11158+4227 COU 1904 (HD 97857)

 
 
11h 15m 49.68s +42° 26' 58.1" P.A. 212.00 sep 0.6 mag 8.33,9.46 Sp F8
 
 
Coord 2000 11158+4227 Discov num COU1904 Comp Coord arcsec 2000 11 15 49.68 +42 26 58.1
Date first 1981 Date last 2018 Obs 34
Pa first 197 Pa last 211.6 P.A. Now (θ) 211.6°
Sep first 0.3 Sep last 0.55 Sep. Now (ρ) 0.55"
Mag pri 8.33 Mag sec 9.46 delta mag (ΔM) 1.13 Spectral class F8 (yellow-white)
Pri motion ra -111 Sec motion ra -111
Pri motion dec -004 Sec motion dec -004
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 97857 Constellation Ursa Major SAO 43667 Tycho2 3012-01939-1
Gaia DR2 783699972376844800 HD 97857 GC 15478
 
 
ORBITAL ELEMENTS
 
 
Period (P)228.3y± 27.6 Periastron (T)1972.7y± 1.1 Semi-major axis (a)0.559a± 0.044
Eccentricity (e)0.513± 0.015 Inclination (i)79.1°± 0.3 Longitude of periastron (ω)104°± 6
Node (Ω)20.8°± 0.2 Notes ReferenceBAE2021
Equinox Last observation Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 206.3 0.417
2001 206.7 0.418
2002 207.2 0.418
2003 207.6 0.418
2004 208.1 0.417
2005 208.6 0.417
2006 209.0 0.415
2007 209.5 0.414
2008 209.9 0.412
2009 210.4 0.409
2010 210.9 0.407
2011 211.4 0.404
2012 211.9 0.400
2013 212.4 0.397
2014 212.9 0.393
2015 213.4 0.389
2016 214.0 0.385
2017 214.5 0.381
2018 215.1 0.376
2019 215.6 0.371
2020 216.2 0.366
2021 216.8 0.361
2022 217.5 0.356
2023 218.1 0.350
2024 218.8 0.345
2025 219.4 0.339
2026 220.1 0.334
2027 220.9 0.328
2028 221.6 0.322
2029 222.4 0.316
2030 223.2 0.310


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



 
 


wds11158%2B4227a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic