11 Ursae Minoris b

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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
Distance398 ± 9[1] ly
(122 ± 3[1] pc)
Spectral type K4 III[2]
Orbital elements
Semi-major axis(a) 1.54 ± 0.07 AU
Eccentricity (e) 0.08 ± 0.03
Orbital period(P) 516.22 ± 3.25 d
(1.4133 ± 0.0089 y)
Argument of
(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[3]
Other designations
HD 136726 b, HIP 74793 b, HR 5714 b
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

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.[3]


  1. ^ a b c d 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
  2. ^ 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.
  3. ^ a b 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.

Coordinates: Sky map 15h 17m 05.8886s, +71° 49′ 26.044″