20198+4522 STT 406

Coord 2000	20198+4522		Discov num	STT 406		Comp			Coord arcsec 2000	20 19 49.69 +45 21 49.7
Date first	1845		Date last	2011		Obs	158
Pa first	133		Pa last	100		P.A. Now (θ)	92°
Sep first	0.6		Sep last	0.3		Sep. Now (ρ)	0.24"
Mag pri	7.25		Mag sec	8.74		delta mag (ΔM)	1.49		Spectral class	F5IV (yellow-white)
Pri motion ra	+018		Sec motion ra	+018
Pri motion dec	-029		Sec motion dec	-029
Notes	N O (See Notes, Orbital solution)

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

Precise pa	99.6		Precise sep	0.318		Constellation	Cygnus		SAO	49481
HIP	100241		Tycho2	3572-00337-1		Gaia DR2	47057615104		HD	193701
ADS	13723		BD	BD+44 3429		Distance	92.51		Distance ly	301.77
last precise pa	99.6		last precise sep	0.318

Period (P)	113.5y		Periastron (T)	1914.5y		Semi-major axis (a)	0.336a
Eccentricity (e)	0.85		Inclination (i)	128.7°		Longitude of periastron (ω)	151.5°
Node (Ω)	101.3°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1975

label rho theta 2000 0.502 109.2 2001 0.495 108.7 2002 0.487 108.2 2003 0.479 107.7 2004 0.470 107.2 2005 0.460 106.7 2006 0.451 106.1 2007 0.440 105.5 2008 0.429 104.9 2009 0.418 104.2 2010 0.406 103.5 2011 0.393 102.8 2012 0.380 102.0 2013 0.366 101.1 2014 0.351 100.2 2015 0.335 99.2 2016 0.319 98.1 2017 0.301 96.9 2018 0.282 95.5 2019 0.262 93.9 2020 0.241 92.0 2021 0.218 89.8 2022 0.193 87.0 2023 0.166 83.3 2024 0.137 78.2 2025 0.105 70.0 2026 0.070 53.9 2027 0.041 10.9 2028 0.047 300.1 2029 0.060 259.4 2030 0.068 230.6 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
20198+4522	STT 406		2007	165	101	0.3	7.25	8.74	F5IV	NOD	201949.69+452149.7
20198+4522	STT 406		2009	168	102	0.3	7.25	8.74	F5IV	NOD	201949.69+452149.7
20198+4522	STT 406		2011	173	100	0.3	7.25	8.74	F5IV	NO	201949.69+452149.7

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