20151+3742 COU2416

Coord 2000	20151+3742		Discov num	COU2416		Comp			Coord arcsec 2000	20 15 04.77 +37 41 45.1
Date first	1986		Date last	2011		Obs	16
Pa first	232		Pa last	118		P.A. Now (θ)	144.4°
Sep first	0.2		Sep last	0.3		Sep. Now (ρ)	0.28"
Mag pri	8.00		Mag sec	8.50		delta mag (ΔM)	0.5		Spectral class	F0V (yellow-white)
Pri motion ra	+034		Sec motion ra
Pri motion dec	+024		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	117.8		Precise sep	0.3		Constellation	Cygnus		SAO	69696
Tycho2	3151-01432-1		Gaia DR2	24369028224		HD	192744		last precise pa	117.8
last precise sep	0.3

Period (P)	56.88y		Periastron (T)	1995.77y		Semi-major axis (a)	0.223a
Eccentricity (e)	0.477		Inclination (i)	37.8°		Longitude of periastron (ω)	248.7°
Node (Ω)	95.7°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.138 62.7 2001 0.156 72.8 2002 0.173 80.9 2003 0.188 87.6 2004 0.202 93.3 2005 0.215 98.3 2006 0.226 102.8 2007 0.235 106.9 2008 0.244 110.7 2009 0.251 114.3 2010 0.257 117.7 2011 0.262 120.9 2012 0.267 124.1 2013 0.270 127.1 2014 0.273 130.1 2015 0.275 133.0 2016 0.276 135.8 2017 0.277 138.7 2018 0.278 141.5 2019 0.278 144.4 2020 0.277 147.2 2021 0.276 150.1 2022 0.275 152.9 2023 0.273 155.9 2024 0.271 158.8 2025 0.269 161.8 2026 0.266 164.9 2027 0.263 168.0 2028 0.260 171.2 2029 0.257 174.5 2030 0.253 177.8 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
20151+3742	COU2416		2005	12	100	0.2	8.00	8.50	F0V	NO	201504.77+374145.1
20151+3742	COU2416		2007	13	111	0.2	8.00	8.50	F0V	NO	201504.77+374145.1
20151+3742	COU2416		2009	15	117	0.3	8.00	8.50	F0V	NO	201504.77+374145.1
20151+3742	COU2416		2011	16	118	0.3	8.00	8.50	F0V	NO	201504.77+374145.1

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