Alpha Caeli
Star in the constellation Caelum / From Wikipedia, the free encyclopedia
Alpha Caeli (α Cae, α Caeli) is a double star system in the constellation Caelum.
Quick Facts Apparent magnitude (V), Characteristics ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Caelum |
A | |
Right ascension | 04h 40m 33.7125s |
Declination | −41° 51′ 49.509″[1] |
Apparent magnitude (V) | 4.456 |
B | |
Right ascension | 04h 40m 34.0s |
Declination | −41° 51′ 51″[2] |
Apparent magnitude (V) | 12.5[2] |
Characteristics | |
A | |
Spectral type | F2V[3] |
U−B color index | +0.01[4] |
B−V color index | +0.34[4] |
B | |
Spectral type | M0.5[2] |
Astrometry | |
A | |
Radial velocity (Rv) | –0.6 ± 0.9[5] km/s |
Proper motion (μ) | RA: –141.18[1] mas/yr Dec.: –74.95[1] mas/yr |
Parallax (π) | 49.67 ± 0.53 mas[1] |
Distance | 65.7 ± 0.7 ly (20.1 ± 0.2 pc) |
Absolute magnitude (MV) | 3.39[6] |
B | |
Radial velocity (Rv) | −0.6 ± 0.9[2] km/s |
Proper motion (μ) | RA: −147[2] mas/yr Dec.: −78[2] mas/yr |
Details | |
A | |
Mass | 1.48[7] M☉ |
Radius | 1.3[8] R☉ |
Surface gravity (log g) | 4.01[3] cgs |
Temperature | 6,991[3] K |
Metallicity [Fe/H] | −0.10[3] dex |
Rotational velocity (v sin i) | 47.8±2.4[9] km/s |
Age | 0.9 (0.7–1.3)[7] Gyr |
B | |
Mass | 0.3[10] M☉ |
Temperature | 3,800[10] K |
Other designations | |
Database references | |
SIMBAD | A |
B |
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