Arp-Madore 1
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| Arp-Madore 1 | |
|---|---|
 Globular cluster Arp-Madore 1 | |
| Observation data (J2000.0 epoch) | |
| Constellation | Horologium |
| Right ascension | 03h 55m 02.70s[1] |
| Declination | −49° 36′ 52.0″[1] |
| Distance | 398,000 (122,000) |
| Apparent magnitude (V) | 15.07 |
| 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] |
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.[2] It is one of the most distant known globular clusters of the Milky Way galaxy's halo;[3][4] its distance gives it interest as a test case for gravitational theories.[5] AM 1 has a visual magnitude of 15.07.[6]
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,[7] after previous researchers at the European Southern Observatory had observed its existence but not its classification.[8]
