19559+2500 COU1037

Coord 2000	19559+2500		Discov num	COU1037		Comp			Coord arcsec 2000	19 55 53.36 +25 00 09.4
Date first	1973		Date last	2008		Obs	7
Pa first	155		Pa last	161		P.A. Now (θ)	140.1°
Sep first	0.2		Sep last	0.1		Sep. Now (ρ)	0.1"
Mag pri	9.80		Mag sec	10.70		delta mag (ΔM)	0.9		Spectral class	G0+G5 (yellow/yellow)
Pri motion ra	+026		Sec motion ra
Pri motion dec	+019		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	160.9		Precise sep	0.101		Constellation	Vulpecula		SAO	87944
Tycho2	2144-00996-1		Gaia DR2	17414000384		HD	339227		last precise pa	160.9
last precise sep	0.101

Period (P)	39y	± 0.4	Periastron (T)	2001.45y	± 0.1	Semi-major axis (a)	0.157a	± 0.01
Eccentricity (e)	0.292	± 0.012	Inclination (i)	99°	± 3.5	Longitude of periastron (ω)	245.8°	± 8
Node (Ω)	155.7°	± 4	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2007

label rho theta 2000 0.087 328.1 2001 0.061 321.7 2002 0.033 304.6 2003 0.019 229.2 2004 0.042 180.3 2005 0.071 168.9 2006 0.097 164.0 2007 0.119 161.1 2008 0.138 159.0 2009 0.151 157.4 2010 0.161 156.0 2011 0.167 154.8 2012 0.170 153.6 2013 0.170 152.4 2014 0.166 151.2 2015 0.160 149.9 2016 0.152 148.5 2017 0.142 147.0 2018 0.131 145.1 2019 0.117 142.9 2020 0.103 140.1 2021 0.087 136.3 2022 0.071 130.8 2023 0.056 122.2 2024 0.041 107.2 2025 0.032 80.4 2026 0.032 45.3 2027 0.042 19.6 2028 0.057 5.2 2029 0.072 356.9 2030 0.087 351.5 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
19559+2500	COU1037		1992	5	176	0.1	10.30	10.30	G0	O	195553.36+250009.4
19559+2500	COU1037		2007	6	159	0.1	9.80	10.70	G0 G5	NOD	195553.36+250009.4
19559+2500	COU1037		2008	7	161	0.1	9.80	10.70	G0 G5	NOD	195553.36+250009.4

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