18520-5418 TOK 325Aa,Ab

Coord 2000	18520-5418		Discov num	TOK 325		Comp	Aa,Ab		Coord arcsec 2000	18 52 01.95 -54 18 07.0
Date first	2012		Date last	2020		Obs	16
Pa first	271		Pa last	215		P.A. Now (θ)	191.9°
Sep first	0.1		Sep last	0.1		Sep. Now (ρ)	0.08"
Mag pri	8.61		Mag sec	11.50		delta mag (ΔM)	2.89		Spectral class	G3V (yellow)
Pri motion ra	+060		Sec motion ra
Pri motion dec	-042		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		245762	18 52 02 -54 18 07	TOK 325 Aa,Ab	2020	16	192	0.1	8.61	11.50	2.89	Y	<===
Show		245762	18 52 02 -54 18 07	TOK 325 AB	2015	8	32	146.0	8.61	11.42	2.81

Triple system
2 visible stars in this system

Precise pa	214.5		Precise sep	0.077		Constellation	Telescopium		SAO	245762
HIP	92592		Tycho2	8758-02778-1		Gaia DR2	6650457382678224640		HD	174122
CP	CP-54 9114		Distance	51.28		Distance ly	167.28		last precise pa	214.5
last precise sep	0.077

Period (P)	13.2y	± 1.8	Periastron (T)	2017.12y	± 0.21	Semi-major axis (a)	0.106a	± 0.004
Eccentricity (e)	0.314	± 0.064	Inclination (i)	47.3°	± 5.6	Longitude of periastron (ω)	308.3°	± 13
Node (Ω)	110.7°	± 4.7	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2018

label rho theta 2000 0.123 285.1 2001 0.109 299.6 2002 0.083 321.2 2003 0.054 6.8 2004 0.061 74.4 2005 0.081 113.0 2006 0.085 141.0 2007 0.083 169.0 2008 0.085 197.4 2009 0.095 222.2 2010 0.107 241.7 2011 0.119 257.0 2012 0.126 270.1 2013 0.124 282.6 2014 0.113 296.4 2015 0.089 315.8 2016 0.059 354.3 2017 0.057 63.0 2018 0.078 106.8 2019 0.085 135.5 2020 0.083 163.3 2021 0.084 191.9 2022 0.092 217.6 2023 0.105 238.1 2024 0.117 254.2 2025 0.125 267.6 2026 0.125 280.0 2027 0.116 293.4 2028 0.094 311.1 2029 0.064 343.7 2030 0.053 50.0		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
18520-5418	TOK 325	Aa,Ab	2013	3	293	0.1	8.61	11.50			185201.95-541807.0
18520-5418	TOK 325	Aa,Ab	2014	5	311	0.1	8.61	11.50	G3V		185201.95-541807.0
18520-5418	TOK 325	Aa,Ab	2015	7	327	0.1	8.61	11.50	G3V		185201.95-541807.0
18520-5418	TOK 325	Aa,Ab	2017	9	81	0.1	8.61	11.50	G3V	N	185201.95-541807.0
18520-5418	TOK 325	Aa,Ab	2018	12	128	0.1	8.61	11.50	G3V	NO	185201.95-541807.0
18520-5418	TOK 325	Aa,Ab	2019	13	155	0.1	8.61	11.50	G3V	NO	185201.95-541807.0

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