20289-1749 SHJ 323AB (Rho Cap)

Coord 2000	20289-1749		Discov num	SHJ 323		Comp	AB		Coord arcsec 2000	20 28 51.62 -17 48 49.2
Date first	1823		Date last	2018		Obs	77
Pa first	177		Pa last	190		P.A. Now (θ)	189.9°
Sep first	4.0		Sep last	1.7		Sep. Now (ρ)	1.74"
Mag pri	4.97		Mag sec	6.88		delta mag (ΔM)	1.91		Spectral class	F3V (yellow-white)
Pri motion ra	-003		Sec motion ra	-003
Pri motion dec	-017		Sec motion dec	-017
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	Rho Cap	163614	20289-1749	SHJ 323	AB	1823	2018	77	190	1.7	4.97	6.88	1.91	Y	<===
Show		163614	20289-1749	BU 61	AC	1871	2015	11	149	53.5	4.97	13.30	8.33
Show		163614	20289-1749	SHJ 323	AD	1800	2011	28	150	258.7	4.97	6.68	1.71
Show		163614	20289-1749	BU 61	BC	1898	2015	5	149	53.5	6.88	12.50	5.62
Show		163617	20289-1749	DOB 13	DE	1913	1999	5	96	54.3	6.67	10.60	3.93

Quintuple system
5 visible stars in this system

Precise pa	189.6		Precise sep	1.684		Name	Rho Cap		Constellation	Capricornus
SAO	163614		HIP	101027		Tycho2	6333-02128-1		Gaia DR2	74279114880
HD	194943		HR	7822		GC	28481		ADS	13887
GL	Gl 791.1A		BD	BD-18 5689		Bayer	Rho Capricorni		Bayer name	Rho Cap
Flamsteed	11 Capricorni		Flamsteed name	11 Cap		Distance	30.27		Distance ly	98.74
last precise pa	189.6		last precise sep	1.684

Period (P)	375.9934y	± 35.3768	Periastron (T)	1963.1816y	± 0.9798	Semi-major axis (a)	2.49532a	± 0.28841
Eccentricity (e)	0.96563	± 0.00996	Inclination (i)	112.355°	± 2.353	Longitude of periastron (ω)	125.842°	± 5.728
Node (Ω)	150.379°	± 2.937	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2013

label rho theta 2000 1.269 195.2 2001 1.295 194.9 2002 1.321 194.5 2003 1.346 194.2 2004 1.372 193.9 2005 1.397 193.6 2006 1.421 193.3 2007 1.446 193.0 2008 1.470 192.7 2009 1.494 192.4 2010 1.517 192.2 2011 1.541 191.9 2012 1.564 191.7 2013 1.587 191.4 2014 1.609 191.2 2015 1.632 191.0 2016 1.654 190.8 2017 1.676 190.6 2018 1.698 190.3 2019 1.719 190.1 2020 1.741 189.9 2021 1.762 189.8 2022 1.783 189.6 2023 1.804 189.4 2024 1.824 189.2 2025 1.845 189.0 2026 1.865 188.9 2027 1.885 188.7 2028 1.904 188.5 2029 1.924 188.4 2030 1.943 188.2 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
20289-1749	SHJ 323	AB	2004	65	194	1.3	4.97	6.88	F3V	NOD	202851.62-174849.2
20289-1749	SHJ 323	AB	2009	66	215	1.4	4.97	6.88	F3V	NOD	202851.62-174849.2
20289-1749	SHJ 323	AB	2013	71	191	1.6	4.97	6.88	F3V	NO	202851.62-174849.2
20289-1749	SHJ 323	AB	2016	71	194	1.5	4.97	6.88	F3V	NO	202851.62-174849.2
20289-1749	SHJ 323	AB	2018	74	190	1.7	4.97	6.88	F3V	NO	202851.62-174849.2

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