11 Ursae Minoris

Star in the constellation Ursa Minor Ursa Minor constellation map.svg center 250 right Red circle.svg 10 11 Ursae Minoris 440 718 Location of 11 Ursae Minoris (invisible beside γ Ursae Minoris at this scale) J2000.0 Ursa Minor 15 17 05.88946 +71 49 26.0473 5.15 K4 III B 6.664 J 2.657 H 1.931 0.192 K 1.701 0.198 1.514 0.004 −17.80 0.12 +4.073 +9.477 7.9260 0.1249 −0.37 2.60 0.48 0.44 29.14 0.45 1.78 0.04 250 6 4253 25 commas 15.63 0.57 AU 30.65 1.10 AU -0.02 0.05 639 507 278 Pherkad Minor 11 UMi +72°678 8864 136726 74793 5714 8870 8207 11 UMi 8 September 2012 11+UMi 11 UMi 11+UMi 11 Ursae Minoris, formally named Pherkad Minor, is a single star located approximately 410 light-years away in the northern circumpolar constellation of Ursa Minor. The star is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.15. It is moving closer to the Earth with a heliocentric radial velocity of −17.8 km/s. Nomenclature 11 Ursae Minoris is the star's Flamsteed designation. It is sometimes named Pherkad Minor (alternatively spelled Pherkard), in reference to the brighter nearby star Pherkad (Major) which is γ Ursae Minoris. The name originated with Giuseppe Piazzi. 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. The IAU Working Group on Star Names approved the name Pherkad Minor for 11 Ursae Minoris on 22 March 2026 and it is now so entered in the IAU Catalog of Star Names. Stellar properties This is an aging K-type giant star with a stellar classification of K4 III. It is 600 million years old with twice the mass of the Sun. As a consequence of exhausting the hydrogen at its core, the star has expanded to 29 times the Sun's radius. It is radiating 250 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,253 K. Planetary system 11 Ursae Minoris has a detected planet discovered in August 2009. 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. A newer mass measurement of the host star implies a larger planetary mass of 14.15 1.23 Jupiter mass, which would likely make 11 Ursae Minoris b a low-mass brown dwarf. b ≥ 14.15 1.23 516.22 ± 3.25 1.54 ± 0.07 0.08 ± 0.03 References 1696798367260229376 XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 September 2008 10.1111/j.1365-2966.2008.13596.x free . 2008MNRAS.389..869E 0806.2878 14878976 Baines Ellyn K. Jones Jeremy Clark James H. Schmitt Henrique R. Stone Jordan M. January 2025 Eighteen Exoplanet Host Stars from the NPOI Data Archive The Astronomical Journal en 169 2 83 10.3847/1538-3881/ad9bb1 free 1538-3881 2506.02934 Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer Baines Ellyn K. Armstrong J. Thomas Schmitt Henrique R. Zavala R. T. Benson James A. Hutter Donald J. Tycner Christopher Belle Gerard T. van 1 The Astronomical Journal 155 30 2018 1 1712.08109 2018AJ....155...30B 10.3847/1538-3881/aa9d8b 119427037 free Soubiran C. Creevey O. Lagarde N. Brouillet N. Jofré P. Casamiquela L. Heiter U. Aguilera–Gómez C. Vitali S. Worley C. de Brito Silva D. February 2024 Gaia FGK benchmark stars: Fundamental Teff and log ɡ of the third version (Corrigendum) Astronomy & Astrophysics 693 C3 10.1051/0004-6361/202453050e 2310.11302 0004-6361 Planetary companions around the K giant stars 11 Ursae Minoris and HD 32518 http://www.aanda.org/articles/aa/full_html/2009/39/aa11702-09/aa11702-09.html Döllinger P. Hatzes A. P. Pasquini L. Guenther E. W. Hartmann M. 1 Astronomy and Astrophysics 505 3 1311–1317 2009 0908.1753 2009A&A...505.1311D 10.1051/0004-6361/200911702 9686080 Kostjuk N. D. 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 2004 2004yCat.4027....0K IAU Catalog of Star Names https://exopla.net/star-names/modern-iau-star-names/ 23 March 2026 External links http://exoplanet.eu/star.php?st=11+UMi https://web.archive.org/web/20090819025425/http://exoplanet.eu/star.php?st=11+UMi dead August 19, 2009 Notes for star 11 UMi Jean Schneider 2011 Extrasolar Planets Encyclopaedia 30 September 2011 15 17 05.8886 + 71 49 26.044 389.8 Category:K4III stars Category:Planetary systems with one confirmed planet Category:Ursa Minor BD+72 0678 Ursae Minoris, 11 136726 074793 5714 Pherkad Minor