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20198+4522
STT 406

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20198+4522 STT 406

20^h 19^m 49.69^s +45° 21' 49.7" P.A. 89.80 sep 0.2 mag 7.25,8.74 Sp F5IV dist. 92.51 pc (301.77 l.y.)

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	159
Pa first	133		Pa last	100		P.A. Now (θ)	89.8°
Sep first	0.6		Sep last	0.3		Sep. Now (ρ)	0.22"
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)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	99.6		Precise sep	0.318		Constellation	Cygnus		SAO	49481
HIP	100241		Tycho2	3572-00337-1		Gaia DR2	2081494847057615104		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

ORBITAL ELEMENTS

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

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds20198%2B4522a.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS HISTORIC DATA

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

If you need more information about this double, apply for a data request form to the WDS.