HD 43587
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| HD 43587 Aab | |
| Right ascension | 06h 17m 16.139s |
| Declination | +05° 06′ 00.40″ |
| Apparent magnitude (V) | 5.70 |
| HD 43587 BC | |
| Right ascension | 06h 17m 10.65s |
| Declination | +05° 07′ 02.4″ |
| Apparent magnitude (V) | 13.27 (BC total) |
| Characteristics | |
| Spectral type | G0V / M0V / M3.5V / M5V |
| B−V color index | 0.610(system total) |
| Astrometry | |
| HD 43587 Aa | |
| Radial velocity (Rv) | 8.96±0.10 km/s |
| Proper motion (μ) | RA: −187.72±0.37 mas/yr Dec.: +170.69±0.28 mas/yr |
| Parallax (π) | 51.95±0.40 mas |
| Distance | 62.8 ± 0.5 ly (19.2 ± 0.1 pc) |
| HD 43587 BC | |
| Proper motion (μ) | RA: -198 mas/yr Dec.: 164 mas/yr |
| Parallax (π) | 55.2 ± 1.0 mas |
| Distance | 59 ± 1 ly (18.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 12.07 / 14.90 |
| Orbit | |
| Primary | HD 43587 Aa |
| Companion | HD 43587 Ab |
| Period (P) | 32.07 years |
| Semi-major axis (a) | 0.598″ |
| Eccentricity (e) | 0.796 |
| Inclination (i) | 35.6° |
| Longitude of the node (Ω) | 163.1° |
| Periastron epoch (T) | 1998.05 |
| Argument of periastron (ω) (secondary) | 75.0° |
| Semi-amplitude (K1) (primary) | 4.323±0.009 km/s |
| Position (relative to HD 43587 B) | |
| Component | HD 43587 C |
| Epoch of observation | 2453376.0 |
| Angular distance | 366±3 mas |
| Position angle | 158±1° |
| Details | |
| Mass | 1.049±0.016 / 0.67±0.04 / 0.25±0.06 / 0.12±0.02 M☉ |
| Radius | 1.15±0.01 R☉ |
| Surface gravity (log g) | 4.30±0.01 cgs |
| Temperature | 5,947±17 K |
| Metallicity [Fe/H] | −0.02±0.02 dex |
| Age | 4.97±0.52 Gyr |
| Other designations | |
| HIP 29860, Gliese 231.1, GJ 9208, HR 2251 | |
| HD 43587 Aab: WDS J06173+0506Aa,Ab, LEP 24A | |
| HD 43587 BC: NLTT 16333, WDS J06173+0506E, LEP 24AE | |
| Database references | |
| SIMBAD | data |
HD 43587 is a stellar system approximately 63 light-years away in the constellation of Orion, visible to the naked eye. The system comprises four individual stars, with two widely separated binaries forming a quadruple system.