18035+4032 COU 1785 (HD 165311)

 
 
18h 03m 31.83s +40° 32' 00.6" P.A. 30.00 sep 0.2 mag 8.70,8.90 Sp F5
 
 
Coord 2000 18035+4032 Discov num COU1785 Comp Coord arcsec 2000 18 03 31.83 +40 32 00.6
Date first 1978 Date last 2016 Obs 20
Pa first 50 Pa last 30.4 P.A. Now (θ) 45.9°
Sep first 0.2 Sep last 0.166 Sep. Now (ρ) 0.186"
Mag pri 8.70 Mag sec 8.90 delta mag (ΔM) 0.2 Spectral class F5 (yellow-white)
Pri motion ra -005 Sec motion ra
Pri motion dec +005 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 165311 Constellation Hercules SAO 47175 Tycho2 3106-00845-1
Gaia DR2 4611379808736923264 HD 165311
 
 
ORBITAL ELEMENTS
 
 
Period (P)45.72y± 0.5 Periastron (T)1995y± 0.5 Semi-major axis (a)0.135a± 0.002
Eccentricity (e)0.483± 0.003 Inclination (i)65.7°± 1 Longitude of periastron (ω)147°± 3
Node (Ω)52.8°± 1 Notesn ReferenceDoc2008a
Equinox2000 Last observation2005 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 268.9 0.065
2001 282.3 0.060
2002 297.8 0.056
2003 314.3 0.056
2004 329.7 0.060
2005 342.9 0.066
2006 353.5 0.074
2007 1.9 0.084
2008 8.5 0.094
2009 13.8 0.104
2010 18.2 0.114
2011 21.9 0.123
2012 25.0 0.133
2013 27.8 0.141
2014 30.2 0.149
2015 32.4 0.157
2016 34.5 0.163
2017 36.3 0.169
2018 38.1 0.174
2019 39.7 0.179
2020 41.3 0.182
2021 42.9 0.184
2022 44.4 0.186
2023 45.9 0.186
2024 47.4 0.186
2025 48.9 0.184
2026 50.4 0.181
2027 52.1 0.176
2028 53.8 0.171
2029 55.6 0.164
2030 57.7 0.155


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



 
 


wds18035%2B4032d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic