19550+4152 HO  581

Coord 2000	19550+4152		Discov num	HO  581		Comp			Coord arcsec 2000	19 54 58.40 +41 52 17.6
Date first	1895		Date last	2006		Obs	118
Pa first	258		Pa last	133		P.A. Now (θ)	24°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.22"
Mag pri	8.03		Mag sec	8.72		delta mag (ΔM)	0.69		Spectral class	G9V (yellow)
Pri motion ra	-044		Sec motion ra
Pri motion dec	+293		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	132.8		Precise sep	0.286		Constellation	Cygnus		SAO	48968
HIP	98001		Tycho2	3145-00504-1		HD	188753		ADS	13125
BD	BD+41 3535		Distance	46.23		Distance ly	150.8		last precise pa	132.8
last precise sep	0.286

Period (P)	25.7y		Periastron (T)	1988.2y		Semi-major axis (a)	0.27a
Eccentricity (e)	0.5		Inclination (i)	34°		Longitude of periastron (ω)	236°
Node (Ω)	43°		Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.364 88.0 2001 0.359 93.6 2002 0.352 99.4 2003 0.342 105.5 2004 0.329 112.0 2005 0.315 119.0 2006 0.299 126.8 2007 0.282 135.5 2008 0.263 145.4 2009 0.244 156.8 2010 0.224 170.2 2011 0.202 186.5 2012 0.176 207.0 2013 0.146 235.4 2014 0.118 279.1 2015 0.128 331.0 2016 0.172 4.7 2017 0.220 24.0 2018 0.260 36.8 2019 0.292 46.4 2020 0.318 54.2 2021 0.337 61.0 2022 0.351 67.2 2023 0.360 73.0 2024 0.364 78.6 2025 0.365 84.1 2026 0.363 89.6 2027 0.357 95.3 2028 0.349 101.2 2029 0.338 107.4 2030 0.325 114.0 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
19550+4152	HO 581		2003	121	111	0.3	8.03	8.72	G9V	NOD	195458.41+415215.0
19550+4152	HO 581		2006	122	133	0.3	8.03	8.72	G9V	NOD	195458.41+415215.0

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