Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Caelum |
Right ascension | 04h 51m 28.21644s[1] |
Declination | −34° 54′ 22.6341″[1] |
Apparent magnitude (V) | 5.83±0.01[2] |
Characteristics | |
Spectral type | A1V + A4V[3] |
U−B color index | +0.09[4] |
B−V color index | +0.08[4] |
Astrometry | |
Radial velocity (Rv) | +24±1.8[5] km/s |
Proper motion (μ) | RA: 24.90±0.33[1] mas/yr Dec.: −22.68±0.48[1] mas/yr |
Parallax (π) | 12.17 ± 0.41 mas[1] |
Distance | 268 ± 9 ly (82 ± 3 pc) |
Absolute magnitude (MV) | +1.25[6] (combined) |
Orbit | |
Period (P) | 43.36±4.34[7] yr |
Semi-major axis (a) | 0.248±0.015[7]″ |
Eccentricity (e) | 0.852[7] |
Inclination (i) | 107±1[3]° |
Longitude of the node (Ω) | 20±2[3]° |
Argument of periastron (ω) (secondary) | 109±2[3]° |
Details | |
HD 31093 A | |
Mass | 1.85 ± 0.21[3] M☉ |
HD 31093 B | |
Mass | 1.58 ± 0.18[3] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
HD 31093, also known as HR 1559, is a visual binary located in the southern constellation Caelum, the chisel. The components have a combined apparent magnitude of 5.83,[2] making it faintly visible to the naked eye. Based on parallax measurements from the Hipparcos spacecraft, the system is estimated to be 268 light years distant.[1] They appear to be receding from the Solar System with a heliocentric radial velocity of 24 km/s.[5]
The components have stellar classifications of A1 and A4 V, indicating that both of them are A-type main-sequence stars. Since the components have a separation of 1⁄4 arcseconds, it is difficult to distinguish individually through a telescope. The primary has a mass 1.85 times that of the Sun while the secondary has a mass of 1.58 M☉.[3] They take 43 years to circle each other in an eccentric orbit.[7]
van Leeuwen2007
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