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 |
|
Discov num |
COU2542 |
|
Comp |
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Coord arcsec 2000 |
20 52 57.26 +42 58 25.7 |
|
| Date first |
1988 |
|
Date last |
2014 |
|
Obs |
11 |
|
| Pa first |
88 |
|
Pa last |
198.5 |
|
P.A. Now (θ) |
198.5° |
|
| Sep first |
0.4 |
|
Sep last |
0.109 |
|
Sep. Now (ρ) |
0.109" |
|
| Mag pri |
10.46 |
|
Mag sec |
12.03 |
|
delta mag (ΔM) |
1.57 |
|
Spectral class |
K2 (yellow-orange) |
|
| Pri motion ra |
+094 |
|
Sec motion ra |
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|
| Pri motion dec |
+137 |
|
Sec motion dec |
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| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Cygnus |
|
HIP |
103067 |
|
Tycho2 |
3175-00219-1 |
|
Gaia DR2 |
2066014238730126080 |
|
| BD |
BD+42 3895 |
|
Distance |
116.28 |
|
Distance ly |
379.31 |
|
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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