Star in the constellation Hercules
102 Herculis
Observation dataEpoch J2000 Equinox J2000
Constellation
Hercules
Right ascension
18 08 45.49142
Declination
+20° 48′ 52.4079″
Apparent magnitude (V)
4.37
Characteristics
Spectral type
B2 IV or B2 V
B−V color index
−0.164±0.013
Astrometry Radial velocity (Rv )−14.9±0.6 km/s Proper motion (μ) RA: −1.92 mas /yr Dec.: −5.89 mas /yr Parallax (π)3.56 ± 0.19 mas Distance 920 ± 50 ly (280 ± 10 pc ) Absolute magnitude (MV )−2.87
Details Mass 9.7±0.2 M ☉ Luminosity 3,631.92 L ☉ Surface gravity (log g )3.54 cgs Temperature 22,420±1,440 K Rotational velocity (v sin i )41 km/s Age 20.0±1.4 Myr
Other designations 102 Her , BD +20°3674, FK5 3443, HD 166182, HIP 88886, HR 6787, SAO 85769, WDS J18088+2049
Database references SIMBAD data
102 Herculis is a single star in the northern constellation of Hercules . It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.37. Based upon parallax measurements , it is located around 920 light years away from the Sun. The star is moving closer to the Earth with a heliocentric radial velocity of −15 km/s.
The stellar classification of this object matches a massive, early B-type star with a luminosity class of IV or V, corresponding to a subgiant or main sequence star, respectively. It is 20 million years old with nearly ten times the mass of the Sun and is spinning with a projected rotational velocity of 41 km/s. The strength of the stellar magnetic field has been measured at (209.5±135.4)×10 T . The star is radiating 3,632 times the Sun's luminosity from its photosphere at an effective temperature of 22,420 K.
Etymology
In Chinese , 帛度 (Bó Dù ), meaning Textile Ruler , refers to an asterism consisting of 102 Herculis and 95 Her .Consequently, 102 Herculis itself is known as 帛度二 (Bó Dù èr , English: the Second Star of Textile Ruler.)
This star, together with 93 Her , 95 Her , and 109 Her , formed the now obsolete constellation of Cerberus .
References
^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 .
^ 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 , S2CID 119257644 .
^ Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement , 17 : 371, Bibcode :1968ApJS...17..371L , doi :10.1086/190179 .
^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society , 410 (1): 190–200, arXiv :1007.4883 , Bibcode :2011MNRAS.410..190T , doi :10.1111/j.1365-2966.2010.17434.x , S2CID 118629873 .
^ Eggen, Olin J. (1961), "Space motions and distribution of the apparently bright B-type stars", Royal Observatory Bulletins , 41 : 245–287, Bibcode :1961RGOB...41..245E .
^ Bychkov, V. D.; et al. (August 2003), "Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars", Astronomy and Astrophysics , 407 (2): 631–642, arXiv :astro-ph/0307356 , Bibcode :2003A&A...407..631B , doi :10.1051/0004-6361:20030741 , S2CID 14184105 .
Lyubimkov, L. S.; et al. (June 2004), "Surface abundances of light elements for a large sample of early B-type stars - III. An analysis of helium lines in spectra of 102 stars", Monthly Notices of the Royal Astronomical Society , 351 (2): 745–767, Bibcode :2004MNRAS.351..745L , doi :10.1111/j.1365-2966.2004.07825.x .
^ Zorec, J.; et al. (July 2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff ", Astronomy and Astrophysics , 501 (1): 297–320, arXiv :0903.5134 , Bibcode :2009A&A...501..297Z , doi :10.1051/0004-6361/200811147 , S2CID 14969137 .
^ Simón-Díaz, S.; et al. (2017), "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars", Astronomy and Astrophysics , 597 : A22, arXiv :1608.05508 , Bibcode :2017A&A...597A..22S , doi :10.1051/0004-6361/201628541 , S2CID 3478126 .
"102 Her" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-17.
Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
Ian Ridpath's Startales - Hercules
Ian Ridpath's Star Tales - Cerberus
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102 Herculis
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