98 Herculis information

98 Herculis
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	18h 06m 01.90000s
Declination	+22° 13′ 07.9396″
Apparent magnitude (V)	4.96
Characteristics
Spectral type	M3-SIII or M3IIIBa0.2
B−V color index	1.656±0.062
Variable type	suspected
Astrometry
Radial velocity (Rv)	−19.48±0.21 km/s
Proper motion (μ)	RA: −12.028 mas/yr ; Dec.: −6.067 mas/yr
Parallax (π)	5.5201 ± 0.1610 mas
Distance	590 ± 20 ly ; (181 ± 5 pc)
Absolute magnitude (MV)	−1.78
Details
Radius	85.39+10.72; −8.50 R☉
Luminosity	1,329.7±44.7 L☉
Temperature	3,772+203; −217 K
Other designations
	98 Her, NSV 10208, BD+22°3273, HD 165625, HIP 88657, HR 6765, SAO 85725
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]

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference lu1991 was invoked but never defined (see the help page).
^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
^ Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
^ Cite error: The named reference gomez1997 was invoked but never defined (see the help page).
^ Cite error: The named reference Percy1992 was invoked but never defined (see the help page).

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[perkins1989-3] Cite error: The named reference perkins1989 was invoked but never defined (see the help page).

[lu1991-4] Cite error: The named reference lu1991 was invoked but never defined (see the help page).

[gcvs-5] Cite error: The named reference gcvs was invoked but never defined (see the help page).

[SIMBAD-6] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Eggleton2008-7] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

[Famaey2005-8] Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).

[Eggen1992-9] Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).

[gomez1997-10] Cite error: The named reference gomez1997 was invoked but never defined (see the help page).

[Percy1992-11] Cite error: The named reference Percy1992 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	18^h 06^m 01.90000^s^[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 (R_v)	−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 (M_V)	−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
98 Her, NSV 10208, BD+22°3273, HD 165625, HIP 88657, HR 6765, SAO 85725^[6]
Database references
SIMBAD	data

98 Herculis information

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