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