Delta1 Chamaeleontis

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]

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]
Distance	350 ± 20 ly (107 ± 5 pc)
Absolute magnitude (MV)	+0.32[6]
Details
Luminosity	76[7] L☉
Temperature	5,052[7] K
Other designations
δ1 Cha, CPD−79°554, HD 93779, HIP 52595, HR 4231, SAO 258592[8]
Database references
SIMBAD	data

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.