Xi1 Centauri

ξ¹ Centauri

Template:Location mark Location of ξ1 Centauri (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Centaurus
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	+4.83
Characteristics
Spectral type	A0 V
U−B Template:Engvar	+0.014
B−V Template:Engvar	+0.030
Astrometry
Radial velocity (Rv)	km/s
Proper motion (μ)	RA: −47.55 mas/yr Dec.: −11.52 mas/yr
Parallax (π)	14.79±0.27 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+0.68
Details
Mass	2.39 Template:Solar mass
Radius	2.7 Template:Solar radius
Luminosity	43.2 Template:Solar luminosity
Surface gravity (log g)	cgs
Temperature	K
Rotational velocity (v sin i)	185 km/s
Age	125 Myr
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
ξ1 Cen, CD−48° 7887, HD 113314, HIP 63724, HR 4933, SAO 223870.
Database references
SIMBAD	data

File:NGC 4945 cut test (21818932856).jpg

ξ¹ Cen is the brightest star in the picture, at the right of the galaxy NGC 4945.

Xi¹ Centauri, Latinized from ξ¹ Centauri, is a solitary star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.83. With an annual parallax shift of 14.79 mas, 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 due to intervening dust. Just 17 arc minutes to the east of Xi¹ Centauri lies the galaxy NGC 4945.

This is an A-type main sequence star with a stellar classification of A0 V. It is about 125 million years old with a relatively high rate of spin, having a projected rotational velocity of 185 km/s. The star has an estimated 2.4 times the mass of the Sun and about 2.7 times the Sun's radius. It is radiating 43 times the solar luminosity from its outer atmosphere at an effective temperature of 10,462 K.