11 Ursae Minoris b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | 11 Ursae Minoris | |
| Constellation | Ursa Minor | |
| Right ascension | (α) | 15h 17m 05.89s[1] |
| Declination | (δ) | +71° 49′ 26.0″[1] |
| Apparent magnitude | (mV) | 5.024 |
| Distance | 398 ± 9[1] ly (122 ± 3[1] pc) | |
| Spectral type | K4III | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.54 ± 0.07 AU |
| Periastron | (q) | 1.42 AU |
| Apastron | (Q) | 1.66 AU |
| Eccentricity | (e) | 0.08 ± 0.03 |
| Orbital period | (P) | 516.22 ± 3.25 d (1.4133 ± 0.0089 y) |
| Argument of periastron |
(ω) | 117.63 ± 21.06° |
| Time of periastron | (T0) | 2452861.05 ± 2.06 JD |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 10.5 ± 2.47 MJ |
| Discovery information | ||
| Discovery date | August 12, 2009 | |
| Discoverer(s) | Döllinger et al. | |
| Discovery method | Radial velocity | |
| Discovery site | TLS | |
| Discovery status | Published | |
| Other designations | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
11 Ursae Minoris b is an extrasolar planet which orbits the K-type giant star 11 Ursae Minoris, located approximately 390 light years away in the constellation Ursa Minor. This planet has mass 10.5 MJ. However, since the mass is at lower limit and since inclination is not known, the actual mass is unknown. This planet may actually be a brown dwarf if a true mass is over 13 times that of Jupiter. This planet takes 17 months to orbit the star at the average distance of 1.54 AU in a circular orbit. This superjovian planet was detected by radial velocity method on August 12, 2009.[2]
References
- 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ↑ Döllinger, P.; et al. (2009). "Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518". Astronomy and Astrophysics 505 (3): 1311–1317. arXiv:0908.1753. Bibcode:2009A&A...505.1311D. doi:10.1051/0004-6361/200911702.
- Jean Schneider (2011). "Notes for Planet 11 Umi b". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
Coordinates: 
15h 17m 05.8886s, +71° 49′ 26.044″
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