File:Ursa_Major_constellation_map.svg · Wikimedia Commons · See Wikimedia Commons
Also known as 77 Ursae Majoris, HD 112185, Epsilon Ursae Majoris, The Jade Sighting-Tube, ε UMa, ε Ursae Majoris, 77 UMa, HIP 62956
Alioth , also called Epsilon Ursae Majoris, is a star in the northern constellation of Ursa Major. The designation is Latinised from ε Ursae Majoris and abbreviated Epsilon UMa or ε UMa. Despite being designated "ε" (epsilon), it is the brightest star in the constellation and at magnitude 1.77 is the thirty-third brightest star in the sky.
Wikidata facts
- Instance of
- rotating variable star
- Location
- Ursa Major
- Constellation
- Ursa Major
- Distance from Earth
- 24.2627
- Diameter
- 5760000
- Radius
- 4.14
- Mass
- 2.91
- Variable-star type
- Alpha² Canum Venaticorum variable
- Image
- Ursa major constellation map-fr.png
Show 17 more facts
- catalog code
- Renson 32580
- spectral class
- A0.P,SB
- apparent magnitude
- 1.731607
- stellar rotational velocity
- 32.9
- effective temperature
- 3
- absolute magnitude
- -0.2
- right ascension
- 193.50728996750
- declination
- 55.95982295694
- parallax
- 40.30
- radial velocity
- -9.8
- metallicity
- -0.10
- epoch
- J2000.0
- surface gravity
- 3000
- right ascension component of proper motion
- 82
- declination component of proper motion
- -15
- age estimated by a dating method
- 300
- Commons category
- Alioth
via Wikidata · CC0
Article · 中文
玉衡（ε UMa / 大熊座ε）是大熊座最亮的恒星，也是北斗七星之一，是一颗猎犬座α²变星，每隔5.089日而變光為1.76等～1.78等亮。距離地球約80光年。它是大熊座熊尾部最近熊体的星，也是勺柄部最接近勺斗部的星。它还是大熊座移动星群的一分子。历史上，此星常常用于航海贸易的天文导航，因此名列57颗导航星中。
Abstract from DBpedia / Wikipedia · CC BY-SA