Beta Capricorni

β¹/β² Capricorni

Beta Capricorni circled on a chart of Capricorn; the map is to be held up as with most sky maps so that the right of page is west.
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Capricornus
Right ascension	20h 21m 0.7s [citation needed]
Declination	14° 46′ 53″ [citation needed]
Apparent magnitude (V)	+3.05/+6.09 [citation needed]
Characteristics
Spectral type	K0II+B8V/A0III
U−B color index	0.28/−0.11
B−V color index	0.79/−0.02
Variable type	none
Astrometry
Radial velocity (Rv)	−19/−18 km/s
Proper motion (μ)	RA: 48.42/42.64 mas/yr Dec.: 14.00/0.37 mas/yr
Parallax (π)	8.3966 ± 0.6348 mas[1]
Distance	390 ± 30 ly (119 ± 9 pc)
Absolute magnitude (MV)	−2.03/+1.03[2]
Other designations
Dabih, Dabikh, Dikhabda, 9 Capricorni, FK5 762, WDS J20210-1447AB
β1 Cap: BD−15° 5629, HD 193495, HIP 100345, HR 7776, WDS J20210-1447A
β2 Cap: BD−15° 5626, HD 193452, HIP 100325, HR 7775, WDS J20210-1447B
Database references
SIMBAD	β Cap
	β1 Cap
	β2 Cap

Beta Capricorni (β Capricorni, abbreviated Beta Cap, β Cap) is a multiple star system in the constellation of Capricornus and located 328 light-years from the Sun. Because it is near the ecliptic, Beta Capricorni can be occulted by the Moon,^[3] and also (rarely) by planets.

The system is believed to consist of five stars.^[4] With binoculars or a small telescope, Beta Capricorni can be resolved into a binary pair. The brighter of the two is designated Beta¹ Capricorni or Beta Capricorni A; the dimmer, Beta² Capricorni or Beta Capricorni B. Both are themselves made up of multiple stars. Beta¹ Capricorni has three components; a single star designated Beta Capricorni Aa (formally named Dabih /ˈdeɪbiː/, the traditional name of the system)^[5][6] and a binary pair, Beta Capricorni Ab (whose two components are designated Beta Capricorni Ab1 and Ab2). Beta² Capricorni is also a binary pair, with components designated Beta Capricorni Ba and Bb.

Two other nearby stars were discovered by John Herschel. Sometimes referred to as Beta Capricorni D and E, it is unclear whether they are simply optical doubles or part of the Beta Capricorni system.^{[citation needed]}