26 Ursae Majoris
Star in the constellation Ursa Major
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26 Ursae Majoris is a single[10] star in the northern circumpolar constellation of Ursa Major, located 262 light years away from the Sun.[2] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.47.[1] The object is moving further from the Earth with a heliocentric radial velocity of +22 km/s.[6]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Ursa Major[1] |
| Right ascension | 09h 34m 49.43259s[2] |
| Declination | +52° 03′ 05.3165″[2] |
| Apparent magnitude (V) | 4.47[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A0 Vn[4] |
| U−B color index | +0.00[5] |
| B−V color index | +0.027±0.013[1] |
| Astrometry | |
| Radial velocity (Rv) | +22.2±1.1[6] km/s |
| Proper motion (μ) | RA: −65.74[2] mas/yr Dec.: −37.32[2] mas/yr |
| Parallax (π) | 12.44±0.19 mas[2] |
| Distance | 262 ± 4 ly (80 ± 1 pc) |
| Absolute magnitude (MV) | −0.06[1] |
| Details | |
| Mass | 2.16[7] M☉ |
| Radius | 2.2[8] R☉ |
| Luminosity | 99.2[1] L☉ |
| Surface gravity (log g) | 3.94[7] cgs |
| Temperature | 9,757±332[7] K |
| Rotational velocity (v sin i) | 165[4] km/s |
| Age | 147[7] Myr |
| Other designations | |
| 26 UMa, BD+52°1402, HD 82621, HIP 47006, HR 3799, SAO 27298[9] | |
| Database references | |
| SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A0 Vn,[4] 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,[4] which is giving it an oblate shape with an equatorial bulge that is 8% larger than the polar radius.[11] The star is 147[7] million years old with just over double[7] the mass of the Sun and twice[8] the Sun's radius. It is radiating 99[1] times the Sun's luminosity from its photosphere at an effective temperature of 9,757 K.[7]