11 Ursae Minoris
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 17m 05.89s |
| Declination | +71° 49′ 26.0″ |
| 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 mas/yr Dec.: 9.65 ± 0.21 mas/yr |
| Parallax (π) | 8.19 ± 0.19 mas |
| Distance | 398 ± 9 ly (122 ± 3 pc) |
| Absolute magnitude (MV) | –0.37[1] |
| Details | |
| Mass | 1.8 ± 0.25[1] M☉ |
| Radius | 24.08 ± 1.84[1] R☉ |
| Luminosity | 185 L☉ |
| Surface gravity (log g) | 1.60[1] cgs |
| Temperature | 4340 ± 70[1] K |
| Metallicity | 0.04 ± 0.04[1] |
| Age | 1.56 ± 0.54[1] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
11 Ursae Minoris (11 UMi, Iota Ursae Minoris) is the Flamsteed designation of a 5th magnitude K-type giant star located approximately 398 light years away[2] in the constellation Ursa Minor. This star is 1.8 times more massive, 24 times bigger, and 185 times more luminous than the Sun.
11 Ursae minoris is sometimes named Pherkard or Pherkad Minor, the later name to distinguish it from Pherkad (Major) which is γ Ursae minoris. It has also been designated as γ1 Ursae minoris, in which case the brighter Pherkad is called γ2 Ursae minoris, but these names are rarely used.[3]
11 Ursae minoris has a detected planet discovered in August 2009.[1]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥10.50 ± 2.47 MJ | 1.54 ± 0.07 | 516.22 ± 3.25 | 0.08 ± 0.03 | — | — |
See also
References
- 1 2 3 4 5 6 7 8 9 Döllinger, M.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. - ↑ 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
- ↑ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
External links
- Jean Schneider (2011). "Notes for star 11 UMi". Extrasolar Planets Encyclopaedia. Retrieved 30 September 2011.
Coordinates: 
15h 17m 05.8886s, +71° 49′ 26.044″
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