HD 100825

For other stars with this Bayer designation, see C Centauri.

HD 100825 is a single^[7] star in the southern constellation of Centaurus. It has the Bayer designation C² Centauri, while HD 100825 is the identifier from the Henry Draper catalogue. The star has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.26.^[1] It is located at a distance of 187 light years from the Sun based on parallax, with an absolute magnitude of +1.31.^[1] The radial velocity is poorly constrained, but the star appears to be drifting further away from the Sun at the rate of around 5 km/s.^[1] It is a member of the Sirius supercluster of co-moving stars.^[8]

C² Centauri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Centaurus[1]
Right ascension	11h 35m 55.58491s[2]
Declination	−47° 38′ 29.9038″[2]
Apparent magnitude (V)	+5.26[1]
Characteristics
Evolutionary stage	main sequence[2]
Spectral type	F0V[3] or A7m[4]
B−V color index	+0.257±0.003[1]
Astrometry
Radial velocity (Rv)	+5.2±2.8[1] km/s
Proper motion (μ)	RA: +33.654[2] mas/yr Dec.: −49.433[2] mas/yr
Parallax (π)	17.1828±0.0741 mas[2]
Distance	189.8 ± 0.8 ly (58.2 ± 0.3 pc)
Absolute magnitude (MV)	+1.31[1]
Details
Mass	1.62[5] M☉
Radius	2.83[2] R☉
Luminosity	21[2] L☉
Surface gravity (log g)	3.97±0.14[5] cgs
Temperature	7,737±263[5] K
Age	467[5] Myr
Other designations
C2 Cen, CD−46°7205, FK5 435, GC 15901, HD 100825, HIP 56573, HR 4466, SAO 222895[6]
Database references
SIMBAD	data

This is an Am star^[4] or metallic-line star with a stellar classification of F0V,^[3] indicating it is a F-type main-sequence star that is generating energy by core hydrogen fusion. It is an estimated 467^[5] million years old and has 1.62^[5] times the mass of the Sun. The star is radiating 21 times the luminosity of the Sun^[2] from its photosphere at an effective temperature of 7,737 K.^[5]