20216+1930 COU 327AB

 
 
20h 21m 35.69s +19 29' 40.1" P.A. 246.1 sep 0.17 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
2018
Obs
22
Pa first
72
Pa last
245
P.A. Now (θ)
246.1°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.17"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 20216+1930 COU 327 AB 1968 2018 22 246 0.2 9.10 9.10 0.00 Y <===
Show 20216+1930 COU 327 AB,C 1968 2007 5 131 4.0 8.41 11.97 3.56
Triple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
244.5
Precise sep
0.176
Constellation
Delphinus
SAO
106021
HIP
100397
Tycho2
1639-02397-1
Gaia DR2
71324521728
HD
193797
BD
BD+19 4380
Distance
188.68
Distance ly
615.47
last precise pa
244.5
last precise sep
0.176
 
 
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 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2005
label rho theta
2000 0.039 220.7
2001 0.051 227.2
2002 0.064 231.2
2003 0.076 233.9
2004 0.087 235.9
2005 0.099 237.4
2006 0.109 238.6
2007 0.119 239.6
2008 0.129 240.5
2009 0.138 241.2
2010 0.146 241.9
2011 0.153 242.5
2012 0.159 243.0
2013 0.165 243.5
2014 0.169 244.0
2015 0.172 244.4
2016 0.174 244.8
2017 0.175 245.3
2018 0.174 245.7
2019 0.171 246.1
2020 0.167 246.6
2021 0.160 247.1
2022 0.151 247.6
2023 0.138 248.2
2024 0.122 249.0
2025 0.102 250.0
2026 0.076 251.7
2027 0.045 255.4
2028 0.009 288.9
2029 0.032 59.6
2030 0.062 66.0

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






wds20216%2B1930c.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
20216+1930 COU 327 AB 2005 20 238 0.1 9.10 9.10 F8 NOD 202135.69+192940.1
20216+1930 COU 327 AB 2007 21 170 0.1 9.10 9.10 F8 NOD 202135.69+192940.1

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