Beta Chamaeleontis
Location of β Chamaeleontis (circled in red) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 12h 18m 20.82459s[1] |
| Declination | −79° 18′ 44.0710″[1] |
| Apparent magnitude (V) | 4.24[2] (4.24 to 4.30)[3] |
| Characteristics | |
| Spectral type | B4 V[4] |
| U−B color index | −0.52[2] |
| B−V color index | −0.13[2] |
| R−I color index | −0.10[5] |
| Astrometry | |
| Radial velocity (Rv) | +23.0[6] km/s |
| Proper motion (μ) | RA: −37.97[1] mas/yr Dec.: +11.15[1] mas/yr |
| Parallax (π) | 10.93±0.15 mas[1] |
| Distance | 298 ± 4 ly (91 ± 1 pc) |
| Absolute magnitude (MV) | −0.57[7] |
| Details | |
| Mass | 5.0±0.1[8] M☉ |
| Radius | 2.84±0.13[9] R☉ |
| Luminosity | 212[10] L☉ |
| Surface gravity (log g) | 4.03±0.05[9] cgs |
| Temperature | 14,495±157[9] K |
| Rotational velocity (v sin i) | 255[5] km/s |
| Age | 22.7±7.2[8] Myr |
| Other designations | |
| β Cha, CD−78°495, CPD−78°741, FK5 459, GC 16775, HD 106911, HIP 60000, HR 4674, SAO 256924, PPM 371459[11] | |
| Database references | |
| SIMBAD | data |
Beta Chamaeleontis, Latinized from β Chamaeleontis, is the third-brightest star in the southern constellation of Chamaeleon. A solitary,[12] suspected variable star, it is visible to the naked eye as a faint blue-white point of light with an apparent visual magnitude that has been measured ranging between 4.24 and 4.30.[3] Parallax measurements yield a distance estimate of 298 light years from the Sun, and it is drifting further away with a radial velocity of +23 km/s.[6]
This is a B-type main-sequence star with a stellar classification of B4 V[4] that is generating energy through core hydrogen fusion. It has been catalogued both as a Be star[2] and a normal star.[13] This object is about 23[8] million years old with a high projected rotational velocity of 255 km/s.[5] The rapid rotation is creating an equatorial bulge that is 12% larger than the polar radius.[14] The star has five[8] times the mass of the Sun and 2.8[9] times the Sun's radius. It is radiating 212[10] times the luminosity of the Sun from its photosphere at an effective temperature of 14,495 K.[9]
References
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- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c HR 4674, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 5, 2008.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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