CT Chamaeleontis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 04m 09.131s[1] |
| Declination | −76° 27′ 19.30″[1] |
| Apparent magnitude (V) | 12.31 to 12.43[2] |
| Characteristics | |
| Spectral type | K7[1] |
| B−V color index | −0.9[1] |
| V−R color index | 0.8[1] |
| Variable type | INB[2] |
| Astrometry | |
| Radial velocity (Rv) | 15.1 ± 0.5[1] km/s |
| Proper motion (μ) | RA: −21.3 ± 4.6[3] mas/yr Dec.: 6.3 ± 4.5[3] mas/yr |
| Distance | 540 ± 100 ly (165 ± 30[3] pc) |
| Details[3] | |
| Age | 4 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Position (relative to CT Chamaleontis) | |
|---|---|
| Epoch of observation | 2006–2007 |
| Angular distance | 2.670″ [3] |
| Position angle | 300.7° [3] |
| Observed separation (projected) | ~440 AU [3] |
| Characteristics | |
| Spectral type | M8–L0[3] |
| Details[3] | |
| Mass | 17 ± 6 MJup |
| Radius | 2.2+0.81 −0.6 RJup |
| Luminosity | 0.002 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 2,600 ± 250 K |
| Age | 4 Myr |
| Other designations | |
CT Cha b. | |
| Database references | |
| SIMBAD | data |
CT Chamaeleontis (CT Cha) is a T Tauri star in the constellation of Chamaeleon.[1] It has an apparent visual magnitude which varies between 12.31 and 12.43.[2]
In 2006 and 2007, a faint companion was observed 2.7 arcseconds away from CT Chamaeleontis, using the Very Large Telescope at the European Southern Observatory. Since the object shares common proper motion with CT Chamaleontis, it is believed to be physically close to the star, with a projected separation of approximately 440 astronomical units. It is estimated to have a mass of approximately 17 Jupiter masses and is probably a brown dwarf or a planet.[3] The companion has been designated CT Chamaeleontis b.[4]
| Companion | Mass | Observed separation (AU) | Discovery year |
| b | 17 ± 6 MJ | 200 | 2008 |
References
- 1 2 3 4 5 6 7 V* CT Cha -- T Tau-type Star, database entry, SIMBAD. Accessed on line October 1, 2008.
- 1 2 3 CT Cha, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line October 1, 2008.
- 1 2 3 4 5 6 7 8 9 10 Direct evidence of a sub-stellar companion around CT Cha, T. O. B. Schmidt et al., accepted for publication in Astronomy and Astrophysics, Bibcode: 2008arXiv0809.2812S, arXiv:0809.2812.
- ↑ NAME CT Cha b -- Extra-solar Planet Candidate, database entry, SIMBAD. Accessed on line October 1, 2008.
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