Lambda Ursae Majoris

Lambda Ursae Majoris
	; Location of λ Ursae Majoris (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	10h 17m 05.78287s
Declination	+42° 54′ 51.6808″
Apparent magnitude (V)	+3.45
Characteristics
Spectral type	A2 IV
U−B color index	+0.06
B−V color index	+0.03
Astrometry
Radial velocity (Rv)	+18.1 km/s
Proper motion (μ)	RA: –180.65 mas/yr ; Dec.: –46.07 mas/yr
Parallax (π)	23.72 ± 0.78 mas
Distance	138 ± 5 ly ; (42 ± 1 pc)
Absolute magnitude (MV)	+0.10
Details
Mass	2.11 M☉
Radius	2.3 R☉
Luminosity	37 L☉
Surface gravity (log g)	3.76±0.14 cgs
Temperature	9,247±314 K
Metallicity [Fe/H]	+0.20 dex
Rotational velocity (v sin i)	50 km/s
Age	380 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.
Database references
SIMBAD	data

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

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