26 Ursae Majoris

26 Ursae Majoris is a single^[9] star in the northern circumpolar constellation of Ursa Major, located 262 light years away from the Sun.^[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.47.^[2] The object is moving further from the Earth with a heliocentric radial velocity of +22 km/s.^[5]

26 Ursae Majoris

Observation data Epoch J2000      Equinox J2000
Constellation	Ursa Major
Right ascension	09h 34m 49.43259s[1]
Declination	+52° 03′ 05.3165″[1]
Apparent magnitude (V)	4.47[2]
Characteristics
Evolutionary stage	main sequence
Spectral type	A0 Vn[3]
U−B color index	+0.00[4]
B−V color index	+0.027±0.013[2]
Astrometry
Radial velocity (Rv)	+22.2±1.1[5] km/s
Proper motion (μ)	RA: −65.74[1] mas/yr Dec.: −37.32[1] mas/yr
Parallax (π)	12.44±0.19 mas[1]
Distance	262 ± 4 ly (80 ± 1 pc)
Absolute magnitude (MV)	−0.06[2]
Details
Mass	2.16[6] M☉
Radius	2.2[7] R☉
Luminosity	99.2[2] L☉
Surface gravity (log g)	3.94[6] cgs
Temperature	9,757±332[6] K
Rotational velocity (v sin i)	165[3] km/s
Age	147[6] Myr
Other designations
26 UMa, BD+52°1402, HD 82621, HIP 47006, HR 3799, SAO 27298[8]
Database references
SIMBAD	data

This is an A-type main-sequence star with a stellar classification of A0 Vn,^[3] where the 'n' indicates "nebulous" lines in the spectrum due to rapid rotation. It has a high rate of spin with a projected rotational velocity of 165 km/s,^[3] which is giving it an oblate shape with an equatorial bulge that is 8% larger than the polar radius.^[10] The star is 147^[6] million years old with just over double^[6] the mass of the Sun and twice^[7] the Sun's radius. It is radiating 99^[2] times the Sun's luminosity from its photosphere at an effective temperature of 9,757 K.^[6]