11 Ursae Minoris
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 17m 05.89s [1] |
| Declination | +71° 49′ 26.0″ [1] |
| Apparent magnitude (V) | 5.024 |
| Characteristics | |
| Spectral type | K4III |
| Apparent magnitude (B) | 6.415 |
| Apparent magnitude (J) | 2.876 |
| Apparent magnitude (H) | 2.091 |
| Apparent magnitude (K) | 1.939 |
| B−V color index | 1.391 |
| Astrometry | |
| Radial velocity (Rv) | –17.87 km/s |
| Proper motion (μ) | RA: 3.97 ± 0.23 [1] mas/yr Dec.: 9.65 ± 0.21 [1] mas/yr |
| Parallax (π) | 8.19 ± 0.19 mas[1] |
| Distance | 398 ± 9 ly (122 ± 3 pc) |
| Absolute magnitude (MV) | –0.363 |
| Details | |
| Mass | 1.8 ± 0.25 M☉ |
| Radius | 24.08 ± 1.84 R☉ |
| Luminosity | 185 L☉ |
| Surface gravity (log g) | 2.62 cgs |
| Temperature | 4340 ± 70 K |
| Metallicity | 0.04 ± 0.04 |
| Age | 1.56 ± 0.54 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
11 Ursae Minoris or 11 UMi is a 5th magnitude K-type giant star located approximately 398 light years away[1] in the constellation Ursa Minor. It is sometimes named Pherkard or Pherkad Minor, the later name to distinguish it from Pherkad (Major) which is Gamma Ursae Minoris. This star is 1.8 times more massive, 24 times bigger, and 185 times more luminous than our Sun. This star has a detected planet discovered in August 2009.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥11.20 ± 2.47 MJ | 1.54 ± 0.07 | 516.22 ± 3.25 | 0.08 ± 0.03 | — | — |
See also
References
- ^ a b c d e f van Leeuwen, F. (2007). "HIP 74793". Hipparcos, the New Reduction. Retrieved 2011-02-27.
- ^ a b Döllinger; 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.
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External links
- Jean Schneider (2011). "Notes for star 11 UMi". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
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