IRAS 08544−4431
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 56m 14.181s |
| Declination | −44° 43′ 10.71″ |
| Apparent magnitude (V) | 9.01 - 9.19 |
| Characteristics | |
| Spectral type | F3e |
| Variable type | RV |
| Astrometry | |
| Radial velocity (Rv) | +62.5 km/s |
| Proper motion (μ) | RA: −7.8 mas/yr Dec.: +9.5 mas/yr |
| Parallax (π) | 0.6551±0.0767 mas |
| Distance | approx. 5,000 ly (approx. 1,500 pc) |
| Orbit | |
| Period (P) | 506.0±1.3 d |
| Eccentricity (e) | 0.22±0.02 |
| Inclination (i) | 20±7.5° |
| Argument of periastron (ω) (secondary) | 41.7±6.3° |
| Semi-amplitude (K1) (primary) | 87±0.2 km/s |
| Details | |
| A | |
| Mass | 0.65 M☉ |
| Radius | 75 R☉ |
| Luminosity | 14,000 L☉ |
| Surface gravity (log g) | 1.5 cgs |
| Temperature | 7,250 K |
| Metallicity [Fe/H] | −0.5 dex |
| B | |
| Mass | 1.15 M☉ |
| Temperature | 4,000 K |
| Other designations | |
| V390 Velorum, CD−44 4961, IRAS 08544−4431, 2MASS J08561419−4443107 | |
| Database references | |
| SIMBAD | data |
IRAS 08544−4431 is a binary system surrounded by a dusty ring in the constellation of Vela. The system contains an RV Tauri variable star and a more massive but much less luminous companion.