Astronomy:CHXR 73
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Short description: Star in the constellation Chamaleon
250px HST image of CHXR 73 and its companion | |
| Observation data Equinox J2000.0]] (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[2] mas |
| 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 | |
| Database references | |
| SIMBAD | data |
CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.[2][7]
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 | — | — | — | — |
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ "Notes on CHXR 73 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/chxr_73_b--833/. Retrieved 24 December 2016.
- ↑ 4.0 4.1 Daemgen, S.; Petr-Gotzens, M. G.; Correia, S.; Teixeira, P. S.; Brandner, W.; Kley, W.; Zinnecker, H. (2013). "Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I". Astronomy & Astrophysics 554: A43. doi:10.1051/0004-6361/201321220. Bibcode: 2013A&A...554A..43D.
- ↑ 5.0 5.1 Bowler, Brendan P. (2016), "Imaging Extrasolar Giant Planets", Publications of the Astronomical Society of the Pacific 128 (968), doi:10.1088/1538-3873/128/968/102001
- ↑ 6.0 6.1 "CHXR 73". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CHXR+73.
- ↑ "Newfound Object Further Blurs Planet Definition". Space.com. http://www.space.com/2858-newfound-object-blurs-planet-definition.html.
- ↑ Luhman, K. (2006). "Discovery of a Young Substellar Companion in Chamaeleon". The Astrophysical Journal 649 (2): 894–899. doi:10.1086/506517. Bibcode: 2006ApJ...649..894L.
Coordinates: 
11h 06m 28.7626s, −77° 37′ 33.1444″
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