17520+1520 STT 338 AB (HD 162734)

Coord 2000	17520+1520		Discov num	STT 338		Comp	AB		Coord arcsec 2000	17 51 58.46 +15 19 34.9
Date first	1843		Date last	2018		Obs	307
Pa first	223		Pa last	167.7		P.A. Now (θ)	167.7°
Sep first	0.6		Sep last	0.9		Sep. Now (ρ)	0.9"
Mag pri	7.21		Mag sec	7.38		delta mag (ΔM)	0.17		Spectral class	G8III (yellow)
Pri motion ra	-002		Sec motion ra	-002
Pri motion dec	+043		Sec motion dec	+043
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 162734	103161	17 51 58 +15 19 35	STT 338 AB	2018	307	168	0.9	7.21	7.38	0.17	Y	<===
Show		103161	17 51 58 +15 19 35	STT 338 AC	2015	6	202	32.6	7.21	13.10	5.89
Show		103161	17 51 58 +15 19 35	STT 338 AD	2015	7	247	96.3	7.21	11.60	4.39

Quadruple system
4 estimated visually detectable stars in this system

Name	HD 162734		Constellation	Hercules		SAO	103161		HIP	87427
Tycho2	1552-02535-1		Gaia DR2	4500935858592797056		HD	162734		HR	6665
GC	24281		ADS	10850		BD	BD+15 3292		Distance	234.19
Distance ly	763.93

Period (P)	1276.6y		Periastron (T)	1799.9y		Semi-major axis (a)	1.14a
Eccentricity (e)	0.582		Inclination (i)	124.2°		Longitude of periastron (ω)	111.1°
Node (Ω)	28.2°		Notes	n		Reference	Pru2012
Equinox	2000		Last observation	2010		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 167.9 0.824 2001 167.6 0.824 2002 167.4 0.824 2003 167.1 0.825 2004 166.9 0.825 2005 166.6 0.825 2006 166.4 0.826 2007 166.1 0.826 2008 165.9 0.826 2009 165.6 0.827 2010 165.4 0.827 2011 165.1 0.827 2012 164.9 0.828 2013 164.7 0.828 2014 164.4 0.828 2015 164.2 0.829 2016 163.9 0.829 2017 163.7 0.829 2018 163.4 0.830 2019 163.2 0.830 2020 163.0 0.830 2021 162.7 0.831 2022 162.5 0.831 2023 162.2 0.831 2024 162.0 0.832 2025 161.7 0.832 2026 161.5 0.832 2027 161.3 0.833 2028 161.0 0.833 2029 160.8 0.833 2030 160.5 0.833		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic