| Palomar 1 | |
|---|---|
Palomar 1 by Hubble Space Telescope; 3.3′ view Credit: NASA/STScI/WikiSky |
|
| Observation data (J2000 epoch) | |
| Class | XII |
| Constellation | Cepheus |
| Right ascension | 03h 33m 19.3s[1] |
| Declination | +79° 34′ 55″[1] |
| Distance | 37 ± 4 kly (11.2 ± 1.3 kpc[2]) |
| Apparent magnitude (V) | +13.18 |
| Apparent dimensions (V) | 2′.8 |
| Physical characteristics | |
| Mass | - M☉ (- kg) |
| Radius | 15 ly[3] |
| VHB | - |
| Estimated age | 6.3 to 8 Gyr[2] |
| Notable features | - |
| Other designations | LEDA 13165[1] |
| See also: Globular cluster, List of globular clusters | |
Palomar 1 is a globular cluster in the constellation Cepheus in the halo or Outer Arm(?) of the Milky Way galaxy. First discovered discovered by George O. Abell in 1954 on the Palomar Survey Sky plates,[4] it was catalogued as a globular cluster. At 6.3 to 8 Gyr, it is a very young cluster when compared to the other globular clusters in the Milky Way.[2] It is a relatively metal-rich globular with [Fe/H] = -0.60.[5] It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf companion globular Terzan 7, that is, it may have once been associated with a dwarf spheroidal galaxy that was later destroyed by tidal forces.[5]