18439-0649 YSC 133 (HD 173093)

18^h 43^m 51.22^s -06° 49' 04.8" P.A. 245.00 sep 0.0 mag 6.70,7.60 Sp F7V dist. 73.8 pc (240.74 l.y.)

Coord 2000	18439-0649		Discov num	YSC 133		Comp			Coord arcsec 2000	18 43 51.22 -06 49 04.8
Date first	2008		Date last	2021		Obs	22
Pa first	171		Pa last	245.3		P.A. Now (θ)	167.5°
Sep first	0.0		Sep last	0.046		Sep. Now (ρ)	0.033"
Mag pri	6.70		Mag sec	7.60		delta mag (ΔM)	0.9		Spectral class	F7V (yellow-white)
Pri motion ra	+030		Sec motion ra
Pri motion dec	-045		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 173093		Constellation	Scutum		SAO	142557		HIP	91880
Tycho2	5125-00544-1		Gaia DR2	4253157958461105664		HD	173093		HR	7034
GC	25617		BD	BD-06 4859		Distance	73.8		Distance ly	240.74

ORBITAL ELEMENTS

Period (P)	2642.5d (7.23y)	± 1.5	Periastron (T)	55470.035d (2010.748y)	± 0.63	Semi-major axis (a)	80.09m	± 0.99
Eccentricity (e)	0.6109	± 0.0013	Inclination (i)	104.55°	± 0.27	Longitude of periastron (ω)	254.98°	± 0.17
Node (Ω)	286.62°	± 0.66	Notes			Reference	Hor2021b
Equinox			Last observation			Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000-01-01	240.2	0.043
2001-01-01	186.6	0.031
2002-01-01	136.1	0.045
2003-01-01	111.0	0.049
2004-01-01	290.7	0.048
2005-01-01	276.5	0.079
2006-01-01	265.5	0.070
2007-01-01	247.2	0.049
2008-01-01	202.3	0.031
2009-01-01	144.4	0.040
2010-01-01	116.6	0.053
2011-01-01	302.0	0.026
2012-01-01	279.0	0.077
2013-01-01	268.4	0.074
2014-01-01	252.9	0.054
2015-01-01	216.7	0.034
2016-01-01	154.8	0.036
2017-01-01	122.0	0.052
2018-01-01	53.3	0.010
2019-01-01	281.7	0.072
2020-01-01	271.0	0.077
2021-01-01	257.5	0.059
2022-01-01	228.6	0.037
2023-01-01	167.5	0.033
2024-01-01	127.7	0.050
2025-01-01	100.3	0.033
2026-01-01	284.8	0.065
2027-01-01	273.5	0.078
2028-01-01	261.4	0.064
2029-01-01	238.1	0.042
2030-01-01	182.5	0.031

grafico orbita

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

wds18439-0649d.png orbit plot

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