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 | K4 III[2] |
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: ±0.23 3.97[1] mas/yr Dec.: ±0.21 9.65[1] mas/yr |
Parallax (π) | 8.19 ± 0.19[1] mas |
Distance | 398 ± 9 ly (122 ± 3 pc) |
Absolute magnitude (MV) | –0.37[3] |
Details | |
Mass | ±0.20 2.04[2] M☉ |
Radius | +0.71 −0.73 28.20[2] R☉ |
Luminosity | ±17.7 258.8[2] L☉ |
Surface gravity (log g) | 1.60[3] cgs |
Temperature | ±59 4358[2] K |
Metallicity | 0.04 ± 0.04[3] |
Age | ±0.33 1.21[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
Extrasolar Planets Encyclopaedia | data |
11 Ursae Minoris (11 UMi) is the Flamsteed designation of a 5th magnitude K-type giant star located approximately 398 light years away[1] in the constellation Ursa Minor. This star is twice as massive, 28 times bigger, and 258 times more luminous than the Sun.[2]
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.[4]
11 Ursae minoris has a detected planet discovered in August 2009.[3]
Planetary system
11 Ursae minoris b was discovered during a radial velocity survey of 62 K type Red giant stars using the 2m Alfred Jensch telescope of the Thuringian State Observatory in Germany.[3]
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 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
- 1 2 3 4 5 6 7 Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155. 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b.
- 1 2 3 4 5 6 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.
- ↑ 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: