17490+3704 COU 1145 (HD 162338)

17^h 48^m 58.27^s +37° 03' 43.0" P.A. 283.00 sep 0.2 mag 7.82,8.32 Sp G0 dist. 51.63 pc (168.42 l.y.)

Coord 2000	17490+3704		Discov num	COU1145		Comp			Coord arcsec 2000	17 48 58.27 +37 03 43.0
Date first	1974		Date last	2016		Obs	97
Pa first	101		Pa last	283.4		P.A. Now (θ)	21.3°
Sep first	0.2		Sep last	0.164		Sep. Now (ρ)	0.101"
Mag pri	7.82		Mag sec	8.32		delta mag (ΔM)	0.5		Spectral class	G0 (yellow)
Pri motion ra	+063		Sec motion ra
Pri motion dec	-084		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 162338		Constellation	Hercules		SAO	66352		HIP	87204
Tycho2	2619-00395-1		Gaia DR2	4609010395538738304		HD	162338		GC	24210
BD	BD+37 2949		Distance	51.63		Distance ly	168.42

ORBITAL ELEMENTS

Period (P)	20.7y	± 0.17	Periastron (T)	1988.724y	± 0.026	Semi-major axis (a)	0.1788a	± 0.0014
Eccentricity (e)	0.6081	± 0.0054	Inclination (i)	110.28°	± 0.27	Longitude of periastron (ω)	261.11°	± 0.42
Node (Ω)	136.34°	± 0.47	Notes	n		Reference	Hrt1996a
Equinox	2000		Last observation			Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000	57.5	0.101
2001	41.8	0.097
2002	25.9	0.099
2003	11.2	0.106
2004	358.6	0.115
2005	347.9	0.124
2006	338.6	0.131
2007	329.6	0.129
2008	319.4	0.111
2009	297.3	0.057
2010	159.9	0.054
2011	137.8	0.118
2012	129.4	0.150
2013	123.3	0.164
2014	117.7	0.166
2015	112.0	0.161
2016	105.8	0.153
2017	98.8	0.141
2018	90.3	0.129
2019	80.1	0.116
2020	67.6	0.106
2021	52.9	0.099
2022	37.0	0.097
2023	21.3	0.101
2024	7.2	0.108
2025	355.2	0.118
2026	345.0	0.127
2027	335.9	0.131
2028	326.8	0.126
2029	315.2	0.100
2030	272.7	0.033

grafico orbita

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

wds17490%2B3704a.png orbit plot

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