HD 167257
Star in the constellation Telescopium
From Wikipedia, the free encyclopedia
HD 167257 (HR 6821) is a solitary star in the southern constellation Telescopium. It has an apparent magnitude of 6.05,[3] making it faintly visible to the naked eye. Parallax measurements place the star at a distance of 420 light years[2] and has a radial velocity of −5.1 km/s,[7] which is poorly constrained. This indicates that it is drifting towards the Solar System.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium[1] |
| Right ascension | 18h 17m 00.9195s[2] |
| Declination | –51° 04′ 05.7597″[2] |
| Apparent magnitude (V) | 6.05±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B9V[5] |
| B−V color index | −0.06[6] |
| Astrometry | |
| Radial velocity (Rv) | −5.1±4.3[7] km/s |
| Proper motion (μ) | RA: +1.260 mas/yr[2] Dec.: −9.497 mas/yr[2] |
| Parallax (π) | 7.7579±0.0512 mas[2] |
| Distance | 420 ± 3 ly (128.9 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.64[1] |
| Details | |
| Mass | 2.63±0.06[4] M☉ |
| Radius | 2.8±0.1[8] R☉ |
| Luminosity | 64.6+7.7 −8.7[4] L☉ |
| Surface gravity (log g) | 3.97±0.06[8] cgs |
| Temperature | 10,139[9] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 61[11] km/s |
| Age | 239[10] Myr |
| Other designations | |
| 7 G. Telescopii, CD–51°11460, CPD−51°10795, GC 24909, HD 167257, HIP 89597, HR 6821, SAO 245372 | |
| Database references | |
| SIMBAD | data |
HD 167257 has a stellar classification of B9 V,[5] indicating that it is an ordinary B-type main-sequence star. It has 2.63 times the mass of the Sun,[4] and 2.8 times the radius of the Sun.[8] It shines with a luminosity of about 65 L☉[4] from its photosphere at an effective temperature of 10,139 K,[9] giving it a bluish white hue. HD 167257 is estimated to be about 240 million years old[10] – 58.6% through its main sequence lifetime[4] – and spins modestly with a projected rotational velocity of 61 km/s;[11] it has a solar metallicity.[10]