98 Herculis is a single[7] star located approximately 590[1] light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude of 4.96.[2] The brightness of the star is diminished by an extinction of 0.19 due to interstellar dust.[8] The star is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 18h 06m 01.90000s[1] |
Declination | +22° 13′ 07.9396″[1] |
Apparent magnitude (V) | 4.96[2] |
Characteristics | |
Spectral type | M3-SIII[3] or M3IIIBa0.2[4] |
B−V color index | 1.656±0.062[2] |
Variable type | suspected[5] |
Astrometry | |
Radial velocity (Rv) | −19.48±0.21[2] km/s |
Proper motion (μ) | RA: −12.028[1] mas/yr Dec.: −6.067[1] mas/yr |
Parallax (π) | 5.5201 ± 0.1610 mas[1] |
Distance | 590 ± 20 ly (181 ± 5 pc) |
Absolute magnitude (MV) | −1.78[2] |
Details | |
Radius | 85.39+10.72 −8.50[1] R☉ |
Luminosity | 1,329.7±44.7[1] L☉ |
Temperature | 3,772+203 −217[1] K |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging red giant star on the asymptotic giant branch[9] with a stellar classification of M3-SIII,[3] where the suffix notation indicating this is an S-type star. It is a mild barium star with an intensity class of 0.2,[10][4] and is a suspected variable star, although Percy and Shepherd (1992) were unable to confirm this.[11] With the hydrogen at its core exhausted, the star has expanded to around 85[1] times the Sun's radius. It is radiating 1,330[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,772 K.[1]