20104-1923 HDS 2873 (HD 191434)

20^h 10^m 25.46^s -19° 22' 59.4" P.A. 226.00 sep 0.1 mag 7.49,10.22 Sp G0V dist. 61.09 pc (199.28 l.y.)

Coord 2000	20104-1923		Discov num	HDS2873		Comp			Coord arcsec 2000	20 10 25.46 -19 22 59.4
Date first	1991		Date last	2020		Obs	11
Pa first	204		Pa last	225.6		P.A. Now (θ)	225.6°
Sep first	0.2		Sep last	0.136		Sep. Now (ρ)	0.136"
Mag pri	7.49		Mag sec	10.22		delta mag (ΔM)	2.73		Spectral class	G0V (yellow)
Pri motion ra	-004		Sec motion ra
Pri motion dec	-127		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 191434		Constellation	Capricornus		SAO	163313		HIP	99391
Tycho2	6323-02047-1		Gaia DR2	6866542478736575616		HD	191434		GC	27978
BD	BD-19 5731		Distance	61.09		Distance ly	199.28

ORBITAL ELEMENTS

Period (P)	90y		Periastron (T)	2007.46y	± 0.67	Semi-major axis (a)	0.3843a	± 0.0087
Eccentricity (e)	0.484	± 0.006	Inclination (i)	94°	± 0.4	Longitude of periastron (ω)	-0.3°	± 4.3
Node (Ω)	35.2°	± 0.9	Notes			Reference	Tok2016e
Equinox	2000		Last observation			Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	54.8	0.055
2001	46.9	0.083
2002	43.0	0.111
2003	40.6	0.136
2004	38.9	0.159
2005	37.7	0.177
2006	36.6	0.191
2007	35.6	0.197
2008	34.7	0.197
2009	33.8	0.191
2010	32.7	0.177
2011	31.4	0.159
2012	29.8	0.136
2013	27.4	0.111
2014	23.5	0.083
2015	15.6	0.055
2016	352.7	0.029
2017	282.0	0.023
2018	244.1	0.045
2019	233.1	0.073
2020	228.2	0.102
2021	225.5	0.130
2022	223.7	0.158
2023	222.5	0.185
2024	221.6	0.211
2025	220.9	0.237
2026	220.3	0.261
2027	219.8	0.284
2028	219.4	0.307
2029	219.0	0.328
2030	218.7	0.349

grafico orbita

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

wds20104-1923a.png orbit plot

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