20102+4357 STT 400

Coord 2000	20102+4357		Discov num	STT 400		Comp			Coord arcsec 2000	20 10 13.32 +43 56 44.2
Date first	1843		Date last	2017		Obs	241
Pa first	327		Pa last	329		P.A. Now (θ)	326.2°
Sep first	0.5		Sep last	0.7		Sep. Now (ρ)	0.65"
Mag pri	7.60		Mag sec	9.83		delta mag (ΔM)	2.23		Spectral class	G3V (yellow)
Pri motion ra	+009		Sec motion ra	+009
Pri motion dec	+089		Sec motion dec	+089
Notes	N O (See Notes, Orbital solution)

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

Precise pa	328.7		Precise sep	0.695		Constellation	Cygnus		SAO	49262
HIP	99376		Tycho2	3163-01459-1		Gaia DR2	69591424896		HD	191854
ADS	13461		BD	BD+43 3513		Distance	51.33		Distance ly	167.44
last precise pa	328.7		last precise sep	0.695

Period (P)	85.61y		Periastron (T)	1970.27y		Semi-major axis (a)	0.449a
Eccentricity (e)	0.488		Inclination (i)	116.4°		Longitude of periastron (ω)	339.4°
Node (Ω)	142.2°		Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.491 345.0 2001 0.506 343.6 2002 0.522 342.4 2003 0.536 341.2 2004 0.549 340.1 2005 0.562 339.0 2006 0.574 338.0 2007 0.585 337.0 2008 0.595 336.1 2009 0.605 335.2 2010 0.613 334.3 2011 0.621 333.4 2012 0.628 332.6 2013 0.634 331.7 2014 0.639 330.9 2015 0.643 330.1 2016 0.646 329.3 2017 0.648 328.6 2018 0.649 327.8 2019 0.650 327.0 2020 0.649 326.2 2021 0.647 325.4 2022 0.644 324.6 2023 0.641 323.8 2024 0.636 323.0 2025 0.630 322.2 2026 0.623 321.4 2027 0.615 320.5 2028 0.605 319.6 2029 0.595 318.7 2030 0.583 317.8 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
20102+4357	STT 400		2007	230	336	0.6	7.60	9.83	G3V	NOD	201013.32+435644.2
20102+4357	STT 400		2008	234	335	0.6	7.60	9.83	G3V	NOD	201013.32+435644.2
20102+4357	STT 400		2010	235	333	0.6	7.60	9.83	G3V	NOD	201013.32+435644.2
20102+4357	STT 400		2012	235	333	0.7	7.60	9.83	G3V	NOD	201013.32+435644.2
20102+4357	STT 400		2013	237	330	0.6	7.60	9.83	G3V	NO	201013.32+435644.2
20102+4357	STT 400		2016	238	329	0.7	7.60	9.83	G3V	NO	201013.32+435644.2
20102+4357	STT 400		2017	240	329	0.7	7.60	9.83	G3V	NO	201013.32+435644.2

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