Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Centaurus |
Right ascension | 13h 03m 33.30528s[1] |
Declination | −49° 31′ 38.1518″[1] |
Apparent magnitude (V) | +4.83[2] |
Characteristics | |
Spectral type | A0 V[3] |
U−B color index | +0.014[2] |
B−V color index | +0.030[2] |
Astrometry | |
Radial velocity (Rv) | 0.00±3.70[4] km/s |
Proper motion (μ) | RA: −47.55[1] mas/yr Dec.: −11.52[1] mas/yr |
Parallax (π) | 14.79 ± 0.27 mas[1] |
Distance | 221 ± 4 ly (68 ± 1 pc) |
Absolute magnitude (MV) | +0.68[5] |
Details[6] | |
Mass | 2.39 M☉ |
Radius | 2.7[7] R☉ |
Luminosity | 43.2[8] L☉ |
Surface gravity (log g) | 4.11±0.14 cgs |
Temperature | 10,462±356 K |
Rotational velocity (v sin i) | 185[9] km/s |
Age | 125 Myr |
Other designations | |
Database references | |
SIMBAD | data |
Xi1 Centauri, Latinized from ξ1 Centauri, is a solitary[11] star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.83.[2] With an annual parallax shift of 14.79 mas,[1] it is located around 221 light years from the Sun. At that distance, the apparent visual magnitude of the star is diminished by an interstellar extinction factor of 0.10[12] due to intervening dust. Just 17 arc minutes to the east of Xi1 Centauri lies the galaxy NGC 4945.[13]
This is an A-type main sequence star with a stellar classification of A0 V.[3] It is about 125[6] million years old with a relatively high rate of spin, having a projected rotational velocity of 185 km/s.[9] The star has an estimated 2.4[6] times the mass of the Sun and about 2.7[7] times the Sun's radius. It is radiating 43[8] times the solar luminosity from its outer atmosphere at an effective temperature of 10,462 K.[6]
vanLeeuwen2007
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