Mu Ursae Majoris
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| 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) | Script error: No such module "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] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "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 | |
| Mass | 6.3[9] Template:Solar mass |
| Radius | 75[10] Template:Solar radius |
| Luminosity | 977[10]–1,200[6] Template:Solar luminosity |
| Surface gravity (log g) | 1.0[6] cgs |
| Temperature | 3,899[6] K |
| Metallicity [Fe/H] | +0.00[11] dex |
| Rotational velocity (v sin i) | 7.5[6] km/s |
| μ UMa B | |
| Mass | 0.96[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 | |
| SIMBAD | data |
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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 Script error: No such module "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 Script error: No such module "lang". '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
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