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 | |
Database references | |
SIMBAD | data |
CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.[1][6]
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
[edit]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.[citation needed]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 13±6 MJ | 210 | — | — | — | — |
References
[edit]- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ "Notes on CHXR 73 b". Extrasolar Planets Encyclopaedia. Retrieved 24 December 2016.
- ^ a b 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. arXiv:1304.1150. Bibcode:2013A&A...554A..43D. doi:10.1051/0004-6361/201321220. S2CID 59440639.
- ^ a b Bowler, Brendan P. (2016), "Imaging Extrasolar Giant Planets", Publications of the Astronomical Society of the Pacific, 128 (968): 102001, arXiv:1605.02731, doi:10.1088/1538-3873/128/968/102001, S2CID 118614968
- ^ a b "CHXR 73". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 November 2016.
- ^ "Newfound Object Further Blurs Planet Definition". Space.com. Retrieved 13 November 2016.
- ^ Luhman, K. (2006). "Discovery of a Young Substellar Companion in Chamaeleon". The Astrophysical Journal. 649 (2): 894–899. arXiv:astro-ph/0609187. Bibcode:2006ApJ...649..894L. doi:10.1086/506517. S2CID 14609766.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
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