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