Alpha Doradus

Starbox 2
name = α Doradus
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Dorado
component_a = A
component_b = B
ra_a_h = 04
ra_a_m = 33
ra_a_s = 59.778
dec_a_d = −55
dec_a_m = 02
dec_a_s = 41.91
radec_a_footnote = [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=4251 HIP 21281, record for component 1] , Hipparcos catalogue; CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239] .]
ra_b_h = 04
ra_b_m = 33
ra_b_s = 59.782
dec_b_d = −55
dec_b_m = 02
dec_b_s = 42.39
radec_b_footnote = [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=4252 HIP 21281, record for component 2] , Hipparcos catalogue; CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239] .]
appmag_v_a=3.8
appmag_v_b=4.3
class_a = A0IIIp
class_b = B9IV
u-b_system = −0.35 [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=1465 HR 1465] , 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 3, 2008.]
b-v_system = −0.10
r-i_system = −0.09
variable_a = ACV
radial_v_a = 25.6 ± 0.9
prop_mo_ra_a = 58.06
prop_mo_dec_a = 12.73
prop_mo_ra_b = 42.83
prop_mo_dec_b = 12.94
parallax = 18.56
p_error = 0.46
parallax_footnote = SIMBAD link|alp+dor|V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.]
absmag_v=–0.38 (combined) [From apparent magnitude and parallax.]
mass_a=3.0 [http://www.astro.uiuc.edu/~kaler/sow/alphador.html Alpha Dor] , Jim Kaler, "Stars". Accessed on line September 3, 2008.]
mass_b=2.7
luminosity_bolometric_a=160
luminosity_bolometric_b=70
radius_a=2.8
radius_b=1.9
temperature_a=12200
temperature_b=12200
orbit_footnote=Entry 04340-5503, [http://ad.usno.navy.mil/wds/orb6/orb6orbits.txt Sixth Catalog of Orbits of Visual Binary Stars] ,
United States Naval Observatory. Accessed on line September 3, 2008.]
period_unitless=12.1 y
axis_unitless=0.18″
periastron=B1986
inclination=31
node=140
eccentricity=0.80
periarg=193
names=α Dor, Alpha Doradus, Alpha Dor, B 2092, CCDM J04340-5503AB, CD−55 916, CPD−55 663, FK5 171, GC 5600, HD 29305, HIP 21281, HR 1465, IDS 04318-5515 AB, PPM 333592, SAO 233564, WDS 04340-5503AB.
simbad_system=alp+dor

Alpha Doradus (Alpha Dor / α Doradus / α Dor) is the brightest star in the constellation of Dorado. It is actually a binary system of two stars, and has an overall apparent visual magnitude which varies between 3.26 and 3.30.alf Dor, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.] The binary star consists of a subgiant with spectral type B revolving around a giant star with spectral type A in an eccentric orbit with a period of about 12 years. The orbital separation varies from 2 astronomical units at periastron to 17.5 astronomical units at apastron. The primary, α Doradus A, is a chemically peculiar star whose atmosphere has a high concentration of silicon.

Visual companion

Starbox begin
name = CCDM J04340-5503CStarbox observe
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Dorado
ra = RA|04|34|08.7251SIMBAD link|CD-55+917|CD-55 917 -- Star in double system, database entry, SIMBAD. Accessed on line September 3, 2008.]
dec = DEC|−55|02|47.754
appmag_v=10.1Starbox character
b-v = 1.2Starbox astrometry
prop_mo_ra = 63.50
prop_mo_dec = 144.30Starbox relpos
primary=α Doradus AB
epoch=1999
posang=94
posangref=
angdistsec=77.2
angdistref=Starbox catalog
names=HJ 3668C, CD−55 917, CPD−55 664, IDS 04318-5515 C, PPM 333595, SAO 233565, WDS 04340-5503C.Starbox reference
Simbad=CD-55+917

The binary star has an optical visual companion, CCDM J04340-5503C, located 77 arcseconds away. It has no physical relation to the other two stars.Entry 04340-5503, discoverer code HJ3668, components AB-C, [http://ad.usno.navy.mil/wds/wdsnewframe1.html The Washington Double Star Catalog] , United States Naval Observatory. Accessed on line September 3, 2008.]

References