HD 31093
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 51m 28.21644s[2] |
| Declination | −34° 54′ 22.6341″[2] |
| Apparent magnitude (V) | 5.83±0.01[3] |
| Characteristics | |
| Spectral type | A1V + A4V[4] |
| U−B color index | +0.09[5] |
| B−V color index | +0.08[5] |
| Astrometry | |
| Radial velocity (Rv) | +24±1.8[6] km/s |
| Proper motion (μ) | RA: 24.90±0.33[2] mas/yr Dec.: −22.68±0.48[2] mas/yr |
| Parallax (π) | 12.17±0.41 mas[2] |
| Distance | 268 ± 9 ly (82 ± 3 pc) |
| Absolute magnitude (MV) | +1.25[1] (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[4]° |
| Longitude of the node (Ω) | 20±2[4]° |
| Argument of periastron (ω) (secondary) | 109±2[4]° |
| Details | |
| HD 31093 A | |
| Mass | 1.85 ± 0.21[4] M☉ |
| HD 31093 B | |
| Mass | 1.58 ± 0.18[4] M☉ |
| Other designations | |
| 19 G. Caeli[8], CD−35°1962, CPD−35°551, FK5 2364, GC 5939, HD 31093, HIP 22573, HR 1559, SAO 195357, WDS J04515-3454AB[9] | |
| 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,[3] 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.[2] They appear to be receding from the Solar System with a heliocentric radial velocity of 24 km/s.[6]
This star was designated Eta1 Caeli by Johann Elert Bode in his 1801 Urnaographia, but this is now no longer used.[10]
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☉.[4] They take 43 years to circle each other in an eccentric orbit.[7]
