| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| Constellation | Musca |
| Right ascension | 12h 07m 49.87515s[1] |
| Declination | −75° 22′ 01.2583″[1] |
| Apparent magnitude (V) | 5.165[2] |
| Characteristics | |
| Spectral type | K2II/III[3] |
| U−Bcolor index | +1.37[4] |
| B−Vcolor index | +1.30[4] |
| Astrometry | |
| Radial velocity (Rv) | −45.30±0.8[5] km/s |
| Proper motion (μ) | RA: −92.465[1]mas/yr Dec.: +18.898[1]mas/yr |
| Parallax (π) | 6.9109±0.0916 mas[1] |
| Distance | 472 ± 6 ly (145 ± 2 pc) |
| Absolute magnitude (MV) | −0.40[6] |
| Details | |
| Radius | 30.21+1.30 −4.03[1] R☉ |
| Luminosity | 286.8+4.7 −13.3[1] L☉ |
| Temperature | 4322+320 −90[1] K |
| Other designations | |
| λ Cha,CPD−74°880,FK5 2971,HD 105340,HIP 59151,HR 4617,SAO 256905[7] | |
| Database references | |
| SIMBAD | data |
Lambda Chamaeleontis,Latinized from λ Chamaeleontis, is astar located in the constellationMusca. Lambda Chamaeleontis is also known asHR 4617, andHD 105340. This star is visible to the naked eye as a dim, orange-hued star with anapparent visual magnitude of 5.165.[2] It is located 472 light-years (145 parsecs) from theSun, based on itsparallax,[1] but is drifting closer with aradial velocity of −45 km/s.[5]
This is an agingK-typegiant/bright giant with astellar classification of K2II/III.[3] With the supply of hydrogen at itscore exhausted, the star expanded and cooled. It now has 30[1] times theradius of the Sun and is radiating 287[1] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,322 K.[1]
The star was first designated Lambda Chamaeleontis by French astronomerLacaille, in hisCoelum Australe Stelliferum. He listed it close to Pi Chamaeleontis in both brightness and location. The IAU redefinition of the constellation borders in 1930, has placed Lambda Chamaeleontis slightly over the border inMusca, rather thanChamaeleon.[8]
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