4 Ursae Majoris b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | 4 Ursae Majoris | |
| Constellation | Ursa Major | |
| Right ascension | (α) | 08h 40m 12.8s |
| Declination | (δ) | +64° 19′ 40″ |
| Distance | 252 ly (77 pc) | |
| Spectral type | K1+IIIb | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.87 ± 0.04 AU |
| Eccentricity | (e) | 0.432 ± 0.024 |
| Orbital period | (P) | 269.3 ± 1.96 d |
| Argument of periastron |
(ω) | 23.81 ± 4.42° |
| Time of periastron | (T0) | 2,452,987.3936 ± 4.31 JD |
| Semi-amplitude | (K) | 215.6 ± 7.1 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 7.1 ± 1.6 MJ |
| Discovery information | ||
| Discovery date | 28 March 2007 | |
| Discoverer(s) | Doellinger et al. | |
| Discovery method | Doppler Spectroscopy | |
| Discovery status | Published | |
4 Ursae Majoris b (sometimes abbreviated 4 Uma b) is an extrasolar planet orbiting the star 4 Ursae Majoris, approximately 252 light-years away in the constellation of Ursa Major. This planet has a minimum mass over 7 times that of Jupiter and orbits at 0.87 AU from the star in an eccentric path.
References
- Döllinger; Hatzes, A. P.; Pasquini, L.; Guenther, E. W.; Hartmann, M.; Girardi, L.; Esposito, M.; et al. (2007). "Discovery of a planet around the K giant star 4 Ursae Majoris" (abstract). Astronomy and Astrophysics 472 (2): 649–652. arXiv:astro-ph/0703672. Bibcode:2007A&A...472..649D. doi:10.1051/0004-6361:20066987. (web preprint)
External links
- Jean Schneider (2011). "Notes for planet 4 Uma b". Extrasolar Planets Encyclopaedia. Retrieved 3 October 2011.
Coordinates: 
08h 40m 12.8s, +64° 19′ 40″
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