Beta Chamaeleontis

Beta Chamaeleontis
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]
Distance298 ± 4 ly
(91 ± 1 pc)
Absolute magnitude (MV)−0.57[7]
Details
Mass5.0±0.1[8] M☉
Radius2.84±0.13[9] R☉
Luminosity212[10] L☉
Surface gravity (log g)4.03±0.05[9] cgs
Temperature14,495±157[9] K
Rotational velocity (v sin i)255[5] km/s
Age22.7±7.2[8] Myr
Other designations
α Oct, CD−78°495, CPD−78°741, FK5 459, GC 16775, HD 106911, HIP 60000, HR 4674, SAO 256924, PPM 371459[11]
Database references
SIMBADdata

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]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Feinstein1979 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference bsc2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Wielen1999 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference mnras410_1_190 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference aj129_3_1642 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference sb0 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Grady1987 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).