Alcor

Also known as 80 Ursae Majoris, g Ursae Majoris, HD 116842

star in the constellation of Ursa Major

Astronomical data · SIMBAD

Object type: **
Spectral type: A5V+M3-4V
Distance: 82 light-years
Redshift: z = -0.000029686763820757633
Coordinates: RA 201.3064° · Dec 54.9880°

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Key facts

Constellation: Ursa Major
Right ascension: 13 25 13.53783
Declination: +54 ° 59 ′ 16.6548 ″
Apparent magnitude v: +3.99
Spectral type: A5Vn / M3-4

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Wikidata facts

Part of: Ursa Major Moving Group
Constellation: Ursa Major
Distance from Earth: 24.7127
Variable-star type: Delta Scuti variable
Image: Mizar en Alcor.jpg

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catalog code: UBV M 19376
apparent magnitude: 3.974355
right ascension: 201.30640763875
declination: 54.98795966139
effective temperature: 7955
parallax: 40.4651
spectral class: A5VSB
stellar rotational velocity: 248
radial velocity: 0.1
epoch: J2000.0
absolute magnitude: 2
surface gravity: 7600
Commons category: Alcor
right ascension component of proper motion: 113.37
declination component of proper motion: -29.498

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Encyclopedic overview

Alcor (/ˈælkɔːr/) is a binary star system in the constellation of Ursa Major. It is the fainter companion of Mizar, the two stars forming a naked eye double in the handle of the Big Dipper (or Plough) asterism in Ursa Major. The two lie about 83 light-years away from the Sun, as measured by the Hipparcos astrometry satellite.

Nomenclature

Excerpted from Wikipedia’s “Alcor” article, available under the CC BY-SA 4.0 licence.

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