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61 Ursae Majoris

61 Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 41m 03.0153s
Declination +34° 12′ 05.888″
Apparent magnitude (V) 5.35
Characteristics
Spectral type G8V
U−B color index +0.27
B−V color index +0.69
R−I color index 0.37
Variable type Suspected
Astrometry
Radial velocity (Rv) −5.4 km/s
Proper motion (μ) RA: −13.95 mas/yr
Dec.: −380.46 mas/yr
Parallax (π) 104.81 ± 0.72mas
Distance 31.1 ± 0.2 ly
(9.54 ± 0.07 pc)
Absolute magnitude (MV) 5.41
Details
Mass 0.85 M
Radius 0.940 ± 0.010 R
Luminosity 0.609 ± 0.009 L
Surface gravity (log g) 4.69 cgs
Temperature 5,270 ± 32 K
Metallicity [Fe/H] +0.03 dex
Rotation 17.1 days
Rotational velocity (v sin i) 8 km/s
Age 0.8–1.2 Gyr
Other designations
BD +35°2270, FK5 1300, GCTP 2699.00, GJ 434, HD 101501, HIP 56997, HR 4496, LTT 13200, SAO 62655, NSV 5291.
Database references
SIMBAD data

61 Ursae Majoris (61 UMa) is an orange-yellow G8 main-sequence star in the constellation Ursa Major. It is somewhat smaller and fainter than the Sun, and can just barely be seen by the unaided eye (based on a magnitude limit of 6). Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.

No substellar companions have been observed in orbit around this star, and it appears to lack a dust ring as is found around some comparable stars. It lies near the same line of sight as the sub-giant star HD 101212, although it is unclear whether these two stars are gravitationally bound or even in physical proximity.

The space velocity components of this star are [U, V, W] = [+8, −16, −4] km/s. It is orbiting the galaxy at a mean distance of 7.9 kpc (26×10^3 ly) from the core with an eccentricity of 0.06.


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