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11 Ursae Minoris

11 Ursae Minoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Minor
Right ascension 15h 17m 05.89154s[1]
Declination +71° 49′ 26.0375″[1]
Apparent magnitude (V) 5.15[2]
Characteristics
Spectral type K4 III[3]
Apparent magnitude (B) 6.664[2]
Apparent magnitude (J) 2.657[2]
Apparent magnitude (H) 1.931±0.192[2]
Apparent magnitude (K) 1.701±0.198[2]
B−V color index 1.514±0.004[2]
Astrometry
Radial velocity (Rv)−17.52±0.15[1] km/s
Proper motion (μ) RA: 3.430[1] mas/yr
Dec.: 10.113[1] mas/yr
Parallax (π)7.9539 ± 0.1249 mas[1]
Distance410 ± 6 ly
(126 ± 2 pc)
Absolute magnitude (MV)–0.37[4]
Details[3]
Mass2.04±0.20 M☉
Radius28.20+0.71
−0.73 R☉
Luminosity258.8±17.7 L☉
Surface gravity (log g)1.60[4] cgs
Temperature4,358±59 K
Metallicity0.04 ± 0.04[4]
Age1.21±0.33 Gyr
Other designations
11 UMi, V1032 UMi, BD+72°678, FK5 1140, HD 136726, HIP 74793, HR 5714, SAO 8207, PPM 8870, GCRV 8864[5]
Database references
SIMBADdata
Exoplanet Archivedata

11 Ursae Minoris is a single[6] star located approximately 410 light years away[1] 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.[2] It is moving closer to the Earth with a heliocentric radial velocity of −17.5 km/s.[1]

This is an aging K-type giant star with a stellar classification of K4 III.[3] It is 1.2 billion years old with twice the mass of the Sun.[3] As a consequence of exhausting the hydrogen at its core, the star has expanded to 28 times the Sun's radius.[3] It is radiating 258 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,358 K.[3]

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.[7] 11 Ursae Minoris is the Flamsteed designation.

11 Ursae Minoris has a detected planet discovered in August 2009.[4]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Baines2018 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Döllinger2009 was invoked but never defined (see the help page).
  5. ^ "11 UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 September 2012.
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference xref was invoked but never defined (see the help page).

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