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	2018		Obs	34
Pa first	290		Pa last	72		P.A. Now (θ)	252.1°
Sep first	1.0		Sep last	0.5		Sep. Now (ρ)	0.69"
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)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	72		Precise sep	0.524		Constellation	Sagittarius		SAO	188563
HIP	97348		Tycho2	6320-00835-1		Gaia DR2	23370895232		HD	186752
ADS	12909		BD	BD-20 5705		Distance	96.53		Distance ly	314.88
last precise pa	72		last precise sep	0.524

Period (P)	198.12y		Periastron (T)	2198.94y		Semi-major axis (a)	1.166a
Eccentricity (e)	0.852		Inclination (i)	65.3°		Longitude of periastron (ω)	271°
Node (Ω)	220.6°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2018

label rho theta 2000 0.121 73.6 2001 0.076 150.9 2002 0.158 199.4 2003 0.243 213.3 2004 0.312 220.3 2005 0.367 225.0 2006 0.412 228.6 2007 0.450 231.5 2008 0.483 234.0 2009 0.511 236.2 2010 0.537 238.1 2011 0.559 239.9 2012 0.580 241.6 2013 0.599 243.2 2014 0.616 244.6 2015 0.631 246.0 2016 0.646 247.3 2017 0.659 248.6 2018 0.671 249.8 2019 0.683 251.0 2020 0.694 252.1 2021 0.704 253.3 2022 0.713 254.3 2023 0.722 255.4 2024 0.731 256.4 2025 0.739 257.4 2026 0.746 258.4 2027 0.753 259.3 2028 0.760 260.3 2029 0.766 261.2 2030 0.772 262.1 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
19471-1953	BU 146		2018	34	72	0.5	8.61	9.52	G1/2V	O	194706.75-195250.4

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