 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[1] |
| Declination | −76° 27′ 19.3269″[1] |
| Apparent magnitude (V) | 12.31 to 12.43[2] |
| Characteristics | |
| A | |
| Evolutionary stage | T Tauri star |
| Spectral type | K7 Ve[3] |
| Variable type | INB[2] |
| B | |
| Spectral type | M8–L0[4] |
| Astrometry | |
| Radial velocity (Rv) | 15.13±0.09[5] km/s |
| Proper motion (μ) | RA: −22.209±0.039[1]mas/yr Dec.: −0.175±0.035[1]mas/yr |
| Parallax (π) | 5.2144±0.0211 mas[1] |
| 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″[4] |
| Position angle | 300.7°[4] |
| Projected separation | ~440AU[4] |
| Details[4][6] | |
| 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 | 4,402+151 −166 K |
| Age | 2±2[4] Myr |
| B | |
| Mass | 19±5[7] MJup |
| Radius | 2.20+0.81 −0.60 RJup |
| Luminosity | 0.002 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 2,500±100[7] K |
| Age | 2±2[4] Myr |
| Other designations | |
| CT Cha,2MASS J11040909-7627193,IRAS 11027-7611,NSV 5081,WDS J11042-7627AB | |
| Database references | |
| SIMBAD | data |
| B | |
CT Chamaeleontis (CT Cha) is aT Tauri star - a primary of the star system in theconstellation ofChamaeleon.[8] It has anapparent visual magnitude which varies between 12.31 and 12.43.[2] The star is still accreting material at rate6×10−10 M☉/year.[7]
Cuno Hoffmeister discovered that CT Chamaeleontis is a variable star in 1962.[9] It was given itsvariable star designation in 1981.[10]
In 2006 and 2007, a faint companion was observed 2.7arcseconds away from CT Chamaeleontis, using theVery Large Telescope at theEuropean Southern Observatory. Since the object sharescommon proper motion with CT Chamaeleontis, it is believed to be physically close to the star, with aprojected separation of approximately 440astronomical units. It is estimated to have a mass of approximately 17Jupiter masses and is probably abrown dwarf or a planet.[4] The companion has been either designated asCT Chamaeleontis b[12] or asCT Chamaeleontis B, sometimes erroneously as low-mass star.[13] The companion was proven to be most likely in thebrown dwarf mass range in 2015.[7]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk[6] | 6.1–9.3AU | 54.0+1.0 −0.9° | — | |||
| protoplanetary disk[14] | 64.6±4.2AU | 45.7±5.0° | — | |||
| B | 19±5[7] MJ | 514 | — | — | — | 2.20+0.81 −0.60[4] RJ |
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