98 Herculis

98 Herculis
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]
Distance590 ± 20 ly
(181 ± 5 pc)
Absolute magnitude (MV)−1.78[2]
Details
Radius85.39+10.72
−8.50[1] R☉
Luminosity1,329.7±44.7[1] L☉
Temperature3,772+203
−217[1] K
Other designations
98 Her, NSV 10208, BD+22°3273, HD 165625, HIP 88657, HR 6765, SAO 85725[6]
Database references
SIMBADdata

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]

  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).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference lu1991 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference gomez1997 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Percy1992 was invoked but never defined (see the help page).