Delta Arae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 31m 05.91272s |
| Declination | −60° 41′ 01.8522″ |
| Apparent magnitude (V) | 3.62 |
| Characteristics | |
| Spectral type | B8 Vn + G8 V |
| U−B color index | −0.31 |
| B−V color index | −0.10 |
| Astrometry | |
| Radial velocity (Rv) | +10 km/s |
| Proper motion (μ) | RA: −54.01 mas/yr Dec.: −99.25 mas/yr |
| Parallax (π) | 16.48±0.34 mas |
| Distance | 198 ± 4 ly (61 ± 1 pc) |
| Absolute magnitude (MV) | −0.31 |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 2.46697±0.00500 yr |
| Semi-major axis (a) | 52.0±0.2 mas |
| Eccentricity (e) | 0.7380±0.0264 |
| Inclination (i) | 90.32±0.97° |
| Longitude of the node (Ω) | 127.13±0.91° |
| Argument of periastron (ω) (secondary) | 347.80±1.05° |
| Details | |
| δ Ara A | |
| Mass | 3.44±0.01 M☉ |
| Radius | 3.12±0.15 R☉ |
| Luminosity | 214 L☉ |
| Surface gravity (log g) | 3.81±0.06 cgs |
| Temperature | 12,549 K |
| Rotational velocity (v sin i) | 255 km/s |
| Age | 125 Myr |
| δ Ara B | |
| Mass | 2.03±0.01 M☉ |
| Temperature | 9,161 K |
| Other designations | |
| δ Ara, CPD−60°6842, FK5 648, GC 23681, HD 158094, HIP 85727, HR 6500, SAO 253945, PPM 362756, WDS J17311-6041A | |
| Database references | |
| SIMBAD | data |
Delta Arae is a binary star in the southern constellation Ara. Its name is a Bayer designation that is Latinized from δ Arae, and abbreviated Delta Ara or δ Ara. This system has an apparent visual magnitude of 3.62 and is visible to the naked eye as a point of light. Based upon an annual parallax of 16.48 mas, it is about 198 light-years (61 parsecs) distant from the Earth.