Chi Ursae Majoris

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Chi Ursae Majoris
Location of χ Ursae Majoris (circled)
Observation data
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]
Distance
198 ± 1 ly
(60.8 ± 0.4 pc)
Absolute magnitude (MV)0.10±0.02[5]
Details
Rotational velocity
(v sin i)		2.3 km/s
HR 4518, SAO 43886[9]
Database references
SIMBADdata

Chi Ursae Majoris or χ Ursae Majoris, formally named Taiyangshou

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]

Nomenclature

Chi Ursae Majoris and NGC 3877

χ Ursae Majoris (Latinised to Chi Ursae Majoris) is the star's Bayer designation.

It bore the

Purple Forbidden enclosure (see : Chinese constellations). It also bore traditional names of Arabic origin: Alkafzah, Alkaphrah, and El Koprah.[8]

In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Taiyangshou for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[10]

Properties

Chi Ursae Majoris is an

helium fusion at its core. This star has expanded to 23[7] times the radius of the Sun with 1.49 times the Sun's mass.[6] It is radiating 170 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,331 K.[7]

The spiral galaxy in Ursa Major, NGC 3877 (= H I.201), type Sc, is best found from Chi Ursae Majoris, which is almost exactly 15 arcminutes north of the galaxy.

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    doi:10.1093/mnras/172.3.667
    .
  3. ^
    S2CID 16673121
    .
  4. ^
    doi:10.1086/191373
    .
  5. S2CID 119187733
    .
  6. ^
    S2CID 118505114
    .
  7. ^
    doi:10.3847/1538-3881/ac2431
    .
  8. ^
    ISBN 0521449219
  9. ^ "chi UMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-22.{{cite web}}: CS1 maint: postscript (link)
  10. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  11. S2CID 14878976
    .
  12. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Ursa Major
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
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