19471-1953 BU  146

Coord 2000	19471-1953		Discov num	BU  146		Comp			Coord arcsec 2000	19 47 06.75 -19 52 50.4
Date first	1873		Date last	2010		Obs	33
Pa first	290		Pa last	58		P.A. Now (θ)	244.7°
Sep first	1.0		Sep last	0.5		Sep. Now (ρ)	0.79"
Mag pri	8.61		Mag sec	9.52		delta mag (ΔM)	0.91		Spectral class	G1/2V (yellow)
Pri motion ra	-044		Sec motion ra	-044
Pri motion dec	-033		Sec motion dec	-033
Notes	O (Orbital solution)

This double is physical.

Precise pa	57.8		Precise sep	0.539		Constellation	Sagittarius		SAO	188563
HIP	97348		Tycho2	6320-00835-1		HD	186752		ADS	12909
BD	BD-20 5705		Distance	96.53		Distance ly	314.88		last precise pa	57.8
last precise sep	0.539

Period (P)	260.15y		Periastron (T)	2262.78y		Semi-major axis (a)	1.565a
Eccentricity (e)	0.886		Inclination (i)	70.7°		Longitude of periastron (ω)	262.6°
Node (Ω)	228.4°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label rho theta 2000 0.313 47.5 2001 0.233 54.6 2002 0.125 71.9 2003 0.068 167.9 2004 0.180 212.7 2005 0.284 222.8 2006 0.366 227.7 2007 0.434 231.0 2008 0.491 233.4 2009 0.540 235.3 2010 0.583 237.0 2011 0.621 238.4 2012 0.656 239.7 2013 0.687 240.9 2014 0.716 241.9 2015 0.742 242.9 2016 0.766 243.8 2017 0.789 244.7 2018 0.810 245.5 2019 0.830 246.2 2020 0.848 247.0 2021 0.865 247.7 2022 0.882 248.4 2023 0.897 249.0 2024 0.911 249.7 2025 0.925 250.3 2026 0.938 250.9 2027 0.950 251.5 2028 0.962 252.0 2029 0.973 252.6 2030 0.983 253.1 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
19471-1953	BU 146		1991	29	28	0.6	8.61	9.52	G1/2V	OD	194706.75-195250.4
19471-1953	BU 146		2009	32	235	0.6	8.61	9.52	G1/2V	OD	194706.75-195250.4
19471-1953	BU 146		2010	33	58	0.5	8.61	9.52	G1/2V	OD	194706.75-195250.4

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