Megrez
Star in the constellation Ursa Major / From Wikipedia, the free encyclopedia
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Megrez /ˈmiːɡrɛz/, also called Delta Ursae Majoris (δ Ursae Majoris, abbreviated Delta UMa, δ UMa),[11][12] is a star in the northern constellation of Ursa Major. With an apparent magnitude of +3.3,[2] it is the dimmest of the seven stars in the Big Dipper asterism. Parallax measurements yield a distance estimate of 80.5 light-years (24.7 parsecs) from the Sun.[1]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 12h 15m 25.56063s[1] |
Declination | +57° 01′ 57.4156″[1] |
Apparent magnitude (V) | +3.312[2] |
Characteristics | |
Spectral type | A3 V[3] |
U−B color index | +0.067[2] |
B−V color index | +0.075[2] |
Astrometry | |
Radial velocity (Rv) | -20.2[4] km/s |
Proper motion (μ) | RA: +104.11[1] mas/yr Dec.: 7.30[1] mas/yr |
Parallax (π) | 40.51 ± 0.15 mas[1] |
Distance | 80.5 ± 0.3 ly (24.69 ± 0.09 pc) |
Absolute magnitude (MV) | +1.39[5] |
Details | |
Mass | 1.63[6] M☉ |
Radius | 1.4[7] R☉ |
Luminosity | 14[7] L☉ |
Surface gravity (log g) | 4.49[7] cgs |
Temperature | 9,480±570[7] K |
Rotational velocity (v sin i) | 233[8] km/s |
Age | 0.3[9] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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