23 Ursae Majoris

23 Ursae Majoris

Observation data Epoch 2000      Equinox 2000
Constellation	Ursa Major
Right ascension	09^h 31^m 31.708^s/28.2^s
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
23 UMa, h UMa, BD +63 845, CCDM J09315+6303A/B, FK5 355, HD 81937, HIP 46733, HR 3757, SAO 14908
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

1. Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, 40. See Table 3.
2. 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.
3. Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442

External links

• 23 Ursae Majoris at Jim Kaler's STARS