19531-1436 CHR  90 (V505 Sgr)

Coord 2000	19531-1436		Discov num	CHR  90		Comp			Coord arcsec 2000	19 53 06.39 -14 36 11.1
Date first	1985		Date last	2018		Obs	26
Pa first	190		Pa last	186		P.A. Now (θ)	0.3°
Sep first	0.3		Sep last	0.4		Sep. Now (ρ)	0.32"
Mag pri	9.25		Mag sec	6.61		delta mag (ΔM)	2.64		Spectral class	A0V+F8IV (white/yellow-white)
Pri motion ra	-001		Sec motion ra
Pri motion dec	-058		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	185.7		Precise sep	0.388		Var name	V505 Sgr		Constellation	Sagittarius
SAO	163080		HIP	97849		Tycho2	5737-00439-1		Gaia DR2	45986475904
HD	187949		HR	7571		BD	BD-14 5578		Distance	119.05
Distance ly	388.34		last precise pa	185.7		last precise sep	0.388

Period (P)	94.24y	± 0.72	Periastron (T)	2000.45y	± 0.7	Semi-major axis (a)	0.333a	± 0.004
Eccentricity (e)	0.308	± 0.007	Inclination (i)	120.4°	± 0.4	Longitude of periastron (ω)	272.3°	± 1.8
Node (Ω)	10.1°	± 0.5	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.117 102.3 2001 0.119 87.5 2002 0.127 73.8 2003 0.139 62.2 2004 0.155 52.7 2005 0.172 45.0 2006 0.189 38.8 2007 0.206 33.5 2008 0.223 29.1 2009 0.238 25.3 2010 0.252 21.9 2011 0.265 18.8 2012 0.276 16.0 2013 0.286 13.5 2014 0.295 11.0 2015 0.302 8.8 2016 0.307 6.6 2017 0.312 4.4 2018 0.315 2.4 2019 0.317 0.3 2020 0.318 358.3 2021 0.318 356.3 2022 0.318 354.3 2023 0.316 352.2 2024 0.314 350.2 2025 0.311 348.1 2026 0.307 346.0 2027 0.303 343.8 2028 0.298 341.5 2029 0.293 339.2 2030 0.288 336.8 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
19531-1436	CHR 90		2006	18	216	0.2	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2009	19	204	0.2	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2010	24	200	0.3	9.25	6.61	A0V+F8IV	NOD	195306.39-143611.1
19531-1436	CHR 90		2015	25	10	0.4	9.25	6.61	A0V+F8IV	NO	195306.39-143611.1

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