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 | |
Evolutionary stage | AGB |
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 |
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]
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]
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 | |
Evolutionary stage | AGB |
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 |
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]
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]