20210-1447 BAR  12Ba,Bb

Coord 2000	20210-1447		Discov num	BAR  12		Comp	Ba,Bb		Coord arcsec 2000	20 20 46.55 -14 47 05.5
Date first	1884		Date last	2019		Obs	26
Pa first	106		Pa last	54		P.A. Now (θ)	54.3°
Sep first	0.9		Sep last	0.5		Sep. Now (ρ)	0.47"
Mag pri	6.16		Mag sec	9.14		delta mag (ΔM)	2.98		Spectral class	A0III (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	54.4		Precise sep	0.451		Constellation	Capricornus		SAO	163471
HIP	100325		Tycho2	5753-02282-1		Gaia DR2	91389558400		HD	193452
HR	7775		GC	28286		ADS	13717		BD	BD-15 5626
Bayer	Beta 2 Capricorni		Bayer name	Bet2 Cap		Distance	104.06		Distance ly	339.44
last precise pa	54.4		last precise sep	0.451

Period (P)	538.62y		Periastron (T)	2073.19y		Semi-major axis (a)	0.943a
Eccentricity (e)	0.07		Inclination (i)	112.6°		Longitude of periastron (ω)	107.7°
Node (Ω)	96.6°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.616 70.1 2001 0.608 69.5 2002 0.601 68.9 2003 0.593 68.2 2004 0.586 67.6 2005 0.578 66.9 2006 0.571 66.2 2007 0.564 65.5 2008 0.556 64.8 2009 0.549 64.0 2010 0.541 63.3 2011 0.534 62.5 2012 0.526 61.7 2013 0.519 60.8 2014 0.512 60.0 2015 0.504 59.1 2016 0.497 58.2 2017 0.490 57.2 2018 0.483 56.3 2019 0.475 55.3 2020 0.468 54.3 2021 0.461 53.2 2022 0.455 52.1 2023 0.448 51.0 2024 0.441 49.8 2025 0.435 48.7 2026 0.428 47.4 2027 0.422 46.2 2028 0.416 44.9 2029 0.410 43.5 2030 0.404 42.2 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	BAR 12	Ba,Bb	1991	18	75	0.7	6.16	9.14	A0III	N	202046.52-144705.6
20210-1447	BAR 12	Ba,Bb	2008	19	64	0.5	6.16	9.14	A0III	N	202046.52-144705.6
20210-1447	BAR 12	Ba,Bb	2015	20	59	0.5	6.16	9.14	A0III	NO	202046.55-144705.5
20210-1447	BAR 12	Ba,Bb	2017	23	57	0.5	6.16	9.14	A0III	NO	202046.55-144705.5
20210-1447	BAR 12	Ba,Bb	2018	24	56	0.5	6.16	9.14	A0III	NO	202046.55-144705.5
20210-1447	BAR 12	Ba,Bb	2019	26	54	0.5	6.16	9.14	A0III	NO	202046.55-144705.5

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