20300-7739 HDS 2931 (HD 193698)

20^h 29^m 58.35^s -77° 39' 25.6" P.A. 97.00 sep 0.1 mag 9.57,10.33 Sp F3V dist. 208.77 pc (681.01 l.y.)

Coord 2000	20300-7739		Discov num	HDS2931		Comp			Coord arcsec 2000	20 29 58.35 -77 39 25.6
Date first	1991		Date last	2020		Obs	7
Pa first	236		Pa last	96.7		P.A. Now (θ)	96.7°
Sep first	0.2		Sep last	0.124		Sep. Now (ρ)	0.124"
Mag pri	9.57		Mag sec	10.33		delta mag (ΔM)	0.76		Spectral class	F3V (yellow-white)
Pri motion ra	-044		Sec motion ra
Pri motion dec	+039		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 193698		Constellation	Octans		HIP	101129		Tycho2	9464-00882-1
Gaia DR2	6362408803897223296		HD	193698		CP	CP-78 1311		Distance	208.77
Distance ly	681.01

ORBITAL ELEMENTS

Period (P)	140y		Periastron (T)	2010.73y		Semi-major axis (a)	0.213a
Eccentricity (e)	0.645		Inclination (i)	38°		Longitude of periastron (ω)	309.3°
Node (Ω)	54.7°		Notes			Reference	Tok2020g
Equinox	2000		Last observation	2019		Grade	5	(1=Definitive, 9=Indet.)

label	theta	rho
2000	257.1	0.137
2001	261.1	0.128
2002	265.8	0.118
2003	271.3	0.108
2004	278.0	0.098
2005	286.1	0.088
2006	296.3	0.079
2007	308.8	0.071
2008	324.0	0.066
2009	341.1	0.063
2010	358.7	0.064
2011	15.0	0.068
2012	29.2	0.073
2013	41.2	0.080
2014	51.5	0.086
2015	60.3	0.092
2016	68.1	0.098
2017	75.0	0.104
2018	81.2	0.109
2019	86.8	0.114
2020	92.0	0.119
2021	96.8	0.123
2022	101.3	0.128
2023	105.4	0.133
2024	109.2	0.137
2025	112.9	0.142
2026	116.2	0.146
2027	119.4	0.151
2028	122.4	0.155
2029	125.3	0.159
2030	128.0	0.164

grafico orbita

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

wds20300-7739a.png orbit plot

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