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)	56.9°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.31"
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)

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

Precise pa	132.8		Precise sep	0.286		Constellation	Cygnus		SAO	48968
HIP	98001		Tycho2	3145-00504-1		Gaia DR2	56940805248		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)	25.63y	± 0.04	Periastron (T)	1988.1y	± 0.1	Semi-major axis (a)	258.7m	± 2.8
Eccentricity (e)	0.502	± 0.008	Inclination (i)	31.1°	± 1.5	Longitude of periastron (ω)	233.8°	± 1.3
Node (Ω)	45.7°	± 1.1	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2006

label rho theta 2000 0.357 90.1 2001 0.353 95.7 2002 0.346 101.3 2003 0.337 107.3 2004 0.325 113.7 2005 0.311 120.6 2006 0.294 128.2 2007 0.276 136.7 2008 0.257 146.5 2009 0.236 158.0 2010 0.214 171.8 2011 0.190 188.9 2012 0.164 211.1 2013 0.135 242.5 2014 0.114 289.3 2015 0.132 338.2 2016 0.174 8.8 2017 0.218 27.1 2018 0.255 39.6 2019 0.286 49.1 2020 0.310 56.9 2021 0.328 63.7 2022 0.342 69.9 2023 0.351 75.7 2024 0.356 81.2 2025 0.357 86.7 2026 0.356 92.2 2027 0.351 97.7 2028 0.343 103.5 2029 0.332 109.6 2030 0.320 116.2 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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