HD 169405
Star in the constellation Telescopium
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HD 169405 (HR 6894), is a suspected binary star[8] system in the southern constellation Telescopium, about a degree to the north of Zeta Telescopii.[9] It has an apparent magnitude of 5.44,[3] making it faintly visible to the naked eye under ideal conditions. HD 169405 is located at a distance of 267 light years[2] and is drifting away with a heliocentric radial velocity of 3.8 km/s.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Telescopium[1] |
| Right ascension | 18h 26m 54.01379s[2] |
| Declination | −48° 07′ 02.0638″[2] |
| Apparent magnitude (V) | +5.44[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K0.5III + F/G[4] |
| B−V color index | 0.855±0.004[3] |
| Astrometry | |
| Radial velocity (Rv) | +2.11±3.42[2] km/s |
| Proper motion (μ) | RA: +3.041±0.182[2] mas/yr Dec.: −54.895±0.169[2] mas/yr |
| Parallax (π) | 12.2045±0.2664 mas[2] |
| Distance | 267 ± 6 ly (82 ± 2 pc) |
| Absolute magnitude (MV) | 1.14[5] |
| Details | |
| Mass | 2.4[5] M☉ |
| Radius | 9.8[2] R☉ |
| Luminosity | 35[5] L☉ |
| Surface gravity (log g) | 2.94[5] cgs |
| Temperature | 5,062[5] K |
| Metallicity [Fe/H] | +0.04[5] dex |
| Rotational velocity (v sin i) | 2.7±1.7[6] km/s |
| Age | 557[2] Myr |
| Other designations | |
| CD−48°12505, GC 25150, HD 169405, HIP 90414, HR 6894, SAO 229021[7] | |
| Database references | |
| SIMBAD | data |
The visible component has a spectral classification K0.5III[4] 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.[5] 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.[6]