Beta Herculis

Beta Herculis

Starbox begin
name = β Herculis
Starbox 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 = +0.47
Starbox 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=24.6
Starbox 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 SB9 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+2129B
Starbox 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=10.7
Starbox character
b-v = 0.4
v-r = −2.1
Starbox astrometry
prop_mo_ra = −1.60
prop_mo_dec = 11.60
Starbox 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


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