20157+4339 A  2095AB

Coord 2000	20157+4339		Discov num	A  2095		Comp	AB		Coord arcsec 2000	20 15 40.26 +43 38 59.6
Date first	1909		Date last	2009		Obs	22
Pa first	326		Pa last	336		P.A. Now (θ)	153°
Sep first	0.2		Sep last	0.3		Sep. Now (ρ)	0.28"
Mag pri	9.06		Mag sec	9.82		delta mag (ΔM)	0.76		Spectral class	F5 (yellow-white)
Pri motion ra	+013		Sec motion ra
Pri motion dec	-012		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49388	20157+4339	A 2095	AB	1909	2009	22	153	0.3	9.06	9.82	0.76	Y	<===
Show		49388	20157+4339	STF2659	AB,C	1828	2019	34	312	2.7	8.61	10.82	2.21
Show		49388	20157+4339	STF2659	AB,D	1828	2019	27	252	20.5	8.61	9.83	1.22
Show		49388	20157+4339	FOX 39	DE	1915	2015	5	135	1.4	9.83	13.10	3.27
Show		49388	20157+4339	A 2095	DF	1892	2015	13	48	7.6	9.83	13.80	3.97

Sextuple system
7 visible stars in this system

Precise pa	335.9		Precise sep	0.26		Constellation	Cygnus		SAO	49388
HIP	99862		Gaia DR2	35711861760		HD	192911		ADS	13611
BD	BD+43 3543		Distance	255.75		Distance ly	834.26		last precise pa	335.9
last precise sep	0.26

Period (P)	148.58y		Periastron (T)	2049.9y		Semi-major axis (a)	0.345a
Eccentricity (e)	0.758		Inclination (i)	94.5°		Longitude of periastron (ω)	101.6°
Node (Ω)	147.5°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.238 157.2 2001 0.242 156.9 2002 0.245 156.7 2003 0.248 156.4 2004 0.251 156.2 2005 0.255 155.9 2006 0.258 155.7 2007 0.260 155.5 2008 0.263 155.3 2009 0.266 155.1 2010 0.268 154.9 2011 0.271 154.7 2012 0.273 154.5 2013 0.275 154.3 2014 0.277 154.1 2015 0.278 153.9 2016 0.280 153.7 2017 0.281 153.5 2018 0.282 153.3 2019 0.283 153.1 2020 0.284 153.0 2021 0.285 152.8 2022 0.285 152.6 2023 0.285 152.4 2024 0.284 152.2 2025 0.284 152.0 2026 0.283 151.9 2027 0.282 151.7 2028 0.280 151.5 2029 0.278 151.3 2030 0.275 151.1 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
20157+4339	A 2095	AB	1997	19	149	0.2	8.90	8.90	F5	NO	201540.26+433859.6
20157+4339	A 2095	AB	2009	20	156	0.3	8.90	8.90	F5	NO	201540.26+433859.6

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