Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium |
Right ascension | 18h 52m 27.2298s[1] |
Declination | −46° 35′ 42.4326″[1] |
Apparent magnitude (V) | 5.49±0.01[2] |
Characteristics | |
Spectral type | M0 III[3] |
B−V color index | +1.63[4] |
Variable type | suspected[5] |
Astrometry | |
Radial velocity (Rv) | −28.1±0.9[6] km/s |
Proper motion (μ) | RA: +28.229 mas/yr[1] Dec.: −0.941 mas/yr[1] |
Parallax (π) | 4.0175 ± 0.1091 mas[1] |
Distance | 810 ± 20 ly (249 ± 7 pc) |
Absolute magnitude (MV) | −1.97[7] |
Details | |
Mass | 1.14[8] M☉ |
Radius | 82.63[9] R☉ |
Luminosity | 902[10] L☉ |
Surface gravity (log g) | 0.79[8] cgs |
Temperature | 3929±122[11] K |
Metallicity [Fe/H] | −0.04[8] dex |
Other designations | |
Database references | |
SIMBAD | data |
HD 174387 (HR 7092) is a solitary[14] star in the southern constellation Telescopium. With an apparent magnitude of 5.49,[2] it is faintly visible to the naked eye if viewed under dark skies. Parallax measurements put the object at a distance of 810 light years[1] and it is currently approaching the Solar System with a heliocentric radial velocity of −28.1 km/s.[6]
HD 174387 has a stellar classification of M0 III,[3] indicating that it is an ageing red giant. Due to its evolved state, the star has expanded to a diameter of 82.63 R☉.[9] At present it has 114% the mass of the Sun[8] and shines 902 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 3,929 K,[11] giving a red hue when viewed. HD 174387's metallicity is estimated to be 91% that of the Sun.[8] The star is suspected to be variable, ranging from magnitudes 5.59 to 5.63 in the Hipparcos passband.[5]