Xi1 Centauri
Star in the constellation Centaurus
From Wikipedia, the free encyclopedia
Xi1 Centauri is a solitary[11] star in the southern constellation of Centaurus. Its name is a Bayer designation that is Latinized from ξ1 Centauri, and abbreviated Xi1 Cen or ξ1 Cen. This star is visible to the naked eye with an apparent visual magnitude of +4.83.[3] With an annual parallax shift of 14.83 mas,[2] it is located around 220 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]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 13h 03m 33.305s[2] |
| Declination | −49° 31′ 38.15″[2] |
| Apparent magnitude (V) | +4.83[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | A0 V[4] |
| U−B color index | +0.014[3] |
| B−V color index | +0.030[3] |
| Astrometry | |
| Radial velocity (Rv) | 0.00±3.70[5] km/s |
| Proper motion (μ) | RA: −47.858 mas/yr[2] Dec.: −11.496 mas/yr[2] |
| Parallax (π) | 14.8276±0.1073 mas[2] |
| Distance | 220 ± 2 ly (67.4 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.68[1] |
| 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 | |
| ξ1 Cen, CD−48° 7887, HD 113314, HIP 63724, HR 4933, SAO 223870[10] | |
| Database references | |
| SIMBAD | data |
.jpg)
This is an A-type main sequence star with a stellar classification of A0 V.[4] It is about 125 million years old[6] with a relatively high rate of spin, having a projected rotational velocity of 185 km/s.[9] The star has an estimated 2.4 times the mass of the Sun[6] and about 2.7 times the Sun's radius.[7] It is radiating 43 times the solar luminosity[8] from its outer atmosphere at an effective temperature of 10,462 K.[6]