19190-3317 I 253 AB (HD 180702)

Coord 2000	19190-3317		Discov num	I   253		Comp	AB		Coord arcsec 2000	19 18 59.06 -33 16 41.8
Date first	1897		Date last	2021		Obs	46
Pa first	135		Pa last	141.2		P.A. Now (θ)	140.7°
Sep first	0.5		Sep last	0.571		Sep. Now (ρ)	0.596"
Mag pri	8.77		Mag sec	7.25		delta mag (ΔM)	1.52		Spectral class	G1V (yellow)
Pri motion ra	-016		Sec motion ra	-016
Pri motion dec	-131		Sec motion dec	-131
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	HD 180702	211161	19 18 59 -33 16 42	I 253 AB	2021	46	141	0.6	8.77	7.25	1.52	Y	<===
Show			19 18 59 -33 16 42	TOK 624 AC	1999	5	61	999.9	7.04	8.23	1.19

Triple system
3 estimated visually detectable stars in this system

Name	HD 180702		Constellation	Sagittarius		SAO	211161		HIP	94926
Tycho2	7427-01727-1		HD	180702		GC	26617		CD	CD-3314114
CP	CP-33 5579		Distance	55.1		Distance ly	179.74

Period (P)	56.59y	± 0.37	Periastron (T)	1939.36y	± 0.51	Semi-major axis (a)	448m	± 21
Eccentricity (e)	0.738	± 0.016	Inclination (i)	93.31°	± 0.22	Longitude of periastron (ω)	141.7°	± 4.3
Node (Ω)	137.96°	± 0.16	Notes			Reference	Mdz2021
Equinox			Last observation			Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 303.2 0.067 2001 279.5 0.032 2002 194.9 0.027 2003 162.4 0.060 2004 153.8 0.097 2005 150.0 0.134 2006 147.8 0.171 2007 146.4 0.206 2008 145.4 0.240 2009 144.6 0.273 2010 144.0 0.305 2011 143.5 0.335 2012 143.1 0.364 2013 142.8 0.391 2014 142.5 0.418 2015 142.2 0.443 2016 142.0 0.467 2017 141.7 0.489 2018 141.6 0.510 2019 141.4 0.530 2020 141.2 0.548 2021 141.0 0.566 2022 140.9 0.581 2023 140.7 0.596 2024 140.6 0.609 2025 140.5 0.620 2026 140.3 0.630 2027 140.2 0.639 2028 140.1 0.646 2029 140.0 0.652 2030 139.9 0.655		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic