Omicron Ursae Majoris

"Muscida" redirects here. For other stars with this name, see π Ursae Majoris.
Omicron Ursae Majoris
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings

Location of ο Ursa Major (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 08h 30m 15.87064s[1]
Declination +60° 43′ 05.4115″[1]
Apparent magnitude (V) +3.35[2]
Characteristics
Spectral type G5III:[3]
U−B color index +0.52[4]
B−V color index +0.85[4]
Astrometry
Radial velocity (Rv)+19.8[5] km/s
Proper motion (μ) RA: -133.644[6] mas/yr
Dec.: -107.664[6] mas/yr
Parallax (π)17.9335 ± 0.1456 mas[6]
Distance182 ± 1 ly
(55.8 ± 0.5 pc)
Absolute magnitude (MV)–0.40[7]
Details[8]
Mass2.72 M☉
Radius13.84 R☉
Luminosity116 L☉
Surface gravity (log g)2.58 cgs
Temperature5,242[7] K
Metallicity [Fe/H]−0.16+0.08
−0.1 dex
Rotational velocity (v sin i)3.83[9] km/s
Age360 ± 30[10] Myr
Other designations
Muscida, ο Ursae Majoris, ο UMa, Omicron UMa, 1 Ursae Majoris, BD+61 1054, CCDM J08303+6043A, FK5 317, GC 11593, HD 71369, HIP 41704, HR 3323, PPM 16654, SAO 14573, WDS J08303+6043A, 2MASS J08301592+6043056, Gaia EDR3 1041808368494264576[11]
Database references
SIMBADdata

Omicron Ursae Majoris (ο Ursae Majoris, abbreviated Omicron UMa, ο UMa), formally named Muscida /ˈmjuːsɪdə/,[12][13] is a star system in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.35[2] and is located at a distance of around 179 light-years (55 parsecs) from the Sun.[1] In 2012, an exoplanet designated Omicron Ursae Majoris Ab was found to be orbiting the primary.[9]

  1. ^ a b c Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference aaa352_495 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference perkins was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. ^ a b Cite error: The named reference pasj60_4_781 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Teng2023 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Sato2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aaa480_1_91 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.