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23 Ursae Majoris
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 31m 31.70873s[1] |
| Declination | +63° 03′ 42.7013″[1] |
| Apparent magnitude (V) | +3.65[2] / +9.0 |
| Characteristics | |
| Spectral type | F0IV[3] |
| B−V color index | 0.360±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.4±0.7[2] km/s |
| Proper motion (μ) | RA: +107.99[1] mas/yr Dec.: + 27.15[1] mas/yr |
| Parallax (π) | 41.99 ± 0.16 mas[1] |
| Distance | 77.7 ± 0.3 ly (23.82 ± 0.09 pc) |
| Details | |
| 23 UMa A | |
| Mass | 1.862[3] M☉ |
| Radius | 2.90±0.03[3] R☉ |
| Luminosity | 14.8±0.1[3] L☉ |
| Temperature | 6,651±27[3] K |
| Metallicity [Fe/H] | 0.17[3] dex |
| Age | 1.3[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
23 Ursae Majoris, or 23 UMa, is a binary star system in the constellation Ursa Major,[4] located is approximately 77.7 light years from the Sun.[1] It has the Bayer designation h Ursae Majoris; 23 Ursae Majoris is the Flamsteed designation. The system is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of +3.65.[2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[2]
The primary component is a yellow-white F-type subgiant with an apparent magnitude of +3.65. It has 1.9 times the Sun's mass, 2.9 times the Sun's radius and is emitting 15 times the luminosity of the Sun[5] at an effective temperature of 6,651 K.[3] Orbiting at an angular separation of 22.7 arcseconds is the 9th magnitude secondary companion. There is a magnitude +10.5 optical companion at an angular separation of 99.6 arcseconds.
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