20530+4258 COU 2542
20h 52m 57.26s +42° 58' 25.7" P.A. 199.00 sep 0.1 mag 10.46,12.03 Sp K2 dist. 116.28 pc (379.31 l.y.)
Coord 2000 |
20530+4258 |
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Discov num |
COU2542 |
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Comp |
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Coord arcsec 2000 |
20 52 57.26 +42 58 25.7 |
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Date first |
1988 |
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Date last |
2014 |
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Obs |
11 |
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Pa first |
88 |
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Pa last |
198.5 |
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P.A. Now (θ) |
198.5° |
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Sep first |
0.4 |
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Sep last |
0.109 |
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Sep. Now (ρ) |
0.109" |
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Mag pri |
10.46 |
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Mag sec |
12.03 |
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delta mag (ΔM) |
1.57 |
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Spectral class |
K2 (yellow-orange) |
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Pri motion ra |
+094 |
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Sec motion ra |
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Pri motion dec |
+137 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Cygnus |
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HIP |
103067 |
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Tycho2 |
3175-00219-1 |
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Gaia DR2 |
2066014238730126080 |
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BD |
BD+42 3895 |
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Distance |
116.28 |
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Distance ly |
379.31 |
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ORBITAL ELEMENTS
Period (P) | 202.1y | ± 34.4 |
Periastron (T) | 2023.9y | ± 2.6 |
Semi-major axis (a) | 0.477a | ± 0.04 |
Eccentricity (e) | 0.374 | ± 0.037 |
Inclination (i) | 76.2° | ± 0.3 |
Longitude of periastron (ω) | 136.3° | ± 11.5 |
Node (Ω) | 76.5° | ± 0.5 |
Notes | | |
Reference | BAE2021 | |
Equinox | | |
Last observation | | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
94.5 |
0.244 |
2001 |
96.1 |
0.228 |
2002 |
97.9 |
0.212 |
2003 |
100.1 |
0.196 |
2004 |
102.6 |
0.179 |
2005 |
105.7 |
0.163 |
2006 |
109.4 |
0.147 |
2007 |
114.1 |
0.131 |
2008 |
120.0 |
0.116 |
2009 |
127.5 |
0.103 |
2010 |
137.1 |
0.091 |
2011 |
149.0 |
0.083 |
2012 |
163.0 |
0.078 |
2013 |
177.8 |
0.078 |
2014 |
191.6 |
0.083 |
2015 |
203.3 |
0.092 |
2016 |
212.7 |
0.104 |
2017 |
220.0 |
0.118 |
2018 |
225.7 |
0.132 |
2019 |
230.3 |
0.148 |
2020 |
234.0 |
0.163 |
2021 |
237.1 |
0.179 |
2022 |
239.7 |
0.194 |
2023 |
241.9 |
0.209 |
2024 |
243.8 |
0.223 |
2025 |
245.5 |
0.236 |
2026 |
247.1 |
0.249 |
2027 |
248.4 |
0.261 |
2028 |
249.7 |
0.272 |
2029 |
250.9 |
0.282 |
2030 |
252.0 |
0.292 |
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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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