20210-1447 BLA   7Aa,Ab

Coord 2000	20210-1447		Discov num	BLA   7		Comp	Aa,Ab		Coord arcsec 2000	20 21 00.67 -14 46 53.0
Date first	1976		Date last	2019		Obs	12
Pa first	49		Pa last	234		P.A. Now (θ)	213.5°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0.07"
Mag pri	3.10		Mag sec	4.90		delta mag (ΔM)	1.8		Spectral class	F8V+A0 (yellow-white/white)
Pri motion ra	+042		Sec motion ra
Pri motion dec	+002		Sec motion dec
Notes	N O (See Notes, Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		163481	20210-1447	BLA 7	Aa,Ab	1976	2019	12	214	0.1	3.10	4.90	1.80	Y	<===
Show	Dabih	163481	20210-1447	STFA 52	AB	1800	2012	41	267	205.4	3.15	6.08	2.93
Show		163481	20210-1447	STFA 52	AC	1905	2012	11	133	226.1	3.15	8.83	5.68
Show		163481	20210-1447	HJ 2948	AD	1891	2000	3	292	115.9	3.15	12.96	9.81
Show		163471	20210-1447	BAR 12	Ba,Bb	1884	2019	26	54	0.5	6.16	9.14	2.98	Y
Show		163471	20210-1447	STFA 52	BC	1895	2015	14	111	396.5	6.08	8.83	2.75
Show		163471	20210-1447	HJ 2948	DE	1823	2000	8	321	3.9	13.70	14.40	0.70

Septuple system
5 visible stars in this system

Precise pa	234.3		Precise sep	0.033		Constellation	Capricornus		SAO	163481
HIP	100345		Tycho2	5753-02281-1		Gaia DR2	75998568192		HD	193495
HR	7776		GC	28295		ADS	13717		BD	BD-15 5629
Bayer	Beta Capricorni		Bayer name	Bet Cap		Flamsteed	9 Capricorni		Flamsteed name	9 Cap
Distance	100.2		Distance ly	326.85		last precise pa	234.3		last precise sep	0.033

Period (P)	3.765y		Periastron (T)	2015.704y	± 0.035	Semi-major axis (a)	0.0665a	± 0.0023
Eccentricity (e)	0.043		Inclination (i)	80.9°	± 3.2	Longitude of periastron (ω)	120°
Node (Ω)	34.3°	± 2.1	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 0.039 46.6 2001 0.059 210.4 2002 0.022 242.1 2003 0.065 31.3 2004 0.017 70.1 2005 0.065 214.4 2006 0.012 329.9 2007 0.068 34.8 2008 0.016 177.4 2009 0.061 218.3 2010 0.031 15.6 2011 0.060 38.6 2012 0.039 202.2 2013 0.047 223.7 2014 0.050 25.5 2015 0.044 44.3 2016 0.056 209.2 2017 0.028 235.6 2018 0.063 30.4 2019 0.023 59.7 2020 0.065 213.5 2021 0.011 298.0 2022 0.068 33.9 2023 0.012 156.3 2024 0.063 217.2 2025 0.026 10.5 2026 0.063 37.5 2027 0.033 199.0 2028 0.051 222.0 2029 0.046 23.8 2030 0.049 42.5 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20210-1447	BLA 7	Aa,Ab	1992	7	48	0.0	3.10	4.90	F8V+A0	NOD	202100.65-144653.0
20210-1447	BLA 7	Aa,Ab	2014	8	42	0.0	3.10	4.90	F8V+A0	NO	202100.67-144653.0
20210-1447	BLA 7	Aa,Ab	2017	10	34	0.0	3.10	4.90	F8V+A0	NO	202100.67-144653.0
20210-1447	BLA 7	Aa,Ab	2018	11	40	0.1	3.10	4.90	F8V+A0	NO	202100.67-144653.0
20210-1447	BLA 7	Aa,Ab	2019	12	234	0.0	3.10	4.90	F8V+A0	NO	202100.67-144653.0

If you need more information about this double, apply for a data request form to the WDS.