Palomar 1
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| Palomar 1 | |
| 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 | - kg (- M ) |
| 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 of the Milky Way galaxy. First discovered discovered by George Ogden Abell in 1954 on the Palomar Survey Sky plates,[4] it was cataloged as a globular cluster. At 6.3 to 8 Gyr, it is a very young cluster compared when with 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]
[edit] References
- ^ a b c SIMBAD Astronomical Database. Results for Palomar 1. Retrieved on 2006-11-17.
- ^ a b c Rosenberg, A.; Saviane, I.; Piotto, G.; Aparicio, A.; Zaggia, S. R. (1998). "Palomar 1 - Another young Galactic halo globular cluster". Astronomical Journal 115: 648. doi:.
- ^ distance × sin( diameter_angle / 2 ) = 15 ly. radius
- ^ Abell, George O. (1955). "Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey". Publications of the Astronomical Society of the Pacific 67 (397): 258. doi:.
- ^ a b van den Bergh, Sidney; Mackey, A. D. (2004). "Globular clusters and the formation of the outer Galactic halo". Monthly Notices of the Royal Astronomical Society 354 (3): 713–719. doi:.
[edit] External links
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