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