20274+7245 A   871

 
 
20h 27m 24.67s +72 44' 38.2" P.A. 252.5 sep 0.14 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)
252.5°
Sep first
0.3
Sep last
0.3
Sep. Now (ρ)
0.14"
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
 
 
Precise pa
184
Precise sep
0.325
Constellation
Draco
SAO
9776
Tycho2
4455-00436-1
ADS
13914
last precise pa
184
last precise sep
0.325
 
 
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° Note Grade5(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.212 198.0
2001 0.210 200.2
2002 0.209 202.4
2003 0.207 204.7
2004 0.205 207.0
2005 0.203 209.3
2006 0.201 211.7
2007 0.199 214.1
2008 0.197 216.6
2009 0.195 219.2
2010 0.192 221.8
2011 0.189 224.5
2012 0.185 227.2
2013 0.181 230.1
2014 0.177 233.2
2015 0.171 236.4
2016 0.165 239.8
2017 0.158 243.6
2018 0.149 247.7
2019 0.138 252.5
2020 0.126 258.1
2021 0.112 264.9
2022 0.096 274.0
2023 0.080 286.7
2024 0.066 305.5
2025 0.058 331.7
2026 0.062 359.4
2027 0.075 20.4
2028 0.093 34.4
2029 0.112 43.8
2030 0.130 50.5

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






wds20274%2B7245a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20274+7245 A 871 1997 13 196 0.3 9.40 9.60 F8 O 202724.67+724438.2
20274+7245 A 871 2007 14 183 0.3 9.40 9.60 F8 O 202724.67+724438.2
20274+7245 A 871 2008 15 184 0.3 9.40 9.60 F8 O 202724.67+724438.2

If you need more information about this double, apply for a data request form to the WDS.