8 Herculis

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8 Herculis
Hercules constellation map.svg
Red circle.svg
Location of 8 Herculis (circled in red)
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Hercules [1]
Right ascension 16h 08m 46.6312s [2]
Declination +17° 12′ 20.292″ [2]
Apparent magnitude  (V)+6.13 [1]
Characteristics
Evolutionary stage main sequence [3]
Spectral type A0Vnn [3]
B−V color index −0.003±0.005 [1]
Astrometry
Radial velocity (Rv)−17.0±4.3 [1] km/s
Proper motion (μ)RA: −18.098(35) mas/yr [2]
Dec.: −31.408(43) mas/yr [2]
Parallax (π)8.1684±0.0430  mas [2]
Distance 399 ± 2  ly
(122.4 ± 0.6  pc)
Absolute magnitude  (MV)+1.18 [1]
Details
Mass 2.52 [4]   M☉
Radius 2.54 [4]   R☉
Luminosity 55 [4]   L☉
Surface gravity (log g)4.03 [4]   cgs
Temperature 9,863 [4]   K
Metallicity [Fe/H]+0.10 [5]   dex
Rotational velocity (v sin i)259 [3]  km/s
Age 317 [6]   Myr
Other designations
8 Her, BD+17°2967, HD 145122, HIP 79102, SAO 101962 [7]
Database references
SIMBAD data

8 Herculis or 8 Her is an A-type main-sequence star 399 light-years (122.4 parsecs ) away in the constellation Hercules. It is also known as HD 145122. Because of its apparent magnitude, of 6.13 the star can be very faintly seen with the naked eye in excellent conditions.

Stellar properties

8 Herculis is a main-sequence star of spectral type A0Vnn. The nn indicates extremely nebulous spectral lines due to its rapid rotation. The star has about 2.5 times the mass, 2.5 times the radius, and 55 times the luminosity of the Sun. The star appears to have a similar metallicity to the Sun. At 317 million years old, it is modelled to be about 40% of the way through its main sequence life. [3]

References

  1. 1 2 3 4 5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  4. 1 2 3 4 5 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 .
  5. ↑ Huson, Dylan; Cowan, Indiana; Sizemore, Logan; Kounkel, Marina; Hutchinson, Brian (2025). "Gaia Net: Toward Robust Spectroscopic Parameters of Stars of all Evolutionary Stages". The Astrophysical Journal. 984 (1): 58. arXiv: 2503.02958 . Bibcode:2025ApJ...984...58H. doi: 10.3847/1538-4357/adc2fa .
  6. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
  7. ↑ "8 Her". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-10-14.
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