17447-4244 FIN 341 (HD 160928)

17^h 44^m 42.01^s -42° 43' 45.5" P.A. 226.00 sep 0.0 mag 6.60,6.60 Sp A1V+F0IV dist. 72.1 pc (235.19 l.y.)

Coord 2000	17447-4244		Discov num	FIN 341		Comp			Coord arcsec 2000	17 44 42.01 -42 43 45.5
Date first	1957		Date last	2021		Obs	18
Pa first	6		Pa last	225.6		P.A. Now (θ)	225.6°
Sep first	0.1		Sep last	0.028		Sep. Now (ρ)	0.028"
Mag pri	6.60		Mag sec	6.60		delta mag (ΔM)	0		Spectral class	A1V+F0IV (white/yellow-white)
Pri motion ra	-001		Sec motion ra
Pri motion dec	+010		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 160928		Constellation	Scorpius		SAO	228363		HIP	86847
Tycho2	7893-02172-1		Gaia DR2	5957213823943185152		HD	160928		HR	6597
GC	24054		CD	CD-4212431		CP	CP-42 7927		Distance	72.1
Distance ly	235.19

ORBITAL ELEMENTS

Period (P)	15.12y	± 0.1	Periastron (T)	2012.71y	± 0.68	Semi-major axis (a)	0.1183a	± 0.0049
Eccentricity (e)	0.165	± 0.038	Inclination (i)	81.7°	± 1.6	Longitude of periastron (ω)	244.6°	± 14.4
Node (Ω)	179.5°	± 0.8	Notes	n		Reference	Tok2017b
Equinox	2000		Last observation			Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	172.5	0.085
2001	177.2	0.114
2002	180.5	0.125
2003	183.6	0.119
2004	187.6	0.098
2005	194.7	0.067
2006	217.1	0.032
2007	311.0	0.026
2008	343.3	0.059
2009	352.0	0.090
2010	356.8	0.107
2011	0.9	0.104
2012	6.6	0.076
2013	26.8	0.030
2014	154.2	0.033
2015	171.7	0.080
2016	176.8	0.112
2017	180.1	0.125
2018	183.2	0.120
2019	187.0	0.101
2020	193.5	0.071
2021	212.1	0.036
2022	301.1	0.023
2023	341.6	0.055
2024	351.3	0.087
2025	356.3	0.106
2026	0.4	0.105
2027	5.7	0.081
2028	21.5	0.036
2029	147.8	0.027
2030	170.7	0.075

grafico orbita

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

wds17447-4244e.png orbit plot

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