Mu1 Chamaeleontis

μ¹ Chamaeleontis, Latinized as Mu¹ Chamaeleontis, is a single^[12] star in the southern circumpolar constellation Chamaeleon. It is dimly visible to the naked eye with an apparent visual magnitude of 5.53.^[2] Based upon parallax measurements, it is located approximately 403 light-years away from the Sun.^[1] The radial velocity is poorly constrained, but it appears to be drifting further away at the rate of about 16 km/s^[5]

For other stars with this Bayer designation, see μ Chamaeleontis.

μ¹ Chamaeleontis

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Chamaeleon
Right ascension	10h 00m 43.7937s[1]
Declination	−82° 12′ 52.812″[1]
Apparent magnitude (V)	5.53[2]
Characteristics
Spectral type	A0 IV[3]
U−B color index	+0.05[4]
B−V color index	+0.03[4]
Astrometry
Radial velocity (Rv)	16±10[5] km/s
Proper motion (μ)	RA: −26.011 mas/yr[1] Dec.: +31.141 mas/yr[1]
Parallax (π)	8.0957±0.0795 mas[1]
Distance	403 ± 4 ly (124 ± 1 pc)
Absolute magnitude (MV)	+0.23[2]
Details
Mass	2.6[6] M☉
Radius	3.66[7] R☉
Luminosity	90.7[8] L☉
Surface gravity (log g)	3.73[6] cgs
Temperature	10,141+157 −240[9] K
Metallicity [Fe/H]	−0.18[6] dex
Rotational velocity (v sin i)	150[10] km/s
Other designations
μ1 Cha, CPD−81°399, FK5 3980, HD 87971, HIP 49065, HR 3983, SAO 258554[11]
Database references
SIMBAD	data

This object has a stellar classification of A0 IV,^[3] matching an A-type subgiant star. It has 2.6 times the mass of the Sun^[6] and an effective temperature of 10,141 K,^[9] giving a bluish white glow. Due to its slightly enlarged radius,^[7] the star has a luminosity over 90 times that of the Sun^[8] and spins rapidly with a projected rotational velocity of 150 km/s.^[10] Mu¹ Chamaeleontis' metallicity – elements heavier than helium – is 66% that of the Sun.^[6]