V763 Centauri

This article is about C¹ Centauri. For c¹ Centauri, see HD 129456. For other stars with this Bayer designation, see C Centauri.

C¹ Centauri is a single^[8] star in the southern constellation of Centaurus. It has the variable star designation V763 Centauri, while C¹ Centauri is the Bayer designation. The star has a red hue and is dimly visibly to the naked eye with an apparent visual magnitude that fluctuates around +5.64.^[3] It is located at a distance of approximately 600 light years based on parallax, and has an absolute magnitude of −1.05.^[3] It is drifting further away with a radial velocity of +21 km/s.^[2] At one time it was a candidate member of the Zeta Herculis Moving Group but has since been excluded.^[9]

C¹ Centauri

A light curve for V763 Centauri, plotted from Hipparcos data[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Centaurus
Right ascension	11h 35m 13.28134s[2]
Declination	−47° 22′ 21.2888″[2]
Apparent magnitude (V)	+5.64[3]
Characteristics
Evolutionary stage	AGB[4]
Spectral type	M3/4III[5]
B−V color index	+1.682±0.019[3]
Variable type	Lb[6]
Astrometry
Radial velocity (Rv)	+21.07±0.29[2] km/s
Proper motion (μ)	RA: -87.503[2] mas/yr Dec.: -6.988[2] mas/yr
Parallax (π)	5.4236±0.1476 mas[2]
Distance	600 ± 20 ly (184 ± 5 pc)
Absolute magnitude (MV)	−1.05[3]
Details
Radius	64.7+5.9 −4.3[2] R☉
Luminosity	754±24[2] L☉
Temperature	3,761+130 −161[2] K
Other designations
C1 Cen, V763 Centauri, CD−46°7199, GC 15886, HD 100733, HIP 56518, HR 4463, SAO 222887, CCDM J11352-4722[7]
Database references
SIMBAD	data

This object is an aging red giant star on the asymptotic giant branch^[4] with a stellar classification of M3/4III.^[5] Samus et al. (2017) classify this as a slow irregular variable of sub-type Lb and its brightness varies from magnitude +5.52 down to +5.82.^[6] It was previously classified as a semiregular variable of sub-type SRb.^[10] With the supply of hydrogen and helium at its core exhausted, the star has expanded until now it has 65 times the radius of the Sun. It is radiating 754 times the luminosity of the Sun from its photosphere at an effective temperature of 3,761 K.^[2]