Beta Hydrae

Starbox 2
name = β Hydrae
epoch = J2000.0
equinox = J2000.0 (ICRS)
constell = Hydra
component_a = A
component_b = B
ra_a_h = 11
ra_a_m = 52
ra_a_s = 54.521
dec_a_d = −33
dec_a_m = 54
dec_a_s = 29.25
radec_a_footnote = [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=11965 HIP 57936, record for component 1] , Hipparcos catalogue; CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239] .]
ra_b_h = 11
ra_b_m = 52
ra_b_s = 54.550
dec_b_d = −33
dec_b_m = 54
dec_b_s = 28.73
radec_b_footnote = [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=11966 HIP 57936, record for component 2] , Hipparcos catalogue; CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?I/239 I/239] .]
appmag_v_system=4.276(combined)SIMBAD link|alp+dor|V* alf Dor -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.]
appmag_v_a=4.67Entry 11529-3354, [http://ad.usno.navy.mil/wds/wdsnewframe2.html The Washington Double Star Catalog] , United States Naval Observatory. Accessed on line September 23, 2008.]
appmag_v_b=5.47
class_a=B9IIIsp...
u-b_system = −0.33 [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=4552 HR 4552] , 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 23, 2008.]
b-v_system = −0.10
r-i_system = −0.08
variable_a = ACVNotes, Entry 11529-3354, [http://ad.usno.navy.mil/wds/wdsnewnotes_main.txt The Washington Double Star Catalog] , United States Naval Observatory. Accessed on line September 23, 2008.]
prop_mo_ra_a = −58.02
prop_mo_dec_a = 2.40
prop_mo_ra_b = −52.70
prop_mo_dec_b = −8.94
parallax = 8.93
p_error = 0.88
parallax_footnote =
radial_v_a = −1 ± 5
absmag_v_system= −1.0 [From apparent magnitude and parallax.]
luminosity_bolometric_a=210 [http://www.astro.uiuc.edu/~kaler/sow/betahya.html Beta Hydrae] , "Stars", Jim Kaler. Accessed on line September 23, 2008.]
radius_a=4.0
mass_a=3.3
mass_b=~3
age_a=2.2 × 10⁸
temperature_a=11,100
names=β Hya, Beta Hydrae, Beta Hya, HJ 4478AB, CCDM J11529-3354AB, CD−33 8018, CPD−33 3159, GC 16258, HD 103192, HIP 57936, HR 4552, IDS 11479-3321 AB, PPM 289465, SAO 202901, WDS 11529-3354AB.
simbad_system=bet+hya

Beta Hydrae (Beta Hya / β Hydrae / β Hya) is a double star in the constellation of Hydra. Its overall apparent visual magnitude varies by 0.04 magnitudes with a period of 2.344 days, and is approximately 4.27 at maximum brightness.bet Hya, 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 23, 2008.] The brighter star in the double is a giant Bp star which has been classified as an α² Canum Venaticorum variable.

References