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Gamma Ursae Minoris

γ Ursae Minoris
Location of γ Ursae Minoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Minor
Right ascension 15h 20m 43.71604s[1]
Declination +71° 50′ 02.4596″[1]
Apparent magnitude (V) +3.05[2]
Characteristics
Spectral type A2 III[3]
U−B color index +0.08[2]
B−V color index +0.09[2]
Astrometry
Radial velocity (Rv)−3.9[4] km/s
Proper motion (μ) RA: −17.73[1] mas/yr
Dec.: +17.90[1] mas/yr
Parallax (π)6.70 ± 0.11 mas[1]
Distance487 ± 8 ly
(149 ± 2 pc)
Absolute magnitude (MV)–2.84[5]
Details
Radius15[6] R☉
Luminosity1,100[6] L☉
Surface gravity (log g)2.53[7] cgs
Temperature8,280[8] K
Rotational velocity (v sin i)180[9] km/s
Other designations
Pherkad, Pherkad Major, Gamma Ursae Minoris, 13 Ursae Minoris, HR 5735, BD+72°679, HD 137422, SAO 8220, HIP 75097
Database references
SIMBADdata

Gamma Ursae Minoris (γ Ursae Minoris, abbreviated Gamma UMi, γ UMi), also named Pherkad /ˈfɜːrkæd/,[10][11] is a star in the northern constellation of Ursa Minor. Together with Beta Ursae Minoris (Kochab), it forms the end of the dipper pan of the "Little Dipper", which is an asterism forming the tail of the bear. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 487 light-years (149 parsecs) from the Sun.[1]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference apjss52_7 was invoked but never defined (see the help page).
  3. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ^ Cite error: The named reference fk6_1999 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference verdugo_et_al2005 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference kaler was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aaa354_157 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa501_1_297 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa393_897 was invoked but never defined (see the help page).
  10. ^ Rumrill, H. B. (June 1936). "Star Name Pronunciation". Publications of the Astronomical Society of the Pacific. 48 (283). San Francisco, California: 139. Bibcode:1936PASP...48..139R. doi:10.1086/124681. S2CID 120743052.
  11. ^ "Naming Stars". IAU.org. Retrieved 4 March 2018.

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