09290+1917 COU 936 (HD 81899)

 
 
09h 29m 00.67s +19 17' 18.6" P.A. 226.00 sep 1.0 mag 8.42,9.96 Sp F5 dist. 83.13 pc (271.17 l.y.)
 
 
Coord 2000 09290+1917 Discov num COU 936 Comp Coord arcsec 2000 09 29 00.67 +19 17 18.6
Date first 1973 Date last 2017 Obs 20
Pa first 239 Pa last 225.8 P.A. Now (θ) 225.8°
Sep first 0.5 Sep last 0.956 Sep. Now (ρ) 0.956"
Mag pri 8.42 Mag sec 9.96 delta mag (ΔM) 1.54 Spectral class F5 (yellow-white)
Pri motion ra +026 Sec motion ra +026
Pri motion dec +033 Sec motion dec +033
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 81899 Constellation Leo SAO 98596 HIP 46501
Tycho2 1406-01207-1 Gaia DR2 634098255638793600 HD 81899 BD BD+19 2218
Distance 83.13 Distance ly 271.17
 
 
ORBITAL ELEMENTS
 
 
Period (P)180.5y± 16.3 Periastron (T)1945.3y± 2.4 Semi-major axis (a)0.565a± 0.032
Eccentricity (e)0.738± 0.065 Inclination (i)108.6°± 5 Longitude of periastron (ω)8.4°± 7.7
Node (Ω)45°± 1.9 Notes ReferenceBAE2021
Equinox Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 227.8 0.864
2001 227.6 0.871
2002 227.4 0.878
2003 227.3 0.885
2004 227.1 0.891
2005 226.9 0.898
2006 226.8 0.904
2007 226.6 0.909
2008 226.4 0.915
2009 226.3 0.920
2010 226.1 0.925
2011 225.9 0.930
2012 225.8 0.934
2013 225.6 0.938
2014 225.5 0.942
2015 225.3 0.946
2016 225.2 0.950
2017 225.0 0.953
2018 224.9 0.956
2019 224.7 0.959
2020 224.6 0.961
2021 224.4 0.964
2022 224.3 0.966
2023 224.1 0.968
2024 224.0 0.969
2025 223.8 0.971
2026 223.7 0.972
2027 223.5 0.973
2028 223.4 0.974
2029 223.2 0.974
2030 223.1 0.975


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



 
 


wds09290%2B1917a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic