Omicron Ursae Majoris

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Omicron Ursae Majoris
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Location of ο Ursa Major (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +3.35[2]
Characteristics
Spectral type G5III:[3]
U−B Template:Engvar +0.52[4]
B−V Template:Engvar +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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)–0.40[7]
Details[8]
Mass2.72 Template:Solar mass
Radius13.84 Template:Solar radius
Luminosity116 Template:Solar luminosity
Surface gravity (log g)2.58 cgs
Temperature5,242[7] K
Metallicity [Fe/H]Script error: No such module "val". dex
Rotational velocity (v sin i)3.83[9] km/s
Age360 ± 30[10] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
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

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Omicron Ursae Majoris (ο Ursae Majoris, abbreviated Omicron UMa, ο UMa), formally named Muscida Template:IPAc-en,[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 Script error: No such module "convert". from the Sun.[1] In 2012, an exoplanet designated Omicron Ursae Majoris Ab was found to be orbiting the primary.[9]

Nomenclature

ο Ursae Majoris (Latinised to Omicron Ursae Majoris) is the star's Bayer designation.

The traditional name Muscida was shared with the optical double star Pi Ursae Majoris. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[14] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[15] included a table of the first two batches of names approved by the WGSN; which included Muscida for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Inner Steps, refers to an asterism consisting of ο Ursae Majoris, 16 Ursae Majoris, 6 Ursae Majoris, 23 Ursae Majoris, 5 Ursae Majoris and 17 Ursae Majoris. Consequently, the Chinese name for ο Ursae Majoris itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.).[16]

Properties and observations

The stellar classification of this star, G5 III, indicates that it is in the giant stage of its evolution. The interferometry-measured angular diameter of this star is about 2.42 mas,[17] which, at its estimated distance, equates to a physical radius of about 14 times the radius of the Sun.[18] It has about three times the mass of the Sun and radiates 116 times the Sun's luminosity from its outer atmosphere[8] at an effective temperature of 5,282 K,[2] giving it the yellowish hue of a G-type star.[19]

In 1963, East German astronomer Gerhard Jakisch reported this star as a variable with a period of 358 days and an amplitude of 0.08 magnitude. The 1982 edition of the New Catalogue of Suspected Variable Stars listed it with a variability from 3.30 to 3.36 in the visual band. However, in 1992 American astronomer Dorrit Hoffleit noted that the two comparison stars used to determine the variability may themselves be variable. Hence the actual variability of this star may be suspect.[20]

Muscida has a magnitude 15.2 common proper motion companion at an angular separation of 7.1 arcseconds.[21] With a probability of 99.4%, this companion is the source for the X-ray emission from the system.[22] Omicron Ursae Majoris is sometimes listed with two more companions, but, based on proper motion data, these appear to be optical companions. No other companions were detected by 2016.[23]

This system is a member of the thin disk population and is following an orbit through the Milky Way galaxy with an eccentricity of 0.12. It comes as close to the Galactic Center as Script error: No such module "convert". and as distant as Script error: No such module "convert".. This orbit carries it no more than about 330 ly (100 pc) above the galactic plane.[10] It is considered a runaway star because it has a high peculiar velocity of 35.5 km s−1 relative to the typical motion of stars in its vicinity.[24]

The star has no detectable magnetic fields.[25]

Planetary system

In 2012, an exoplanet designated Omicron Ursae Majoris Ab and orbiting the primary at 3.9 astronomical units, was found. This gas giant (4.1 times as massive as Jupiter) completes an orbit in 1630 days.[9]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet

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References

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  1. ↑ a b c Script error: No such module "Citation/CS1".
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  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b c Template:Cite Gaia EDR3
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日 Template:Webarchive
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".. The radius (R*) is given by:
    2⋅R*=(10−3⋅54.9⋅2.42) AU0.0046491 AU/R⨀≈28.6⋅R⨀
  19. ↑ Script error: No such module "citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Script error: No such module "Citation/CS1".
  23. ↑ Script error: No such module "Citation/CS1".
  24. ↑ Script error: No such module "Citation/CS1".
  25. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Ursa Major

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