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 |
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Date first |
1968 |
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Date last |
2019 |
|
Obs |
24 |
|
Pa first |
72 |
|
Pa last |
245.1 |
|
P.A. Now (θ) |
248.2° |
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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 |
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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 |
|
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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 |
Notes | n | |
Reference | Doc2008a | |
Equinox | 2000 | |
Last observation | 2005 | |
Grade | 3 | (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 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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