20229+4259 HO  128AB

Coord 2000	20229+4259		Discov num	HO  128		Comp	AB		Coord arcsec 2000	20 22 55.49 +42 59 00.4
Date first	1886		Date last	2016		Obs	37
Pa first	35		Pa last	357		P.A. Now (θ)	356.1°
Sep first	1.0		Sep last	1.4		Sep. Now (ρ)	1.33"
Mag pri	6.41		Mag sec	8.82		delta mag (ΔM)	2.41		Spectral class	G8III (yellow)
Pri motion ra	+055		Sec motion ra	+055
Pri motion dec	+039		Sec motion dec	+039
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49550	20 22 55 +42 59 00	HO 128 AB	2016	37	356	1.3	6.41	8.82	2.41	Y	<===
Show		49550	20 22 55 +42 59 00	STTA 207 AC	2017	30	65	85.8	6.41	8.01	1.60
Show		49555	20 23 03 +42 59 38	STTA 207 CD	2015	9	162	56.1	8.01	14.43	6.42

Quadruple system
4 visible stars in this system

Precise pa	357.1		Precise sep	1.383		Constellation	Cygnus		SAO	49550
HIP	100515		Tycho2	3160-01936-1		Gaia DR2	2069136233279278720		HD	194220
HR	7802		ADS	13786		BD	BD+42 3721		Distance	102.99
Distance ly	335.95		last precise pa	357.1		last precise sep	1.383

Period (P)	1027.9807y	± 507.5142	Periastron (T)	2080.6251y	± 32.5694	Semi-major axis (a)	2.6928a	± 1.91925
Eccentricity (e)	0.70717	± 0.24844	Inclination (i)	103.488°	± 8.825	Longitude of periastron (ω)	248.513°	± 20.476
Node (Ω)	167.665°	± 5.068	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox			Last observation	2013

label rho theta 2000 1.362 1.0 2001 1.362 0.7 2002 1.361 0.5 2003 1.361 0.3 2004 1.361 0.1 2005 1.360 359.8 2006 1.359 359.6 2007 1.358 359.4 2008 1.357 359.1 2009 1.356 358.9 2010 1.355 358.7 2011 1.353 358.5 2012 1.352 358.2 2013 1.350 358.0 2014 1.348 357.8 2015 1.345 357.5 2016 1.343 357.3 2017 1.340 357.1 2018 1.337 356.8 2019 1.334 356.6 2020 1.331 356.4 2021 1.327 356.1 2022 1.324 355.9 2023 1.320 355.7 2024 1.315 355.4 2025 1.311 355.2 2026 1.306 354.9 2027 1.301 354.7 2028 1.296 354.4 2029 1.290 354.2 2030 1.284 353.9		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
20229+4259	HO 128	AB	2003	28	360	1.4	6.41	8.82	G8III	N D	202255.49+425900.4
20229+4259	HO 128	AB	2006	29	359	1.4	6.41	8.82	G8III	N D	202255.49+425900.4
20229+4259	HO 128	AB	2010	32	358	1.4	6.41	8.82	G8III	N D	202255.49+425900.4
20229+4259	HO 128	AB	2013	33	359	1.3	6.41	8.82	G8III	N D	202255.49+425900.4
20229+4259	HO 128	AB	2015	36	358	1.4	6.41	8.82	G8III	N	202255.49+425900.4

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