| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h38m 53.55015s[1] |
| Declination | −12° 07′ 23.0681″[1] |
| Apparent magnitude (V) | 4.99[2] (5.19 + 7.22)[3] |
| Characteristics | |
| Spectral type | A0 V(A1 + F2)[2] |
| B−V color index | 0.074±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | +2.9±0.8[5] km/s |
| Proper motion (μ) | RA: −60.614[1] mas/yr Dec.: −16.417[1] mas/yr |
| Parallax (π) | 14.2348 ± 0.3656 mas[1] |
| Distance | 229 ± 6 ly (70 ± 2 pc) |
| Absolute magnitude (MV) | 0.73[4] |
| Orbit[2] | |
| Period (P) | 40.9±1.386 yr |
| Semi-major axis (a) | 0.2844±0.0055″ |
| Eccentricity (e) | 0.759±0.180 |
| Inclination (i) | 75.5±2.2° |
| Longitude of the node (Ω) | 152.0±1.8° |
| Periastron epoch (T) | 2003.805 |
| Argument of periastron (ω) (secondary) | 284.1±11.0° |
| Details | |
| HD 29573 A | |
| Mass | 2.28[2] M☉ |
| Luminosity | 51.8+4.6 −4.3[6] L☉ |
| Temperature | 8,892+103 −102[6] K |
| Rotational velocity (v sin i) | 27[6] km/s |
| HD 29573 B | |
| Mass | 1.56[2] M☉ |
| Other designations | |
BD−12° 955, GJ 9161, HD 29573, HIP 21644, HR 1483, SAO 149789, WDS J04389-1207AB[7] | |
| Database references | |
| SIMBAD | data |
HD 29573 is a binary star[3] system in the constellation Eridanus. It has a combined apparent visual magnitude of 4.99,[2] making it visible to the naked eye. Based upon an annual parallax shiftof14.23 mas,[1] it is located 229 light years from the Sun. The system is moving further away from Earth with a heliocentric radial velocity of +3 km/s.[5]
The binary nature of this system was discovered through observations made with the Hipparcos spacecraft. The pair orbit each other with a period of 41 years and an eccentricity of 0.8.[2] The magnitude 5.19[3] primary component has a class of A1,[2] 2.28[2] times the mass of the Sun, and is a suspected chemically peculiar star.[8] The secondary has magnitude 7.22,[3] 1.56[2] times the Sun's mass, and a class of F2.[2] The system has a possible infrared excess[9] due to circumstellar dust.[10]
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