20216+1930 COU 327 AB

 
 
20h 21m 35.69s +19 29' 40.1" P.A. 245.00 sep 0.2 mag 9.10,9.10 Sp F8 dist. 188.68 pc (615.47 l.y.)
 
 
Coord 2000 20216+1930 Discov num COU 327 Comp AB Coord arcsec 2000 20 21 35.69 +19 29 40.1
Date first 1968 Date last 2019 Obs 24
Pa first 72 Pa last 245.1 P.A. Now (θ) 248.2°
Sep first 0.2 Sep last 0.177 Sep. Now (ρ) 0.138"
Mag pri 9.10 Mag sec 9.10 delta mag (ΔM) 0 Spectral class F8 (yellow-white)
Pri motion ra +009 Sec motion ra
Pri motion dec +001 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
20216+1930 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 106021 20 21 36 +19 29 40 COU 327 AB 2019 24 245 0.2 9.10 9.10 0.00 Y <===
Show HD 193797 106021 20 21 36 +19 29 40 COU 327 AB,C 2011 7 132 4.1 8.41 11.97 3.56
Triple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Delphinus SAO 106021 HIP 100397 Tycho2 1639-02397-1
Gaia DR2 1816309371324521728 HD 193797 BD BD+19 4380 Distance 188.68
Distance ly 615.47
 
 
ORBITAL ELEMENTS
 
 
Period (P)42.46y± 1 Periastron (T)1986.6y± 0.1 Semi-major axis (a)0.147a± 0.002
Eccentricity (e)0.577± 0.003 Inclination (i)85°± 0.5 Longitude of periastron (ω)303°± 1
Node (Ω)68°± 0.5 Notesn ReferenceDoc2008a
Equinox2000 Last observation2005 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 220.7 0.039
2001 227.2 0.051
2002 231.2 0.064
2003 233.9 0.076
2004 235.9 0.087
2005 237.4 0.099
2006 238.6 0.109
2007 239.6 0.119
2008 240.5 0.129
2009 241.2 0.138
2010 241.9 0.146
2011 242.5 0.153
2012 243.0 0.159
2013 243.5 0.165
2014 244.0 0.169
2015 244.4 0.172
2016 244.8 0.174
2017 245.3 0.175
2018 245.7 0.174
2019 246.1 0.171
2020 246.6 0.167
2021 247.1 0.160
2022 247.6 0.151
2023 248.2 0.138
2024 249.0 0.122
2025 250.0 0.102
2026 251.7 0.076
2027 255.4 0.045
2028 288.9 0.009
2029 59.6 0.032
2030 66.0 0.062


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



 
 


wds20216%2B1930c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic