19083+5520 D    19AB

Coord 2000	19083+5520		Discov num	D    19		Comp	AB		Coord arcsec 2000	19 08 20.20 +55 19 50.0
Date first	1874		Date last	2011		Obs	40
Pa first	20		Pa last	348		P.A. Now (θ)	341.5°
Sep first	0.7		Sep last	0.5		Sep. Now (ρ)	0.48"
Mag pri	7.67		Mag sec	9.51		delta mag (ΔM)	1.84		Spectral class	A5IV (white)
Pri motion ra	+002		Sec motion ra
Pri motion dec	+019		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		31417	19083+5520	D 19	AB	1874	2011	40	342	0.5	7.67	9.51	1.84	Y	<===
Show		31417	19083+5520	STF2479	AB,C	1828	2017	50	29	6.5	7.49	9.68	2.19
Show		31417	19083+5520	GUI 22	AB,D	1911	2006	6	121	65.9	7.49	12.30	4.81

Quadruple system
5 visible stars in this system

Precise pa	348.1		Precise sep	0.483		Constellation	Cygnus		SAO	31417
HIP	94000		Tycho2	3924-01546-1		Gaia DR2	2141186886644505600		HD	179142
ADS	12104		BD	BD+55 2152		Distance	119.62		Distance ly	390.2
last precise pa	348.1		last precise sep	0.483

Period (P)	2858y		Periastron (T)	1903y		Semi-major axis (a)	2.95a
Eccentricity (e)	0.73		Inclination (i)	100°		Longitude of periastron (ω)	162°
Node (Ω)	190°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.582 350.4 2001 0.576 350.0 2002 0.571 349.6 2003 0.565 349.2 2004 0.560 348.8 2005 0.555 348.4 2006 0.549 347.9 2007 0.544 347.5 2008 0.538 347.1 2009 0.533 346.6 2010 0.528 346.1 2011 0.522 345.7 2012 0.517 345.2 2013 0.511 344.7 2014 0.506 344.2 2015 0.501 343.7 2016 0.495 343.1 2017 0.490 342.6 2018 0.485 342.1 2019 0.479 341.5 2020 0.474 340.9 2021 0.469 340.3 2022 0.464 339.7 2023 0.458 339.1 2024 0.453 338.5 2025 0.448 337.9 2026 0.443 337.2 2027 0.438 336.5 2028 0.433 335.9 2029 0.428 335.2 2030 0.423 334.4 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
19083+5520	D 19	AB	1991	36	355	0.6	7.67	9.51	A5IV	N D	190820.20+551950.0
19083+5520	D 19	AB	2006	37	349	0.5	7.67	9.51	A5IV	N D	190820.20+551950.0
19083+5520	D 19	AB	2008	38	348	0.5	7.67	9.51	A5IV	N D	190820.20+551950.0
19083+5520	D 19	AB	2009	39	346	0.5	7.67	9.51	A5IV	N D	190820.20+551950.0
19083+5520	D 19	AB	2011	40	348	0.5	7.67	9.51	A5IV	NO	190820.20+551950.0

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