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)	183.9°
Sep first	0.3		Sep last	0.4		Sep. Now (ρ)	0.41"
Mag pri	9.25		Mag sec	6.61		delta mag (ΔM)	2.64		Spectral class	A2V+G5IV (white/yellow)
Pri motion ra	-001		Sec motion ra
Pri motion dec	-058		Sec motion dec
Notes	N O (See Notes, Orbital solution)

Visually invisible, K-band or other infrared star 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)	343.2y		Periastron (T)	1998.85y		Semi-major axis (a)	0.678a
Eccentricity (e)	0.716		Inclination (i)	126.5°		Longitude of periastron (ω)	73.5°
Node (Ω)	3.3°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2018

label rho theta 2000 0.117 283.5 2001 0.117 268.7 2002 0.124 254.9 2003 0.136 243.0 2004 0.151 233.2 2005 0.168 225.3 2006 0.186 218.9 2007 0.204 213.6 2008 0.223 209.2 2009 0.241 205.5 2010 0.259 202.3 2011 0.277 199.5 2012 0.293 197.0 2013 0.310 194.8 2014 0.325 192.8 2015 0.341 191.0 2016 0.355 189.4 2017 0.369 187.8 2018 0.383 186.4 2019 0.396 185.1 2020 0.409 183.9 2021 0.421 182.7 2022 0.433 181.6 2023 0.444 180.6 2024 0.455 179.6 2025 0.466 178.6 2026 0.476 177.7 2027 0.486 176.9 2028 0.496 176.0 2029 0.505 175.2 2030 0.514 174.5 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
19531-1436	CHR 90		2018	26	186	0.4	9.25	6.61	A0V+F8IV	NO	195306.39-143611.1

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