HR 4049
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h 18m 07.59s |
| Declination | −28° 59′ 31.2″ |
| Apparent magnitude (V) | 5.29 – 5.83 |
| Characteristics | |
| Evolutionary stage | Post-AGB + main sequence |
| Spectral type | B9.5Ib-II |
| B−V color index | +0.24 |
| Variable type | unique |
| Astrometry | |
| Radial velocity (Rv) | −30.12±0.09 km/s |
| Proper motion (μ) | RA: −16.290 mas/yr Dec.: +10.720 mas/yr |
| Parallax (π) | 0.7107±0.0984 mas |
| Distance | approx. 4,600 ly (approx. 1,400 pc) |
| Orbit | |
| Period (P) | 428.474±0.002 days |
| Eccentricity (e) | 0.29±0.01 |
| Inclination (i) | 60–75° |
| Periastron epoch (T) | 2,458,383.2±0.6 HJD |
| Argument of periastron (ω) (secondary) | 242.3±0.3° |
| Semi-amplitude (K1) (primary) | 15.52±0.13 km/s |
| Details | |
| A | |
| Mass | 0.75±0.05 M☉ |
| Radius | 76 ± 11 R☉ |
| Luminosity | 16,600+5,300 −4,000 L☉ |
| Surface gravity (log g) | +1.0±0.5 cgs |
| Temperature | 7,500±500 K |
| Metallicity [Fe/H] | −4.5 dex |
| B | |
| Mass | 0.70–0.82 M☉ |
| Radius | 0.6 R☉ |
| Luminosity | 0.06 L☉ |
| Surface gravity (log g) | 4.6 cgs |
| Temperature | 3,500 K |
| Other designations | |
| AG Antliae, CD−28°8070, 2MASS J10180758-2859308, GSC 06630-01759, HD 89353, FK5 1265, PPM 257470, HIP 50456, SAO 178644, HR 4049 | |
| Database references | |
| SIMBAD | data |
HR 4049, also known as HD 89353 and AG Antliae, is a binary post-asymptotic-giant-branch (post-AGB) star in the constellation Antlia. A very metal-poor star, it is surrounded by a thick unique circumbinary disk enriched in several molecules. With an apparent magnitude of about 5.5, the star can readily be seen with the naked eye under ideal conditions. It is located approximately 1,400 parsecs (4,600 ly) distant.