Alcor (star)
Star in the constellation of Ursa Major / From Wikipedia, the free encyclopedia
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Alcor (/ˈælkɔːr/)[9] 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 both lie about 83 light-years away from the Sun, as measured by the Hipparcos astrometry satellite.
Quick Facts Constellation, Right ascension ...
Location of Alcor (Mizar is circled, Alcor is invisible beside it at this scale) | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Ursa Major |
Right ascension | 13h 25m 13.53783s[1] |
Declination | +54° 59′ 16.6548″[1] |
Apparent magnitude (V) | +3.99[2] |
Characteristics | |
Spectral type | A5Vn[3] / M3-4[4] |
Astrometry | |
Radial velocity (Rv) | −9.6[5] km/s |
Parallax (π) | 39.91 ± 0.13 mas[1] |
Distance | 81.7 ± 0.3 ly (25.06 ± 0.08 pc) |
Absolute magnitude (MV) | +2.00[2] |
Details | |
Alcor A | |
Mass | 1.84[6] M☉ |
Radius | 1.846[7] R☉ |
Luminosity | 14.03[6] L☉ |
Surface gravity (log g) | 4.25[8] cgs |
Temperature | 8,221[8] K |
Rotational velocity (v sin i) | 228[6] km/s |
Alcor B | |
Mass | 0.25[4] M☉ |
Age | 0.5 ± 0.1[2] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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