Solitary red giant star in the constellation Ursa Major
Rho Ursae Majoris
Location of ρ Ursae Majoris (circled)
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Ursa Major
Right ascension
09h 02m 32.69092s[1]
Declination
+67° 37′ 46.6280″[1]
Apparent magnitude (V)
4.74[2]
Characteristics
Spectral type
M3 III[3]
U−B color index
+1.84[2]
B−V color index
+1.56[2]
Astrometry
Radial velocity (Rv)
4.75±0.19[4] km/s
Proper motion (μ)
RA: −22.83[1] mas/yr Dec.: +18.13[1] mas/yr
Parallax (π)
10.37 ± 0.25 mas[1]
Distance
315 ± 8 ly (96 ± 2 pc)
Absolute magnitude (MV)
+0.06[5]
Details
Radius
58[6]R☉
Luminosity
464[7]L☉
Temperature
3,725[7] K
Other designations
ρ UMa, 8 Ursae Majoris, BD+68°551, FK5 338, HD 76827, HIP 44390, HR 3576, SAO 14742[8]
Database references
SIMBAD
data
Rho Ursae Majoris (ρ UMa) is the Bayer designation for a solitary[9] star in the northern circumpolar constellation of Ursa Major. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] The distance to this star, based upon an annual parallax shift of 10.37 mas,[1] is around 315 light years.
With a stellar classification of M3 III,[3] this is a red giant star on the asymptotic giant branch.[10] It is a suspected small amplitude variable.[11] The measured angular diameter of the star after correcting for limb darkening is 5.64±0.15 mas,[12] which, at the estimated distance of this star, yields a physical size of about 58 times the radius of the Sun.[6] It is radiating 464 times the solar luminosity from its outer atmosphere at an effective temperature of about 3,725 K.[7] Based upon its motion through space, there is a 60.6% chance that this star is a member of the Sirius stream.[5]
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