CHXR 73
Star in the constellation Chamaleon
From Wikipedia, the free encyclopedia
CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.[2][7]
Right ascension11h 06m 28.7626s[2]
Declination−77° 37′ 33.1444″[2]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 11h 06m 28.7626s[2] |
| Declination | −77° 37′ 33.1444″[2] |
| Characteristics | |
| Spectral type | M3[3] |
| Astrometry | |
| Proper motion (μ) | RA: −22.193±0.233[2] mas/yr Dec.: 0.215±0.206[2] mas/yr |
| Parallax (π) | 5.2343±0.1759 mas[2] |
| Distance | 620 ± 20 ly (191 ± 6 pc) |
| Details[4] | |
| 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[5] Myr |
| Other designations | |
| 2MASS J11062877-7737331[6] | |
| Database references | |
| SIMBAD | data |
The star is located within Cha I, a molecular cloud.[6] 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.[4]
Planetary system
A companion, CHXR 73 b, has been found via direct imaging. CHXR 73 has a mass of about 12 Jupiters.[8] This is close to the theoretical boundary between planets and brown dwarfs, making its classification difficult.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 13±6 MJ | 210 | — | — | — | — |
