Beta Draconis

Starbox begin
name = β DraconisStarbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Draco
ra = RA|17|30|25.9620SIMBAD link|bet+dra|* bet Dra -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008.]
dec = DEC|+52|18|04.994
appmag_v=2.79Starbox character
class = G2Iab:
u-b = +0.64 [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=6536 HR 6536] , 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 17, 2008.]
b-v = +0.98
r-i = +0.48Starbox astrometry
radial_v = −20.0 ± 0.9
prop_mo_ra = −15.59
prop_mo_dec = 11.57
parallax = 9.02
p_error = 0.49
parallax_footnote =
absmag_v= −2.4 [From apparent magnitude and parallax.] Starbox detail
rotational_velocity = 13
radius = 40
luminosity = 950
temperature = 5100
mass = 5Starbox catalog
names=Rastaban, Rastaben, Alwaid, Asuia, β Dra, Beta Draconis, Beta Dra, 23 Draconis, 23 Dra, ADS 10611 A, BD+52 2065, CCDM J17305+5218A, FK5 653, GC 23741, HD 159181, HIP 85670, HR 6536, IDS 17282+5223 A, PPM 36022, SAO 30429, WDS 17304+5218A.Starbox reference
Simbad=bet+dra

Beta Draconis (Beta Dra / β Draconis / β Dra) is the third brightest star in the constellation of Draco. It has the traditional name Rastaban, which confusingly has also been used for Gamma Draconis.pp. 207–208, [http://books.google.com/books?id=5xQuAAAAIAAJ "Star-names and Their Meanings"] , Richard Hinckley Allen, New York, London: G. E. Stechert, 1899.] [http://www.astro.uiuc.edu/~kaler/sow/rastaban.html Rastaban] , "Stars", Jim Kaler. Accessed on line September 17, 2008.]

It is a G-type supergiant star, with spectral class G2 and an apparent visual magnitude of approximately 2.79. Its distance from the Sun is around 360 light years. It is a binary star, with a binary star designation of ADS 10611, in which the supergiant is orbited by a dwarf companion once every four millennia or so.

The traditional name, from the Arabic phrase "ra's ath-thu'ban" ("head of the serpent") is less commonly written Rastaben, and has also been used for the star Gamma Draconis. Rastaban is also known as Asuia and Alwaid, the latter meaning "who is to be destroyed," though some trace it to Arabic "al'awwad" ("the lute player"). It is part of the asterism of the Mother Camels (Arabic "al'awa'id"), which may have influenced this alternate name. [ [http://www.constellationsofwords.com/stars/Alwaid.html Alwaid] , "Constellations of Words", Anne Wright. Accessed on line September 17, 2008.]

Components

The star has two visual companions, one, B, being the dwarf companion mentioned above.

Componentbox begin
designation=WDS 17304+5218
footnote=Entry 17304+5218, [http://ad.usno.navy.mil/wds/wdsnewframe3.html The Washington Double Star Catalog] ,
United States Naval Observatory. Accessed on line September 17, 2008.]
expanded = yesComponentbox component
letter = B
primary = A
appmag_v = 14.0
epoch = 1934
posang= 12
angdist= 4.4
ra = RA|17|30|26.0
dec = DEC|+52|18|09
radec_footnote = SIMBAD link|CCDM+J17305%2B5218B|BD+52 2065B -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008.]
simbad = CCDM+J17305%2B5218B
expanded = yesComponentbox component
letter = C
primary = A
appmag_v = 12.7
epoch = 1998
posang= 156
angdist= 117.9
ra = RA|17|30|26.7
dec = DEC|+52|17|49
radec_footnote = SIMBAD link|CCDM+J17305%2B5218C|BD+52 2065C -- Star in double system, database entry, SIMBAD. Accessed on line September 17, 2008.]
simbad = CCDM+J17305%2B5218C
expanded = yes

References

External links

*Dibon-Smith, Richard (1992). "StarList 2000: A Quick Reference Star Catalog for Astronomers". New York: John Wiley & Sons. ISBN 0-471-55895-8