17161+2316 COU 315

 
 
17h 16m 07.60s +23° 15' 36.9" P.A. 117.00 sep 0.1 mag 9.30,10.10 Sp K0+K2 dist. 250 pc (815.5 l.y.)
 
 
Coord 2000 17161+2316 Discov num COU 315 Comp Coord arcsec 2000 17 16 07.60 +23 15 36.9
Date first 1968 Date last 2014 Obs 24
Pa first 163 Pa last 117.2 P.A. Now (θ) 117.2°
Sep first 0.2 Sep last 0.1 Sep. Now (ρ) 0.1"
Mag pri 9.30 Mag sec 10.10 delta mag (ΔM) 0.8 Spectral class K0+K2 (yellow-orange/yellow-orange)
Pri motion ra -003 Sec motion ra
Pri motion dec +014 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Hercules HIP 84468 Tycho2 2061-00874-1 Gaia DR2 4568569808114360448
BD BD+23 3071 Distance 250 Distance ly 815.5
 
 
ORBITAL ELEMENTS
 
 
Period (P)90.5y± 1 Periastron (T)2012.83y± 0.05 Semi-major axis (a)0.506a± 0.005
Eccentricity (e)0.975± 0.004 Inclination (i)100.4°± 4 Longitude of periastron (ω)89.3°± 15
Node (Ω)103.4°± 4 Notesn ReferenceDoc2010h
Equinox2000 Last observation2007 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 151.6 0.151
2001 149.8 0.149
2002 147.9 0.146
2003 146.0 0.143
2004 143.9 0.140
2005 141.8 0.136
2006 139.5 0.132
2007 137.0 0.126
2008 134.4 0.120
2009 131.3 0.113
2010 138.1 0.129
2011 123.5 0.090
2012 117.0 0.068
2013 280.5 0.033
2014 268.0 0.080
2015 262.9 0.099
2016 259.2 0.112
2017 154.0 0.154
2018 253.7 0.130
2019 251.4 0.136
2020 249.3 0.142
2021 247.3 0.146
2022 245.5 0.150
2023 243.7 0.154
2024 242.0 0.157
2025 240.4 0.160
2026 238.8 0.163
2027 237.3 0.165
2028 235.8 0.167
2029 234.4 0.169
2030 232.9 0.170


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



 
 


wds17161%2B2316b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic