Delta1 Chamaeleontis
Star in the constellation Chamaeleon
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Delta1 Chamaeleontis is a close double star located in the constellation Chamaeleon. Its name is a Bayer designation that is Latinized from δ1 Chamaeleontis, and abbreviated Delta1 Cha or δ1 Cha. They have a combined apparent visual magnitude of 5.47,[3] which is just bright enough to be faintly visible to the naked eye as a point of light on a dark rural night. With an annual parallax shift of 9.36 mas,[2] it is located around 350 light-years (110 pc) 350 light years from the Sun.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Chamaeleon[1] |
| Right ascension | 10h 45m 16.31446s[2] |
| Declination | −80° 28′ 10.5409″[2] |
| Apparent magnitude (V) | 5.47[3] (6.266 + 6.503)[4] |
| Characteristics | |
| Spectral type | K0 III[5] |
| U−B color index | +0.74[3] |
| B−V color index | +0.95[3] |
| Astrometry | |
| Radial velocity (Rv) | +10.7[6] km/s |
| Proper motion (μ) | RA: −17.28[2] mas/yr Dec.: −29.25[2] mas/yr |
| Parallax (π) | 9.36±0.45 mas[2] |
| Distance | 350 ± 20 ly (107 ± 5 pc) |
| Absolute magnitude (MV) | +0.32[1] |
| 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, WDS J10453-8028[8] | |
| Database references | |
| SIMBAD | data |
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°.[4] They can be visually separated using 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,[5] which matches an evolved K-type giant star.