Alpha Caeli

α Caeli
Location of α Caeli in Caelum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Caelum
A
Right ascension 04h 40m 33.7125s[1]
Declination −41° 51′ 49.5045″[1]
Apparent magnitude (V) 4.456[2] (4.44–4.47[3])
B
Right ascension 04h 40m 34.17s[4]
Declination −41° 51′ 54.7″[4]
Apparent magnitude (V) 12.5[5]
Characteristics
A
Evolutionary stage F-type main-sequence star
Spectral type F2V[6]
Apparent magnitude (U) 4.79[1]
Apparent magnitude (B) 4.79[1]
Apparent magnitude (R) 4.11[1]
Apparent magnitude (G) 4.35[1]
Apparent magnitude (I) 3.9[1]
Apparent magnitude (J) 3.944±0.354[1]
Apparent magnitude (H) 3.654±0.292[1]
Apparent magnitude (K) 3.724±0.324[1]
U−B color index 0.01[7]
B−V color index +0.34[2]
Variable type suspected Delta Scuti[8]
B
Evolutionary stage Red dwarf
Spectral type M0.5V[6]
Variable type Flare star[9]
Astrometry
A
Radial velocity (Rv)0.65±0.3[10] km/s
Proper motion (μ) RA: –139.843 mas/yr[10]
Dec.: –75.677 mas/yr[10]
Parallax (π)49.062 ± 0.00937 mas[10]
Distance66.48 ± 0.01 ly
(20.382 ± 0.004 pc)[10]
Absolute magnitude (MV)2.93±0.01[11]
B
Radial velocity (Rv)−0.6±0.9[4] km/s
Proper motion (μ) RA: −147[4] mas/yr
Dec.: −78[4] mas/yr
Absolute magnitude (MV)9.8[12]
Orbit[5]
PrimaryA
CompanionB
Period (P)460,000 days
(1,260 years)
Semi-major axis (a)133.1 AU
Details
A
Mass1.54[13] M☉
Radius1.546[14] R☉
Luminosity5.156[14] L☉
Surface gravity (log g)4.12[10] cgs
Temperature7,002[14] K
Metallicity [Fe/H]−0.06±0.06[13] dex
Rotation1.4[15] days
Rotational velocity (v sin i)47[16] km/s
Age1.5[13] Gyr
B
Radius0.45[17][a] R☉
Temperature3,355[17] K
Position (relative to A)[18]
ComponentB
Epoch of observation2008
Angular distance6.6″
Other designations
Gliese 174.1, Gaia DR2 4815660547961306112, Gaia DR3 4815660547961306112, GJ 9164, HD 29875, HIP 21770, HR 1502, PPM 308904, WDS J04406-4152A, TIC 77263680, TYC 7589-1693-1, GSC 07589-01693, IRAS 04389-4157, 2MASS J04403374-4151495, WISE J044033.59-415150.2
Database references
SIMBADA
B

Alpha Caeli (α Cae, α Caeli) is the brightest star in the constellation Caelum. It is in fact a binary star, made up of a F-type star of magnitude 4.46 and a red dwarf of magnitude 12.5. They are separated by 6.6" in the sky. Parallax measurements by the Gaia spacecraft imply a distance of 20.4 pc (67 ly) to Alpha Caeli. A debris disk has been detected around the primary component of the system.

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