23 Ursae Majoris
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Ursa Major |
| Right ascension | 09h 31m 31.708s / 28.2s |
| Declination | +63° 03′ 42.70″ / 43″ |
| Apparent magnitude (V) | +3.65 / +9.0 |
| Distance | 75.5 ± 1.1 ly (23.1 ± 0.3 pc) |
| Spectral type | A: F0IV |
| Other designations | |
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.[1] 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,[2]
References [edit]
- ^ Boyajian, Tabetha S. et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101. See Table 10.
- ^ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442
External links [edit]
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