HD 177693
K-type giant in the constellation Telescopium / From Wikipedia, the free encyclopedia
HD 177693 (HR 7233; 48 G. Telescopii) is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.45,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 376 light-years,[1] and it is drifting closer with a heliocentric radial velocity of −20.9 km/s.[6] At its current distance, HD 177693's brightness is diminished by 0.24 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of +1.03.[7]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium |
Right ascension | 19h 08m 52.32474s[1] |
Declination | −55° 43′ 13.5297″[1] |
Apparent magnitude (V) | 6.45±0.01[2] |
Characteristics | |
Spectral type | K1 III[3] or K1 IV[4] |
B−V color index | +1.10[5] |
Astrometry | |
Radial velocity (Rv) | −20.9±2.9[6] km/s |
Proper motion (μ) | RA: +56.586 mas/yr[1] Dec.: −115.876 mas/yr[1] |
Parallax (π) | 8.6669 ± 0.0269 mas[1] |
Distance | 376 ± 1 ly (115.4 ± 0.4 pc) |
Absolute magnitude (MV) | +1.03[7] |
Details | |
Mass | 1.25[8] M☉ |
Radius | 10.6[9] R☉ |
Luminosity | 50.2+0.4 −0.3[1] L☉ |
Surface gravity (log g) | 2.52[8] cgs |
Temperature | 4,750±122[10] K |
Metallicity [Fe/H] | −0.10[8] dex |
Rotational velocity (v sin i) | <1.3[11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 177693 has a stellar classification of K1 III,[3] indicating that it is an evolved orange giant. David Stanley Evans gave a less evolved class of K1 IV,[4] instead indicating that it is a slightly evolved subgiant. It has 1.25 times the mass of the Sun[8] but it has expanded to 10.6 times the radius of the Sun.[9] It radiates 50.2 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,750 K.[10] HD 177693 is slightly metal deficient with an iron abundance of [Fe/H] = −0.10[8] and it spins with a projected rotational velocity lower than 1.3 km/s.[11]