CHXR 73

CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.^[1][6]

CHXR 73

HST image of CHXR 73 and its companion
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Chamaeleon
Right ascension	11h 06m 28.7626s[1]
Declination	−77° 37′ 33.1444″[1]
Characteristics
Spectral type	M3[2]
Astrometry
Proper motion (μ)	RA: −22.193±0.233[1] mas/yr Dec.: 0.215±0.206[1] mas/yr
Parallax (π)	5.2343±0.1759 mas[1]
Distance	620 ± 20 ly (191 ± 6 pc)
Details[3]
Mass	0.32 ± 0.11 M☉
Radius	0.83 ± 0.04 R☉
Luminosity	0.09 ± 0.07 L☉
Temperature	3490 ± 180 K
Age	2±1[4] Myr
Other designations
2MASS J11062877-7737331[5]
Database references
SIMBAD	data

The star is located within Cha I, a molecular cloud.^[5] It has a low temperature of 3,490 K typical of red dwarfs, but unlike typical red dwarfs it has an unusually large radius of 0.83 R_☉—this is because of its young age, only 8 million years.^[3]

Planetary system

A companion, CHXR 73 b, has been found via direct imaging. CHXR 73 has a mass of about 12 Jupiters.^[7] This is close to the upper mass limit for planets, making its classification difficult.

The CHXR 73 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	13±6 MJ	210	—	—	—	—