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20202-3435
I 1416

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

20202-3435 I 1416

20^h 20^m 14.47^s -34° 35' 06.6" P.A. 332.90 sep 0.1 mag 7.09,8.19 Sp F8V dist. 62.19 pc (202.86 l.y.)

Coord 2000	20202-3435		Discov num	I 1416		Comp			Coord arcsec 2000	20 20 14.47 -34 35 06.6
Date first	1925		Date last	2019		Obs	40
Pa first	213		Pa last	253		P.A. Now (θ)	332.9°
Sep first	0.3		Sep last	0.0		Sep. Now (ρ)	0.05"
Mag pri	7.09		Mag sec	8.19		delta mag (ΔM)	1.1		Spectral class	F8V (yellow-white)
Pri motion ra	+053		Sec motion ra
Pri motion dec	-060		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	252.9		Precise sep	0.044		Constellation	Sagittarius		SAO	212015
HIP	100266		Tycho2	7450-01687-1		Gaia DR2	6696275578391882368		HD	193194
CD	CD-3414287		CP	CP-34 8654		Distance	62.19		Distance ly	202.86
last precise pa	252.9		last precise sep	0.044

ORBITAL ELEMENTS

Period (P)	20.29y	± 0.14	Periastron (T)	2000.31y	± 0.23	Semi-major axis (a)	0.167a	± 0.007
Eccentricity (e)	0.887	± 0.036	Inclination (i)	112.9°	± 2.5	Longitude of periastron (ω)	38.5°	± 5.8
Node (Ω)	140°	± 4.7	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2021

label	rho	theta
2000	0.025	178.1
2001	0.075	325.6
2002	0.141	317.7
2003	0.183	314.3
2004	0.212	312.0
2005	0.233	310.2
2006	0.248	308.7
2007	0.258	307.3
2008	0.263	306.0
2009	0.264	304.7
2010	0.261	303.4
2011	0.254	302.1
2012	0.244	300.6
2013	0.231	299.1
2014	0.213	297.3
2015	0.193	295.1
2016	0.168	292.4
2017	0.139	288.6
2018	0.105	282.5
2019	0.066	269.8
2020	0.028	217.4
2021	0.046	332.9
2022	0.125	319.1
2023	0.172	315.1
2024	0.205	312.6
2025	0.228	310.7
2026	0.245	309.1
2027	0.256	307.7
2028	0.262	306.3
2029	0.264	305.1
2030	0.262	303.8

grafico orbita

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

wds20202-3435c.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
20202-3435	I 1416		1991	31	303	0.2	7.09	8.19	F8V	NO	202014.47-343506.6
20202-3435	I 1416		2008	33	305	0.3	7.09	8.19	F8V	NO	202014.47-343506.6
20202-3435	I 1416		2013	36	298	0.2	7.09	8.19	F8V	NO	202014.47-343506.6
20202-3435	I 1416		2015	37	294	0.2	7.09	8.19	F8V	O	202014.47-343506.6
20202-3435	I 1416		2017	38	285	0.1	7.09	8.19	F8V	O	202014.47-343506.6
20202-3435	I 1416		2018	39	278	0.1	7.09	8.19	F8V	O	202014.47-343506.6
20202-3435	I 1416		2019	40	253	0.0	7.09	8.19	F8V	O	202014.47-343506.6

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