Ro Big Dipper

Ursa Major Ro ( ρ Ursae Majoris , ρ UMa ) is a single ^[9] star in the northern constellation Ursa Major . It is poorly visible to the naked eye, has a visible magnitude of 4.74. ^[2] The distance to this star obtained by measuring parallax equal to 10.37 msd ^[1] is about 315 light years .

Ro Big Dipper
Star
Observational data ( Age J2000)
Right ascension	09 h 02 m 32.69092 s [1]
Declination	+ 67 ° 37 ′ 46.6280 ″ [1]
Visible magnitude ( V )	4.74 [2]
Constellation
Astrometry
Radial velocity ( R v )	4.75 ± 0.19 [3] km / s
Own movement (μ)	RA: −22.83 [1] Dec: +18,13 [1]
Parallax (π)	10.37 ± 0.25 [1] mas
Absolute magnitude (V)	+0.06 [4]
Specifications
Spectral class	M3 III [5]
Color Index ( B - V )	+1.56 [2]
Color Index ( U - B )	+1.84 [2]
physical characteristics
Radius	58 [6] R ☉
Temperature	3725 [7] K
Luminosity	464 [7] L ☉
Other designations ρ UMa, 8 Ursae Majoris, BD + 68 ° 551, FK5 338, HD 76827, HIP 44390, HR 3576, SAO 14742. [8]
Database Information
SIMBAD	data

Belongs to the spectral class M3 III, ^[5] that is, it is a red giant on the asymptotic branch of giants . ^[10] Probably a variable star with a small amplitude. ^[11] The measured angular diameter of the star after correction for darkening to the edge is 5.64 ± 0.15 mas , ^[12] which corresponds to a linear size of about 58 solar radii. ^[6] The luminosity ρ of Ursa Major is 464 of the luminosity of the Sun, the effective temperature is estimated at 3715 K. ^[7] Based on the data on the spatial motion of the star, the probability of belonging to its Sirius flux is estimated at 60.6%. ^[four]