HD 156768
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| A | |
| Right ascension | 17h 22m 55.22140s |
| Declination | −58° 00′ 37.1789″ |
| Apparent magnitude (V) | 6.1 |
| B | |
| Right ascension | 17h 22m 55.20446s |
| Declination | −58° 00′ 38.9718″ |
| Apparent magnitude (V) | 9.6 |
| Characteristics | |
| A | |
| Spectral type | G8Ib/II |
| U−B color index | +0.86 |
| B−V color index | +1.07 |
| B | |
| B−V color index | +0.39 |
| Astrometry | |
| Absolute magnitude (MV) | −1.69 |
| A | |
| Radial velocity (Rv) | −9.42±0.13 km/s |
| Proper motion (μ) | RA: −5.959 mas/yr Dec.: −15.651 mas/yr |
| Parallax (π) | 3.1386±0.0412 mas |
| Distance | 1,040 ± 10 ly (319 ± 4 pc) |
| B | |
| Radial velocity (Rv) | −9.80±0.20 km/s |
| Proper motion (μ) | RA: −6.006 mas/yr Dec.: −14.316 mas/yr |
| Parallax (π) | 2.9305 ± 0.0404 mas |
| Distance | 1,110 ± 20 ly (341 ± 5 pc) |
| Details | |
| HD 156768 A | |
| Mass | 4.5 M☉ |
| Radius | 37 R☉ |
| Luminosity | 527 L☉ |
| Surface gravity (log g) | 1.76 cgs |
| Temperature | 4,580 K |
| Rotational velocity (v sin i) | 2.6±1.0 km/s |
| HD 156768 B | |
| Mass | 1.6 M☉ |
| Surface gravity (log g) | 3.79 cgs |
| Temperature | 6,592 K |
| Metallicity [Fe/H] | −0.11 dex |
| Other designations | |
| CPD−57°8478, HD 156768, HIP 85049, HR 6438, SAO 244678 | |
| Database references | |
| SIMBAD | data |
HD 156768 is a double star in the southern constellation of Ara, with a combined apparent magnitude of 5.86. The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II. The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.