17157-0949 TOK 53 Ba,Bb

Coord 2000	17157-0949		Discov num	TOK  53		Comp	Ba,Bb		Coord arcsec 2000	17 15 41.08 -09 48 31.9
Date first	2009		Date last	2021		Obs	21
Pa first	131		Pa last	278.5		P.A. Now (θ)	209.1°
Sep first	0.0		Sep last	0.03		Sep. Now (ρ)	0.038"
Mag pri	10.40		Mag sec	10.60		delta mag (ΔM)	0.2		Spectral class	F9IV (yellow-white)
Pri motion ra	-012		Sec motion ra
Pri motion dec	-021		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 156034	141578	17 15 41 -09 48 32	A 2592 AB	2021	88	70	0.2	7.15	9.69	2.54	Y
Show			17 15 41 -09 48 32	TOK 53 Ba,Bb	2021	21	279	0.0	10.40	10.60	0.20	Y	<===

Triple system
2 estimated visually detectable stars in this system

Constellation	Ophiuchus		HIP	84430		Tycho2	5649-00907-1		Gaia DR2	4143293519539985536
HD	156034		ADS	10423		BD	BD-09 4525		Distance	204.08
Distance ly	665.71

Period (P)	5.257y	± 0.052	Periastron (T)	2011.08y	± 0.59	Semi-major axis (a)	0.033a	± 0.008
Eccentricity (e)	0.46	± 0.11	Inclination (i)	138.6°	± 24.9	Longitude of periastron (ω)	69°	± 22.5
Node (Ω)	52.3°	± 11.7	Notes	n		Reference	Tok2021b
Equinox			Last observation			Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 67.8 0.025 2001 261.1 0.021 2002 208.1 0.038 2003 176.0 0.039 2004 138.2 0.034 2005 85.9 0.028 2006 303.4 0.015 2007 217.3 0.036 2008 184.3 0.039 2009 149.0 0.035 2010 101.3 0.030 2011 8.0 0.015 2012 227.9 0.033 2013 192.5 0.040 2014 158.9 0.036 2015 115.1 0.031 2016 46.9 0.021 2017 241.9 0.028 2018 200.6 0.039 2019 168.2 0.038 2020 127.8 0.032 2021 70.0 0.026 2022 264.2 0.021 2023 209.1 0.038 2024 176.9 0.039 2025 139.4 0.034 2026 87.7 0.028 2027 310.2 0.014 2028 218.3 0.036 2029 185.2 0.039 2030 150.1 0.035		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic