Chi Ursae Majoris

Chi Ursae Majoris
Location of χ Ursae Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Major
Right ascension 11h 46m 03.01407s[1]
Declination +47° 46′ 45.8553″[1]
Apparent magnitude (V) 3.72[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type K0.5 IIIb[4]
U−B color index +1.16[2]
B−V color index +1.18[2]
Astrometry
Radial velocity (Rv)−9.02±0.20[2] km/s
Proper motion (μ) RA: −138.297 mas/yr[1]
Dec.: +28.66 mas/yr[1]
Parallax (π)16.438 ± 0.113 mas[1]
Distance198 ± 1 ly
(60.8 ± 0.4 pc)
Absolute magnitude (MV)0.10±0.02[5]
Details[2]
Mass1.49[6] M☉
Radius23.15±0.21[7] R☉
Luminosity170.1±5.3[7] L☉
Surface gravity (log g)2.2 cgs
Temperature4,331±33[7] K
Metallicity [Fe/H]−0.44 dex
Rotational velocity (v sin i)2.3 km/s
Other designations
Alkaphrah[8], El Koprah[8], Taiyangshou, Chi UMa, χ UMa, 63 Ursae Majoris, BD+48°1966, FK5 441, HD 102224, HIP 57399, HR 4518, SAO 43886[9]
Database references
SIMBADdata

Chi Ursae Majoris or χ Ursae Majoris, formally named Taiyangshou /ˌtaɪˌjæŋˈʃoʊ/,[10] is a single[11] star in the northern circumpolar constellation of Ursa Major. The star has an orange hue and is visible to the naked eye at night with an apparent visual magnitude of 3.72.[2] It is located at a distance of approximately 198 light-years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −9 km/s.[2]

  1. ^ a b c d e Cite error: The named reference DR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference park2013 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference baines was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Bakich1995 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  11. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).