20274+7245 A 871

 
 
20h 27m 24.67s +72 44' 38.2" P.A. 184.00 sep 0.3 mag 9.40,9.60 Sp F8
 
 
Coord 2000 20274+7245 Discov num A   871 Comp Coord arcsec 2000 20 27 24.67 +72 44 38.2
Date first 1904 Date last 2008 Obs 15
Pa first 95 Pa last 184 P.A. Now (θ) 184°
Sep first 0.3 Sep last 0.325 Sep. Now (ρ) 0.325"
Mag pri 9.40 Mag sec 9.60 delta mag (ΔM) 0.2 Spectral class F8 (yellow-white)
Pri motion ra -003 Sec motion ra
Pri motion dec -006 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Draco Tycho2 4455-00436-1 ADS 13914
 
 
ORBITAL ELEMENTS
 
 
Period (P)149y Periastron (T)2024y Semi-major axis (a)0.316a
Eccentricity (e)0.67 Inclination (i)57° Longitude of periastron (ω)248°
Node (Ω)72.1° Notes ReferenceHei1998
Equinox Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 198.0 0.212
2001 200.2 0.210
2002 202.4 0.209
2003 204.7 0.207
2004 207.0 0.205
2005 209.3 0.203
2006 211.7 0.201
2007 214.1 0.199
2008 216.6 0.197
2009 219.2 0.195
2010 221.8 0.192
2011 224.5 0.189
2012 227.2 0.185
2013 230.1 0.181
2014 233.2 0.177
2015 236.4 0.171
2016 239.8 0.165
2017 243.6 0.158
2018 247.7 0.149
2019 252.5 0.138
2020 258.1 0.126
2021 264.9 0.112
2022 274.0 0.096
2023 286.7 0.080
2024 305.5 0.066
2025 331.7 0.058
2026 359.4 0.062
2027 20.4 0.075
2028 34.4 0.093
2029 43.8 0.112
2030 50.5 0.130


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



 
 


wds20274%2B7245a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic