Delta1 Chamaeleontis

For other stars with this Bayer designation, see δ Chamaeleontis.
δ1 Chamaeleontis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 45m 16.31446s[1]
Declination −80° 28′ 10.5409″[1]
Apparent magnitude (V) 5.47[2] (6.266 + 6.503)[3]
Characteristics
Spectral type K0 III[4]
U−B color index +0.74[2]
B−V color index +0.95[2]
Astrometry
Radial velocity (Rv)+10.7[5] km/s
Proper motion (μ) RA: −17.28[1] mas/yr
Dec.: −29.25[1] mas/yr
Parallax (π)9.36 ± 0.45 mas[1]
Distance350 ± 20 ly
(107 ± 5 pc)
Absolute magnitude (MV)+0.32[6]
Details
Luminosity76[7] L☉
Temperature5,052[7] K
Other designations
δ1 Cha, CPD−79°554, HD 93779, HIP 52595, HR 4231, SAO 258592[8]
Database references
SIMBADdata

Delta1 Chamaeleontis, Latinized from δ1 Chamaeleontis, is a close double star located in the constellation Chamaeleon. It has a combined apparent visual magnitude of 5.47,[2] which is just bright enough for the star to be faintly seen on a dark rural night. With an annual parallax shift of 9.36 mas,[1] it is located around 350 light years from the Sun. This pair is one of two stars named Delta Chamaeleontis, the other being the slightly brighter Delta2 Chamaeleontis located about 6 arcminutes away.[9] 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.[10]

The two components of Delta1 Chamaeleontis have visual magnitudes of 6.3 and 6.5. As of 2000, the pair had an angular separation of 0.783 arcseconds along a position angle of 83.8°.[3] They can be separated by a 7.9 in (20 cm) aperture telescope.[9] The pair is a source of X-ray emission with a flux of 27.4×10−17 W/m2.[11] The stellar classification of Delta1 Chamaeleontis is K0 III,[4] which matches an evolved K-type giant star.

  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 Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Fabricius2000 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. ^ Cite error: The named reference Wilson1953 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 Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Inglis2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference OMeara2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Schmitt1998 was invoked but never defined (see the help page).