- Mu Ursae Majoris
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μ Ursae Majoris Observation data
Epoch J2000.0 Equinox J2000.0Constellation Ursa Major Right ascension 10h 22m 19.7s Declination +41° 29' 58" Apparent magnitude (V) +3.06 Distance 249 ± 14 ly
(76 ± 4 pc)Spectral type M0III Other designations Mu Ursae Majoris (μ UMa, μ Ursae Majoris) is a star in the constellation Ursa Major. It also has the proper names Tania Australis (former Tania australis[1]) meaning "the Southern (star) of Tania." The word Tania comes from the Arabic phrase (al-Qafzah) al-Thāniyah meaning "the Second (Leap)" (the distinctions "southern" (australis) is added in Latin), Alkafzah Borealis[citation needed], and El Phekrah[2] comes from the Arabic phrase al-Fiqrah (al-Thāniyah) meaning "(the Second) Vertebra". With Lambda Ursae Majoris, they were Chung Tae （中台）, the Middle Dignitary, in Chinese astronomy.[3]
Mu Ursae Majoris is a M-type red giant with a mean apparent magnitude of 3.0m. It is approximately 250 light years from the Earth. It is classified as a Semiregular variable star and its brightness varies from magnitude 2.99m to 3.33m.
Spectroscopically it has been determined that this is a double star with a companion a mere 1.5 AU from the primary with a rotation period of 230 days.
References
- ^ Piazzi, G., The Palermo Catalogue, Palermo, 1814.
- ^ Burritt, E. H., Atlas, Designed to Illustrate the Geography of the Heavens, New York, 1835.
- ^ Allen, Richard Hinckley (1899). Star-Names and Their Meanings. New York: G. E. Stechert., p.443.
Stars of Ursa Major Bayer α (Dubhe) • β (Merak) • γ (Phecda) • δ (Megrez) • ε (Alioth) • ζ (Mizar) • η (Alkaid) • θ (Alhaud) • ι (Talitha Bor) • κ (Talitha Aus) • λ (Tania Bor) • μ (Tania Aus) • ν (Alula Bor) • ξ (Alula Aus) • ο (Muscida) • π¹ • π² • ρ • σ¹ • σ² • τ • υ • φ • χ • ψ • ω • b • c • d • e • f • g (Alcor) • h • AFlamsteed 1 (ο, Muscida) • 2 (A) • 3 (π¹) • 4 (π²) • 5 (b) • 6 • 7 • 8 (ρ) • 9 (ι, Talitha Bor) • 11 (σ¹) • 12 (κ, Talitha Aus) • 13 (σ²) • 14 (τ) • 15 (f) • 16 (c) • 17 • 18 (e) • 19 • 20 • 21 • 22 • 23 (h) • 24 (d) • 25 (θ, Alhaud) • 26 • 27 • 28 • 29 (υ) • 30 (φ) • 31 • 32 • 33 (λ, Tania Bor) • 34 (μ, Tania Aus) • 35 • 36 • 37 • 38 • 39 • 40 • 41 • 42 • 43 • 44 • 45 (ω) • 46 • 47 • 48 (β, Merak) • 49 • 50 (α, Dubhe) • 51 • 52 (ψ) • 53 (ξ, Alula Aus) • 54 (ν, Alula Bor) • 55 • 56 • 57 • 58 • 59 • 60 • 61 • 62 • 63 (χ) • 64 (γ, Phecda) • 65 • 66 • 67 • 68 • 69 (δ, Megrez) • 70 • 71 • 72 • 73 • 74 • 75 • 76 • 77 (ε, Alioth) • 78 • 79 (ζ, Mizar) • 80 (g, Alcor) • 81 • 82 • 83 • 84 • 85 (η, Alkaid) • 86 • 55 Cam • 56 Cam • 57 Cam • 1 CVn • 14 LMi • 15 LMi • 47 LMi • 37 Lyn • 41 Lyn • 44 LynNearby Lalande 21185 • WISE 1405+5534 • Gliese 412 • Groombridge 1618 • Gliese 338 • GJ 1151 • ξ (Alula Aus) • Gliese 450 • Gliese 424 • Groombridge 1830Other R • S • W • Winnecke 4List Categories:- Bayer objects
- Ursa Major constellation
- M-type giants
- Semiregular variables
- Spectroscopic binaries
- Stars with proper names
- Variable star stubs
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