CT Chamaeleontis
CT Chamaeleontis and its companion (faint object on the upper right near the star) Credit: NASA/ESA/CSA JWST; Ya-Lin Wu et al.; processing: Meli_thev | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 04m 09.0989s |
| Declination | −76° 27′ 19.327″ |
| Apparent magnitude (V) | 12.31 to 12.43 |
| Characteristics | |
| A | |
| Evolutionary stage | T Tauri star |
| Spectral type | K7 Ve |
| Variable type | INB |
| b | |
| Spectral type | M8–L0 |
| Astrometry | |
| Radial velocity (Rv) | 15.13±0.09 km/s |
| Proper motion (μ) | RA: −22.209±0.039 mas/yr Dec.: −0.175±0.035 mas/yr |
| Parallax (π) | 5.2144±0.0211 mas |
| Distance | 625 ± 3 ly (191.8 ± 0.8 pc) |
| Position (relative to CT Chamaeleontis) | |
| Component | b |
| Epoch of observation | 2006–2007 |
| Angular distance | 2.670″ |
| Position angle | 300.7° |
| Projected separation | ~440 AU |
| Details | |
| A | |
| Mass | 0.796+0.015 −0.014 M☉ |
| Radius | 2.06±0.05 R☉ |
| Luminosity | 1.41+0.17 −0.16 L☉ |
| Surface gravity (log g) | 4.5+0.7 −1.2 cgs |
| Temperature | 4402+151 −166 K |
| Age | 2±2 Myr |
| b | |
| Mass | 17±6 MJup |
| Radius | 2.20+0.81 −0.60 RJup |
| Luminosity | 0.002 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 2500±100 K |
| Age | 2±2 Myr |
| Other designations | |
| CT Cha, 2MASS J11040909−7627193, IRAS 11027−7611, NSV 5081, WDS J11042−7627AB | |
| Database references | |
| SIMBAD | data |
| B | |
Disk around CT Cha with VLT/SPHERE
CT Chamaeleontis (CT Cha) is a T Tauri star - a primary of the star system in the constellation of Chamaeleon. The star belongs to Chamaeleon I, which is part of the Chamaeleon complex. It has an apparent visual magnitude which varies between 12.31 and 12.43. Observations with JWST MIRI did show that the disk around CT Cha A does not contain any carbon molecules. Emission lines of water and OH were identified. The low energy emission by water comes from cold (≲200 K (−73 °C; −100 °F)) water. The disk around the star was directly imaged with ALMA and VLT/SPHERE.
Cuno Hoffmeister discovered that CT Chamaeleontis is a variable star in 1962. It was given its variable star designation in 1981.