15394-1355 HDS 2210 (HD 139591)

15^h 39^m 26.44^s -13° 54' 38.8" P.A. 129.00 sep 0.1 mag 8.78,9.09 Sp F7V dist. 76.39 pc (249.18 l.y.)

Coord 2000	15394-1355		Discov num	HDS2210		Comp			Coord arcsec 2000	15 39 26.44 -13 54 38.8
Date first	1991		Date last	2021		Obs	8
Pa first	356		Pa last	128.9		P.A. Now (θ)	68.8°
Sep first	0.2		Sep last	0.076		Sep. Now (ρ)	0.053"
Mag pri	8.78		Mag sec	9.09		delta mag (ΔM)	0.31		Spectral class	F7V (yellow-white)
Pri motion ra	-055		Sec motion ra
Pri motion dec	-160		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 139591		Constellation	Libra		SAO	159415		HIP	76676
Tycho2	5608-00204-1		Gaia DR2	6265527016146835456		HD	139591		BD	BD-13 4216
Distance	76.39		Distance ly	249.18

ORBITAL ELEMENTS

Period (P)	39.188y		Periastron (T)	2017.75y		Semi-major axis (a)	0.174a
Eccentricity (e)	0.065		Inclination (i)	108.2°		Longitude of periastron (ω)	220°
Node (Ω)	351.7°		Notes	n		Reference	Tok2018e
Equinox	2000		Last observation	2018		Grade	3	(1=Definitive, 9=Indet.)

label	theta	rho
2000	327.7	0.116
2001	320.1	0.098
2002	309.0	0.080
2003	292.2	0.065
2004	268.2	0.057
2005	241.7	0.059
2006	220.8	0.071
2007	206.8	0.088
2008	197.4	0.106
2009	190.7	0.123
2010	185.6	0.138
2011	181.5	0.150
2012	177.9	0.159
2013	174.6	0.164
2014	171.4	0.165
2015	168.1	0.161
2016	164.6	0.153
2017	160.6	0.140
2018	155.7	0.125
2019	149.1	0.106
2020	139.6	0.086
2021	124.6	0.067
2022	100.2	0.054
2023	68.8	0.053
2024	43.2	0.065
2025	27.2	0.084
2026	17.3	0.104
2027	10.6	0.124
2028	5.6	0.142
2029	1.7	0.157
2030	358.5	0.168

grafico orbita

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

wds15394-1355a.png orbit plot

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