Beta ¹ Capricorni

Database links to β ¹ Capricorni

Double star β 1 Capricorni
β 1 cap in the constellation "Capricorn"
AladinLite
Observation dates equinox :  J2000.0 , epoch : J2000.0
Constellation	Capricorn
Right ascension	20 h 21 m 0.67 s
declination	-14 ° 46 ′ 53 ″
Apparent brightness	3.21 mag
Typing
B − V color index	0.79
U − B color index	0.27
R − I index	0.50
Spectral class	K0: II: + A5: n
Astrometry
Radial velocity	(−19.0 ± 0.6) km / s
parallax	(9.98 ± 1.09)  mas
distance	(327 ± 36)  ly (100 ± 11)  pc
Proper movement
Rec. Share:	(44.92 ± 1.31)  mas / a
Dec. portion:	(7.38 ± 1.29)  mas / a
Physical Properties
Other names and catalog entries
Bayer name β 1 capricorni Flamsteed name 9 capricorni Bonn survey BD −15 ° 5629 Bright Star Catalog HR 7776 [1] Henry Draper Catalog HD 193495, 193496 Hipparcos catalog HIP 100345 [2] SAO catalog SAO 163481 [3] Tycho catalog TYC 5753-2281-1 [4] 2MASS catalog 2MASS 20210066-1446531 [5] Other names WDS 20210-1447 CCDM 20210-1447 FK5 762

Beta ¹ Capricorni (β ¹ Cap) is the lighter component of the visual binary star Beta Capricorni in the constellation Capricorn . It has an apparent magnitude of 3.2 mag and its distance is approximately 330 light years .

Beta ¹ Capricorni is a multiple system of four single stars. The main star is an orange-colored bright giant with almost four times the mass, 31 times the diameter and 500 times the luminosity of the sun . It and a somewhat heavier white main sequence star of over four times the mass, 1.3 times the diameter and 20 times the luminosity of the sun orbit each other in 3.8 years. The white star is also a close spectroscopic binary star itself. The third component orbits it in just 8.7 days, otherwise no further details are known about it. Yet another star, about five times the luminosity of the Sun, about which little is known, stands a short distance from the orange giant.

Beta ¹ is together with the star Beta ² Capricorni also with the proper name " Dabih " (from Arabic سعد الذابح, DMG saʿd aḏ-ḏābiḥ  'luck (star) of the slaughterer'). To distinguish it from this, it is also called " Dabih Major ". According to the “IAU Catalog of Star Names” of the Working Group on Star Names (WGSN) of the IAU for the standardization of star names, the name in the form “Dabih” was only assigned to the lighter Beta ¹ Capricorni in 2016 .

Individual evidence

1. ↑ ^{a b c d e} VizieR: Hipparcos, the New Reduction (van Leeuwen, 2007) - The Astrometric Catalog
2. ↑ ^{a b c} VizieR: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)
3. ↑ VizieR: General Catalog of Stellar Radial Velocities (Wilson, 1953)
4. ↑ VizieR: Multiple star catalog (MSC) (Tokovinin 1997–1999)
5. ^ VizieR: Catalog of Stellar Diameters (CADARS) (Pasinetti-Fracassini + 2001)
6. ^ PP Eggleton, AA Tokovinin: A catalog of multiplicity among bright stellar systems. In: Monthly Notes of the Royal Astronomical Society. Vol. 389, 2008, doi: 10.1111 / j.1365-2966.2008.13596.x , pp. 869-879 ( bibcode : 2008MNRAS.389..869E ).
7. ↑ Bulletin of the IAU Working Group on Star Names, No. 2. IAU Division C Education, Outreach and Heritage, 2016, iau.org (PDF; 158 kB).