23 Ursae Majoris
| Observation data Epoch 2000 Equinox 2000 |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 31m 31.708s/28.2s |
| Declination | +63° 03′ 42.70″/43″ |
| Apparent magnitude (V) | +3.65 / +9.0 |
| Characteristics | |
| Spectral type | F0IV[1] |
| Astrometry | |
| Distance | 75.5 ± 1.1 ly (23.1 ± 0.3 pc) |
| Details | |
| 23 UMa A | |
| Mass | 1.862[1] M☉ |
| Radius | 2.90 ± 0.03[1] R☉ |
| Luminosity | 14.8 ± 0.1[1] L☉ |
| Temperature | 6,651 ± 27[1] K |
| Metallicity [Fe/H] | 0.17[1] dex |
| Age | 1.3[1] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
23 Ursae Majoris, or 23 UMa, is a binary star system in the constellation Ursa Major. It is approximately 75.5 light years from Earth.
The primary component is a yellow-white F-type subgiant with an apparent magnitude of +3.65. It has 2.9 times the Sun's radius and is emitting 15 times the luminosity of the Sun.[2] 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.
With φ, υ, θ, τ, e, and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and al-Haud, the Pond,[3]
References
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