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Xi Geminorum
Star in the constellation Gemini / From Wikipedia, the free encyclopedia
Xi Geminorum (ξ Geminorum, abbreviated Xi Gem, ξ Gem), formally named Alzirr /ˈælzər/,[10] is a star in the zodiac constellation of Gemini. It forms one of the four feet of the outline demarcating the Gemini twins.[11] The star has an apparent visual magnitude of 3.35,[2] which is bright enough for it to be seen with the naked eye. From stellar parallax measurements, its distance from the Sun can be estimated as 58.7 light-years (18.0 parsecs).[1]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Gemini |
Right ascension | 06h 45m 17.36432s[1] |
Declination | +12° 53′ 44.1311″[1] |
Apparent magnitude (V) | 3.35[2] |
Characteristics | |
Spectral type | F5 IV-V[3] |
U−B color index | +0.06[4] |
B−V color index | +0.43[4] |
Astrometry | |
Radial velocity (Rv) | +25.6[2] km/s |
Proper motion (μ) | RA: –115.73[1] mas/yr Dec.: –190.55[1] mas/yr |
Parallax (π) | 55.56 ± 0.19 mas[1] |
Distance | 58.7 ± 0.2 ly (18.00 ± 0.06 pc) |
Absolute magnitude (MV) | 2.14[5] |
Details | |
Mass | 1.706 ± 0.012[6] M☉ |
Radius | 2.710 ± 0.021[6] R☉ |
Luminosity | 11.574 ± 0.238[6] L☉ |
Surface gravity (log g) | 3.81 ± 0.02[7] cgs |
Temperature | 6,480 ± 39[6] K |
Metallicity [Fe/H] | 0.00 ± 0.01[7] dex |
Rotational velocity (v sin i) | 66.1 ± 3.3[8] km/s |
Age | 1.5[9] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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