its classification.

See also

• Arp-Madore 2

References

1. ^ "NAME E 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 January 2014.
2. Vasiliev, Eugene (2019). "Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2". Monthly Notices of the Royal Astronomical Society. 484 (2): 2832–2850. arXiv:1807.09775. Bibcode:2019MNRAS.484.2832V. doi:10.1093/mnras/stz171.
3. 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.
4. 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, S2CID 119153331.
5. Hilker, M. (2006), "Probable member stars of the gravitational theory-testing globular clusters AM 1, Pal 3 and Pal 14", Astron. Astrophys., 448 (1): 171–180, arXiv:astro-ph/0510679, Bibcode:2006A&A...448..171H, doi:10.1051/0004-6361:20054327, S2CID 15832632.
6. "AM 1". people.smp.uq.edu.au. Retrieved 2024-05-10.
7. 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.
8. 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.

External links

• [REDACTED] Media related to Arp-Madore 1 at Wikimedia Commons

v t e Constellation of Horologium
List of stars in Horologium Horologium in Chinese astronomy
Stars	Bayer α β γ δ ζ η ι λ μ ν Variable R TW HD 27631 Other DENIS 0334-49 Gliese 146 GJ 1061
Exoplanets HD 27631 b ι Horologii b
Star clusters	NGC 1252 1261 Other Arp-Madore 1
Galaxies	NGC 1249 1433 1448 1483 1493 1510 1512 Other PKS 0226-559 SPT0418-47
Galaxy clusters Horologium Supercluster
Category

• Horologium (constellation)
• Globular clusters