Gamma Chamaeleontis
Star in the constellation Chamaleon
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Gamma Chamaeleontis is a solitary[9] star located in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from γ Chamaeleontis, and abbreviated Gamma Cha or γ Cha. This star can faintly be seen with the naked eye on a dark night, having an apparent visual magnitude of 4.12.[3] Based upon an annual parallax shift of 7.35 mas,[2] it is located around 444 light-years (136 pc) from the Sun. This star is drifting closer with a line of sight velocity component of −22 km/s.[5]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 10h 35m 28.106s[2] |
| Declination | −78° 36′ 28.039″[2] |
| Apparent magnitude (V) | 4.12[3] |
| Characteristics | |
| Spectral type | K5 III[4] |
| U−B color index | +1.94[3] |
| B−V color index | +1.580±0.320[1] |
| Astrometry | |
| Radial velocity (Rv) | −22.4[5] km/s |
| Proper motion (μ) | RA: −37.929 mas/yr[2] Dec.: +11.234 mas/yr[2] |
| Parallax (π) | 7.3514±0.1416 mas[2] |
| Distance | 444 ± 9 ly (136 ± 3 pc) |
| Absolute magnitude (MV) | −1.43[1] |
| Details | |
| Radius | 78+5 −3[2] R☉ |
| Luminosity | 864[6] L☉ |
| Surface gravity (log g) | −0.24±0.12[7] cgs |
| Temperature | 3,870±39[7] K |
| Metallicity [Fe/H] | −1.28±0.11[7] dex |
| Rotational velocity (v sin i) | 9.7±3.7[7] km/s |
| Other designations | |
| γ Cha, CD−77°454, FK5 401, HD 92305, HIP 51839, HR 4174, SAO 256731[8] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K5 III.[4] It is a suspected variable star, with an amplitude of 0.01 magnitude.[10] With 78 times the radius of the Sun,[2] this star radiates 864[6] times the solar luminosity from its enlarged outer atmosphere at an effective temperature of 3,870 K.[7]