Lambda Ursae Majoris

Lambda 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 λ Ursae Majoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 17m 05.78287s[1]
Declination +42° 54′ 51.6808″[1]
Apparent magnitude (V) +3.45[2]
Characteristics
Spectral type A2 IV[3]
U−B color index +0.06[2]
B−V color index +0.03[2]
Astrometry
Radial velocity (Rv)+18.1[4] km/s
Proper motion (μ) RA: –180.65[1] mas/yr
Dec.: –46.07[1] mas/yr
Parallax (π)23.72 ± 0.78 mas[1]
Distance138 ± 5 ly
(42 ± 1 pc)
Absolute magnitude (MV)+0.10[5]
Details
Mass2.11[6] M☉
Radius2.3[7] R☉
Luminosity37[7] L☉
Surface gravity (log g)3.76±0.14[6] cgs
Temperature9,247±314[6] K
Metallicity [Fe/H]+0.20[8] dex
Rotational velocity (v sin i)50[9] km/s
Age380[6] Myr
Other designations
Tania Borealis, λ Ursae Majoris, λ UMa, Lambda UMa, 33 Ursae Majoris, BD+43 2005, FK5 383, GC 14113, HD 89021, HIP 50372, HR 4033, PPM 51795, SAO 43268.[10]
Database references
SIMBADdata

Lambda Ursae Majoris (λ Ursae Majoris, abbreviated Lambda UMa, λ UMa), formally named Tania Borealis /ˈteɪniə ˌbɒriˈælɪs/,[11][12] is a star in the northern circumpolar constellation of Ursa Major.

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  6. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
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  11. ^ 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.
  12. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.