Delta2 Chamaeleontis

For other stars with this Bayer designation, see δ Chamaeleontis.
δ2 Chamaeleontis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 45m 47.00487s[1]
Declination −80° 32′ 24.6785″[1]
Apparent magnitude (V) 4.42[2]
Characteristics
Spectral type B3 V[3] or B2.5 IV[4]
U−B color index −0.728[2]
B−V color index −0.192[2]
Astrometry
Radial velocity (Rv)+22.6[5] km/s
Proper motion (μ) RA: −36.86[1] mas/yr
Dec.: +5.90[1] mas/yr
Parallax (π)9.30 ± 0.13 mas[1]
Distance351 ± 5 ly
(108 ± 2 pc)
Absolute magnitude (MV)−0.71[6]
Details
Mass5.0±0.1[7] M☉
Radius3.9[8] R☉
Luminosity503[9] L☉
Temperature15,873[9] K
Age32.6±16.3[7] Myr
Other designations
δ2 Cha, CPD−79°556, FK5 411, HIP 52633, HR 4234, SAO 258593[10]
Database references
SIMBADdata

Delta2 Chamaeleontis, Latinized from δ2 Chamaeleontis, is a solitary[11] star located in the southern circumpolar constellation of Chamaeleon. It has an apparent visual magnitude of 4.42,[2] which is bright enough for the star to be seen with the naked eye. Based upon an annual parallax shift of 9.30 mas,[1] it is located around 351 light years from the Sun. This star is one of two stars named Delta Chamaeleontis, the other being the fainter Delta1 Chamaeleontis located about 6 arcminutes away.[12] Delta Chamaeleontis forms the southernmost component of the constellation's "dipper" or bowl. Together with Gamma Chamaeleontis, they point to a spot that is within 2° of the south celestial pole.[13]

This is a B-type main sequence star with a stellar classification of B3 V.[3] However, Hiltner et al. (1969) give a classification of B2.5 IV,[4] which would suggest it is a more evolved subgiant star. It is estimated to have five[7] times the mass of the Sun and 3.9[8] times the Sun's radius. With an age of 32.6[7] million years, it is radiating over 500 times the solar luminosity from its outer atmosphere at an effective temperature of 15,873[9] K. There is a 70% likelihood that this star is a member of Gould's Belt.[14]

  1. ^ a b c d e f 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 GutierrezMoreno1968 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Evans1967 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Inglis2012 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference OMeara2002 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Bobylev2007 was invoked but never defined (see the help page).