19471-0809 A   108

Coord 2000	19471-0809		Discov num	A   108		Comp			Coord arcsec 2000	19 47 08.04 -08 09 09.9
Date first	1900		Date last	2018		Obs	42
Pa first	183		Pa last	107		P.A. Now (θ)	109.4°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.32"
Mag pri	8.74		Mag sec	9.24		delta mag (ΔM)	0.5		Spectral class	K0 (yellow-orange)
Pri motion ra	+003		Sec motion ra
Pri motion dec	-024		Sec motion dec
Notes	O (Orbital solution)

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

Precise pa	107.3		Precise sep	0.315		Constellation	Aquila		HIP	97350
Tycho2	5724-01075-1		Gaia DR2	44448739456		HD	186847		ADS	12911
BD	BD-08 5103		Distance	171.82		Distance ly	560.48		last precise pa	107.3
last precise sep	0.315

Period (P)	242.85y		Periastron (T)	1946.34y		Semi-major axis (a)	0.299a
Eccentricity (e)	0.717		Inclination (i)	51.4°		Longitude of periastron (ω)	265°
Node (Ω)	53.8°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.298 97.3 2001 0.300 98.0 2002 0.301 98.6 2003 0.302 99.3 2004 0.303 99.9 2005 0.305 100.5 2006 0.306 101.1 2007 0.307 101.7 2008 0.308 102.4 2009 0.309 103.0 2010 0.310 103.6 2011 0.310 104.2 2012 0.311 104.8 2013 0.312 105.4 2014 0.313 105.9 2015 0.314 106.5 2016 0.314 107.1 2017 0.315 107.7 2018 0.316 108.3 2019 0.316 108.9 2020 0.317 109.4 2021 0.318 110.0 2022 0.318 110.6 2023 0.319 111.1 2024 0.319 111.7 2025 0.320 112.3 2026 0.320 112.8 2027 0.321 113.4 2028 0.321 114.0 2029 0.321 114.5 2030 0.322 115.1 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
19471-0809	A 108		1996	38	98	0.3	8.74	9.24	K0	NO	194708.04-080909.9
19471-0809	A 108		2008	40	101	0.3	8.74	9.24	K0	NO	194708.04-080909.9
19471-0809	A 108		2009	41	100	0.3	8.74	9.24	K0	NO	194708.04-080909.9
19471-0809	A 108		2018	42	107	0.3	8.74	9.24	K0	O	194708.04-080909.9

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