Omega Ursae Majoris

Omega Ursae Majoris

Location of ω Ursae Majoris (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Ursa Major
Right ascension	10^h 53^m 58.7^s
Declination	+43° 11' 24"
Apparent magnitude (V)	+4.66
Characteristics
Spectral type	A1V s
Astrometry
Distance	267 ± 15 ly (82 ± 5 pc)
Other designations
ω Ursae Majoris, ω UMa, Omega UMa, 45 Ursae Majoris, BD+43 2058, FK5 2870, GC 14974, HD 94334, HIP 53295, HR 4248, PPM 52125, SAO 43512.
Database references
SIMBAD	data

Omega Ursae Majoris (Omega UMa, ω Ursae Majoris, ω UMa) is a binary star in the constellation Ursa Major. It is approximately 267 light years from Earth.

Omega Ursae Majoris is a spectroscopic binary which is classified as a white A-type main sequence dwarf with an apparent magnitude of +4.66. The binary system has an orbital period of 15.8 days.

Naming

In Chinese, 天牢 (Tiān Láo), meaning Celestial Prison, refers to an asterism consisting of ω Ursae Majoris, 57 Ursae Majoris, 47 Ursae Majoris, 58 Ursae Majoris, 49 Ursae Majoris and 56 Ursae Majoris. Consequently, ω Ursae Majoris itself is known as 天牢一 (Tiān Láo yī, English: the First Star of Celestial Prison.).^[1]

References

1. (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日