Delta Caeli
Star in the constellation Caelum
From Wikipedia, the free encyclopedia
Delta Caeli is a solitary,[9] blue-white hued star in the southern constellation of Caelum. Its name is a Bayer designation that is Latinized from δ Caeli, and abbreviated Delta Cae or Delta Cae. This is a dim star but visible to the naked eye, having an apparent visual magnitude of +5.06.[2] Based upon an annual parallax shift of 4.63 mas as seen from Earth,[1] this star is located approximately 680 light-years (210 pc) away. At that distance, the visual magnitude is diminished by an extinction factor of 0.13 due to interstellar dust.[5] It is receding from the Sun with a radial velocity of 14 km/s.[4]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Caelum |
| Right ascension | 04h 30m 50.100s[1] |
| Declination | −44° 57′ 13.50″[1] |
| Apparent magnitude (V) | +5.06[2] |
| Characteristics | |
| Spectral type | B2 IV-V[3] |
| U−B color index | −0.78[2] |
| B−V color index | −0.20[2] |
| Astrometry | |
| Radial velocity (Rv) | 14.2±0.8[4] km/s |
| Proper motion (μ) | RA: +1.683 mas/yr[1] Dec.: −3.139 mas/yr[1] |
| Parallax (π) | 4.7826±0.0889 mas[1] |
| Distance | 680 ± 10 ly (209 ± 4 pc) |
| Absolute magnitude (MV) | −1.35[5] |
| Details | |
| Mass | 6.78±0.06[1] M☉ |
| Radius | 3.95±0.10[1] R☉ |
| Luminosity | 2,075+73 −68[1] L☉ |
| Surface gravity (log g) | 3.965+0.012 −0.016[1] cgs |
| Temperature | 19,616±32[1] K |
| Rotational velocity (v sin i) | 10.0[6] km/s |
| Age | 9.4±0.6[7] Myr |
| Other designations | |
| δ Cae, CD−45°1567, FK5 167, HD 28873, HIP 21060, HR 1443, SAO 216850[8] | |
| Database references | |
| SIMBAD | data |
This is a B-type star with a stellar classification of B2 IV-V,[3] where the luminosity class IV-V indicates the spectrum shows mixed traits of a subgiant star and a main sequence star. It has 7 times the mass of the Sun and about 4 times the Sun's radius.[1] The star is around nine[7] million years old and is spinning with a projected rotational velocity of 10 km/s.[6] It is radiating 2,075 times the Sun's luminosity from its photosphere at an effective temperature of 19,616 K.[1]