Beta Herculis

Starbox begin
name = β HerculisStarbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Hercules
ra = RA|16|30|13.1999SIMBAD link|bet+her|SV* ZI 1252 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line September 18, 2008.]
dec = DEC|+21|29|22.608
appmag_v=2.76 to 2.81NSV 7778, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/nsv/nsv.dat New Catalogue of Suspected Variable Stars, the improved version] , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 18, 2008.] Starbox character
class = G7III / ?
(binary)
u-b = +0.69 [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=6148 HR 6148] , database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50] . Accessed on line September 18, 2008.]
b-v = +0.94
r-i = +0.47Starbox astrometry
radial_v = −25.5 ± 0.9
prop_mo_ra = −98.43
prop_mo_dec = −14.49
parallax = 22.07
p_error = 1.00
parallax_footnote =
absmag_v= −0.5 [From apparent magnitude and parallax.] Starbox detail
luminosity=Primary:
175
radius=Primary:
20
temperature=Primary:
4900
mass=Primary / secondary:
2.9 / 0.9 [The Visual Orbit, the Stellar Diameter and the Magnitude Difference of the Spectroscopic Binary β Herculis, X. P. Pan, M. Shao, M. M. Colavita, B. E. Hines, J. T. Armstrong, C. S. Denisson, M. Vivekanand, D. Mozurkewich, R. S. Simon, K. J. Johnston, "Bulletin of the American Astronomical Society" 22 (September 1990), p. 1335, bibcode|1990BAAS...22R1335P.] Starbox orbit
reference=^{, Table 3.}
period_unitless=410.6 d
axis_unitless=11.37 ± 0.51 mas
periastron=15500.4 MJD
inclination=53.8 ± 2.3
node=341.9 ± 3.8
eccentricity=0.55
periarg_primary=24.6Starbox catalog
names=Kornephoros, Korneforos, Rutilicus, β Her, Beta Herculis, Beta Her, 27 Herculis, 27 Her, BD+21 2934, CCDM J16302+2129A, FK5 618, GC 22193, HD 148856, HIP 80816, HR 6148, IDS 16260+2142 A, PPM 104935, SAO 84411, WDS 16302+2129A/Aa.Starbox reference
Simbad=bet+her

Beta Herculis (Beta Her / β Herculis / β Her), which also has the name Kornephoros, is the brightest star in the constellation of Hercules. [http://www.astro.uiuc.edu/~kaler/sow/kornephoros.html Kornephoros] , "Stars", Jim Kaler. Accessed on line September 18, 2008.] It has an apparent visual magnitude which varies between 2.76 and 2.81.

Although β Herculis appears to the naked eye to be a single star, W. W. Campbell discovered in July 1899 from spectroscopic measurements that its radial velocity towards the Sun varies, and concluded that it is a binary system of two stars. [The variable velocity of β Herculis in the line of sight, W. W. Campbell, "Astrophysical Journal" 11 (1900), p. 140, bibcode|1900ApJ....11..140C, doi|10.1086/140674.] An orbit for the binary was computed in 1908 from additional spectroscopic measurements. [The orbit of β Herculis, H. C. Plummer, "Lick Observatory Bulletin" 5 (1908), pp. 24–26, bibcode|1908LicOB...5...24P.]

At Palomar Observatory, Antoine Labeyrie and others used speckle interferometry with the Hale Telescope to resolve the system in 1977. [The digital speckle interferometer: preliminary results on 59 stars and 3C 27, A. Blazit, D. Bonneau, L. Koechlin, and A. Labeyrie, "Astrophysical Journal Letters" 214 (June 1, 1977), pp. L79–L84, bibcode|1977ApJ...214L..79B.] The Hipparcos satellite observed the orbital motion of the primary relative to other stars, [ [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HIP%2080816 HIP 80816] , database entry, The Hipparcos and Tycho Catalogues, ESA, 1997, CDS ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239] .] and an orbit was computed in 2005 using spectroscopic data together with these measurements. The period of the system is around 410 days.Astrometric orbits of S_B⁹ stars, S. Jancart, A. Jorissen, C. Babusiaux, and D. Pourbaix, "Astronomy and Astrophysics" 442, #1 (October 2005), pp. 365–380, doi|10.1051/0004-6361:20053003, bibcode|2005A&A...442..365J.]

The primary of the binary system is a G-type giant star.

Naming and etymology

β Herculis has the names "Kornephoros", a Greek word meaning "club bearer", and "Rutilicus", a corruption of the Latin word "titillicus", meaning "armpit".

Visual companion

Starbox begin
name = CCDM J16302+2129BStarbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Hercules
ra = RA|16|29|55.5830SIMBAD link|CCDM+J16302%2B2129B|BD+21 2934B -- Star in double system, database entry, SIMBAD. Accessed on line September 18, 2008.]
dec = DEC|+21|29|42.516
appmag_v=10.7Starbox character
b-v = 0.4
v-r = −2.1Starbox astrometry
prop_mo_ra = −1.60
prop_mo_dec = 11.60Starbox relpos
epoch = 1991
primary = A
angdistsec = 247.5
angdistref = Entry 16302+2129, [http://ad.usno.navy.mil/wds/wdsnewframe3.html The Washington Double Star Catalog] , United States Naval Observatory. Accessed on line September 18, 2008.]
posang = 275
posangref= Starbox catalog
names=BD+21 2934B, IDS 16260+2142 B, WDS 16302+2129B.Starbox reference
Simbad=CCDM+J16302%2B2129B

β Herculis has a visual companion, CCDM J16302+2129B, which has an apparent visual magnitude of approximately 10.7. It is probably optical and not physically bound to β Herculis.

References