19556+5226 YR 2 Aa,Ab

19^h 55^m 37.82^s +52° 26' 20.5" P.A. 45.00 sep 0.1 mag 5.60,6.10 Sp A4Vn dist. 86.28 pc (281.45 l.y.)

Coord 2000	19556+5226		Discov num	YR 2		Comp	Aa,Ab		Coord arcsec 2000	19 55 37.82 +52 26 20.5
Date first	1996		Date last	2010		Obs	16
Pa first	106		Pa last	45		P.A. Now (θ)	45°
Sep first	0.1		Sep last	0.111		Sep. Now (ρ)	0.111"
Mag pri	5.60		Mag sec	6.10		delta mag (ΔM)	0.5		Spectral class	A4Vn (white)
Pri motion ra	-034		Sec motion ra
Pri motion dec	-022		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

19556+5226 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		32114	19 55 38 +52 26 20	YR 2 Aa,Ab	2010	16	45	0.1	5.60	6.10	0.50	Y	<===
Show	Psi Cyg	32114	19 55 38 +52 26 20	STF 2605 AB	2017	132	175	2.9	5.03	7.52	2.49
Show		32114	19 55 38 +52 26 20	STF 2605 AC	2003	5	53	23.9	5.03	13.80	8.77
Show		32114	19 55 38 +52 26 20	STF 2605 AD	2003	8	60	169.8	5.03	11.31	6.28

Quintuple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Cygnus		SAO	32114		HIP	98055		Tycho2	3570-02426-1
Gaia DR2	2089092884718210432		HD	189037		HR	7619		GC	27618
ADS	13148		BD	BD+52 2572		Bayer	Psi Cygni		Bayer name	Psi Cyg
Flamsteed	24 Cygni		Flamsteed name	24 Cyg		Distance	86.28		Distance ly	281.45
Bayer greek	ψ Cyg

ORBITAL ELEMENTS

Period (P)	54.08y		Periastron (T)	2016.9y		Semi-major axis (a)	0.141a
Eccentricity (e)	0.484		Inclination (i)	113°		Longitude of periastron (ω)	259.9°
Node (Ω)	216.7°		Notes	n		Reference	Hrt2013c
Equinox	2000		Last observation	2010		Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	85.7	0.092
2001	80.5	0.096
2002	75.8	0.099
2003	71.3	0.103
2004	67.2	0.107
2005	63.4	0.110
2006	59.7	0.112
2007	56.2	0.114
2008	52.7	0.115
2009	49.3	0.115
2010	45.8	0.113
2011	42.1	0.109
2012	38.1	0.102
2013	33.3	0.093
2014	27.2	0.080
2015	18.3	0.063
2016	2.1	0.044
2017	326.3	0.030
2018	275.1	0.033
2019	247.7	0.051
2020	235.0	0.070
2021	227.6	0.087
2022	222.5	0.101
2023	218.5	0.113
2024	215.2	0.122
2025	212.4	0.129
2026	209.7	0.134
2027	207.3	0.137
2028	204.9	0.139
2029	202.6	0.140
2030	200.2	0.139

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds19556%2B5226a.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic