17355-5042 CPO 535 (Ome Dra)

Coord 2000	17355-5042		Discov num	CPO 535		Comp			Coord arcsec 2000	17 35 30.18 -50 41 47.4
Date first	1905		Date last	2016		Obs	7
Pa first	148		Pa last	157.6		P.A. Now (θ)	157.6°
Sep first	3.0		Sep last	3.955		Sep. Now (ρ)	3.955"
Mag pri	12.50		Mag sec	13.30		delta mag (ΔM)	0.8		Spectral class
Pri motion ra	+008		Sec motion ra	+029
Pri motion dec	+004		Sec motion dec	-038
Notes

rPM=0.982 This double is not physical.

Name	Ome Dra		Spectr	F5V		Constellation	Ara		SAO	17576
HIP	86201		Tycho2	4428-01960-1		Gaia DR2	5946373356501854720		HD	160922
HR	6596		GC	23944		GL	NN 4017		BD	BD+68 949
Bayer	Omega Draconis		Bayer name	Ome Dra		FK5	664		Distance	23.16
Distance ly	75.55		Bayer greek	ω Dra

Bayer or Flamsteed indentifiers not always match the correct constellation because of procession and proper motion of the star. (Dra vs Ara)

Period (P)	5.279777d	± 0.000004	Periastron (T)	54348.583m (2007.679y)	± 0.083	Semi-major axis (a)	3.469m	± 0.017
Eccentricity (e)	0.0022	± 0.00031	Inclination (i)	151.4°	± 1.1	Longitude of periastron (ω)	314.8°	± 5.6
Node (Ω)	1.23°	± 0.32	Notes	n		Reference	Knc2010
Equinox	2000		Last observation			Grade	8	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 127.4 0.003 2001-01-01 56.4 0.003 2002-01-01 356.3 0.003 2003-01-01 294.2 0.003 2004-01-01 224.3 0.003 2005-01-01 166.2 0.003 2006-01-01 101.6 0.003 2007-01-01 32.7 0.003 2008-01-01 335.1 0.003 2009-01-01 267.7 0.003 2010-01-01 201.9 0.003 2011-01-01 144.4 0.003 2012-01-01 74.8 0.003 2013-01-01 11.1 0.003 2014-01-01 312.1 0.003 2015-01-01 241.6 0.003 2016-01-01 181.0 0.003 2017-01-01 120.2 0.003 2018-01-01 49.3 0.003 2019-01-01 350.3 0.003 2020-01-01 286.7 0.003 2021-01-01 217.6 0.003 2022-01-01 160.1 0.003 2023-01-01 93.8 0.003 2024-01-01 26.3 0.003 2025-01-01 328.7 0.003 2026-01-01 260.1 0.003 2027-01-01 195.8 0.003 2028-01-01 137.7 0.003 2029-01-01 67.2 0.003 2030-01-01 5.1 0.003		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic