HD 169405
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 26m 54.01379s |
| Declination | −48° 07′ 02.0638″ |
| Apparent magnitude (V) | +5.44 |
| Characteristics | |
| Spectral type | K0.5III + F/G |
| B−V color index | 0.855±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +2.11±3.42 km/s |
| Proper motion (μ) | RA: +3.041±0.182 mas/yr Dec.: −54.895±0.169 mas/yr |
| Parallax (π) | 12.2045±0.2664 mas |
| Distance | 267 ± 6 ly (82 ± 2 pc) |
| Absolute magnitude (MV) | 1.14 |
| Details | |
| Mass | 2.4 M☉ |
| Radius | 9.8 R☉ |
| Luminosity | 35 L☉ |
| Surface gravity (log g) | 2.94 cgs |
| Temperature | 5,062 K |
| Metallicity [Fe/H] | +0.04 dex |
| Rotational velocity (v sin i) | 2.7±1.7 km/s |
| Age | 557 Myr |
| Other designations | |
| CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021 | |
| Database references | |
| SIMBAD | data |
HD 169405 (HR 6894), is a suspected binary star system in the southern constellation Telescopium, about a degree to the north of Zeta Telescopii. It has an apparent magnitude of 5.44, making it faintly visible to the naked eye under ideal conditions. HD 169405 is located at a distance of 267 light years and is drifting away with a heliocentric radial velocity of 3.8 km/s.
The visible component has a spectral classification K0.5III which indicates that it is an evolved star between a K0 and K1 giant. It has expanded to ten times the Sun's radius, shines at 35 solar luminosities, and has an effective temperature of 5,062 K. This temperature gives it the yellowish-orange glow of a K-type star, and it spins slowly with a projected rotational velocity of 2.7 km/s.