Mu Ursae Majoris

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Template:Short description

Mu Ursae Majoris
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Location of μ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +3.06[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0 IIIab[2]
U−B Template:Engvar +1.90[4]
B−V Template:Engvar +1.59[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)Template:Val[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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[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
μ UMa A
Mass6.3[9] Template:Solar mass
Radius75[10] Template:Solar radius
Luminosity977[10]–1,200[6] Template:Solar luminosity
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
μ UMa B
Mass0.96[9] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
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

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Mu Ursae Majoris is a binary star in the constellation of Ursa Major, and possibly makes part of a triple star system. It has the proper name Tania Australis Template:IPAc-en,[12][13] Mu Ursae Majoris it is Bayer designation. An apparent visual magnitude of +3.06[2] places it among the brighter members of the constellation. Parallax measurements give a distance measurement of roughly Template:Convert, with a margin of error of 4%.[1]

Stellar system

Mu Ursae Majoris is an evolved star that is currently in the red giant stage with a stellar classification of M0 IIIab.[2] It has expanded to 75 times the radius of the Sun[10] whilst the outer atmosphere has cooled to an effective temperature of 3,899 K,[6] giving it the orange-red hued glow of an M-type star.[14] Estimates of the luminosity range from 977[10]–1,200[6] times that of the Sun. It is classified as a suspected variable star with a brightness variation from magnitude 2.99m to 3.33m.[5]

This is a spectroscopic binary star system with a companion a mere 0.2 AU from the primary, with an orbital period of 230 days.[8]

In addition to the inner pair, a proper motion companion has a 99% chance to be related to this system. It has a very low mass of just 0.1 solar masses, and a projected separation of 3,900 astronomical units.[15]

Nomenclature

μ Ursae Majoris (Latinised to Mu Ursae Majoris) is the star's Bayer designation. It can be abbreviated to abbreviated Mu UMa or μ UMa.

It bore the traditional names Tania (shared with Lambda Ursae Majoris) and Tania Australis. Tania comes from the Arabic phrase Template:Transliteration 'the Second Spring (of the Gazelle)'.[16] and Australis (originally australis[17]) is Latin for 'the south side'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[18] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[19] included a table of the first two batches of names approved by the WGSN; which included Tania Australis for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Three Steps, refers to an asterism consisting of Mu Ursae Majoris, Iota Ursae Majoris, Kappa Ursae Majoris, Lambda Ursae Majoris, Nu Ursae Majoris and Xi Ursae Majoris. Consequently, the Chinese name for Mu Ursae Majoris itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[20]

References

Template:Reflist

Template:Stars of Ursa Major

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aaa352_495
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggen1992
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  6. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named aj135_1_209
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named park2013
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named ren
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named kraicheva1980
  10. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aaa498_2_489
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa338_623
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named IAU-CSN
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kervella2022
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rhallen1899
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named piazzi1814
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN1
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named zh-icon
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