Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 00m 03.41611s[1] |
Declination | +16° 45′ 03.2855″[1] |
Apparent magnitude (V) | 4.67[2] |
Characteristics | |
Spectral type | K0.5IIb[3] |
B−V color index | 1.254±0.007[2] |
Astrometry | |
Radial velocity (Rv) | −24.47±0.20[4] km/s |
Proper motion (μ) | RA: −6.878[1] mas/yr Dec.: −9.696[1] mas/yr |
Parallax (π) | 4.5894 ± 0.3311 mas[1] |
Distance | 710 ± 50 ly (220 ± 20 pc) |
Absolute magnitude (MV) | −1.85[2] |
Details | |
Radius | 50.53+1.41 −1.39[1] R☉ |
Luminosity | 919±74[1] L☉ |
Surface gravity (log g) | 1.8[5] cgs |
Temperature | 4,471+63 −61[1] K |
Metallicity [Fe/H] | −0.22[5] dex |
Other designations | |
Database references | |
SIMBAD | data |
93 Herculis is a star located around 750[1] light years away from the Sun in the northern constellation of Hercules.[6] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.67[2] The brightness of the star is diminished by an extinction of 0.21 due to interstellar dust.[7] It is moving closer to the Earth with a heliocentric radial velocity of −24.5 km/s.[4] This star, together with 95 Her, 102 Her, and 109 Her, made up the obsolete constellation Cerberus.[8]
This object has a stellar classification of K0.5IIb,[3] which indicates it is an evolved bright giant. With the supply of hydrogen at its core exhausted, the star has expanded to 51[1] times the Sun's radius. It is radiating around 919[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,471 K.[1] It is generally deficient in metal elements, but appears weakly enhanced in barium and other heavier elements.[5] This is a suspected barium star and hence may have a white dwarf companion in orbit.[9]