Mu Ursae Majoris

Mu 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 μ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 22m 19.73976s[1]
Declination +41° 29′ 58.2691″[1]
Apparent magnitude (V) +3.06[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0 IIIab[2]
U−B color index +1.90[4]
B−V color index +1.59[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)−21.30±1.66[6] km/s
Proper motion (μ) RA: –81.47[1] mas/yr
Dec.: +35.34[1] mas/yr
Parallax (π)14.16 ± 0.54 mas[1]
Distance230 ± 9 ly
(71 ± 3 pc)
Absolute magnitude (MV)−1.11±0.083[7]
Orbit[8]
Period (P)230.089 days
Semi-major axis (a)0.0028″
Eccentricity (e)0.061
Inclination (i)13.6°
Periastron epoch (T)2425577.030 JD
Argument of periastron (ω)
(secondary)		236.4°
Semi-amplitude (K1)
(primary)		7.40 km/s
Details
Mass6.3[9] M☉
Radius75[10] R☉
Luminosity977[10]–1,200[6] L☉
Surface gravity (log g)1.0[6] cgs
Temperature3,899[6] K
Metallicity [Fe/H]+0.00[11] dex
Rotational velocity (v sin i)7.5[6] km/s
companion
Mass0.96[9] M☉
Other designations
Tania Australis, Alkafzah al Thaniyah, μ Ursae Majoris, μ UMa, Mu UMa, 34 Ursae Majoris, BD+42 2115, FK5 386, GC 14232, HD 89758, HIP 50801, HR 4069, PPM 51850, SAO 43310
Database references
SIMBADdata

Mu Ursae Majoris (μ Ursae Majoris, abbreviated Mu UMa, μ UMa), formally named Tania Australis /ˈteɪniə ɔːˈstreɪlɪs/,[12][13] is a binary star in the constellation of Ursa Major. An apparent visual magnitude of +3.06[2] places it among the brighter members of the constellation. Parallax measurements give an estimated distance of roughly 230 light-years (71 parsecs) from the Sun, with a margin of error of 4%.[1]

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  2. ^ a b c Cite error: The named reference aaa352_495 was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
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  6. ^ a b c d e Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
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  9. ^ a b Cite error: The named reference kraicheva1980 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aaa498_2_489 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa338_623 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. ^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).