20274+7245 A 871
20h 27m 24.67s +72° 44' 38.2" P.A. 184.00 sep 0.3 mag 9.40,9.60 Sp F8
| Coord 2000 |
20274+7245 |
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Discov num |
A 871 |
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Comp |
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Coord arcsec 2000 |
20 27 24.67 +72 44 38.2 |
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| Date first |
1904 |
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Date last |
2008 |
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Obs |
15 |
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| Pa first |
95 |
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Pa last |
184 |
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P.A. Now (θ) |
184° |
|
| Sep first |
0.3 |
|
Sep last |
0.325 |
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Sep. Now (ρ) |
0.325" |
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| Mag pri |
9.40 |
|
Mag sec |
9.60 |
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delta mag (ΔM) |
0.2 |
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Spectral class |
F8 (yellow-white) |
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| Pri motion ra |
-003 |
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Sec motion ra |
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| Pri motion dec |
-006 |
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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 |
Draco |
|
Tycho2 |
4455-00436-1 |
|
ADS |
13914 |
|
ORBITAL ELEMENTS
| Period (P) | 149y | |
Periastron (T) | 2024y | |
Semi-major axis (a) | 0.316a | |
| Eccentricity (e) | 0.67 | |
Inclination (i) | 57° | |
Longitude of periastron (ω) | 248° | |
| Node (Ω) | 72.1° | |
Notes | | |
Reference | Hei1998 | |
| Equinox | | |
Last observation | | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
198.0 |
0.212 |
| 2001 |
200.2 |
0.210 |
| 2002 |
202.4 |
0.209 |
| 2003 |
204.7 |
0.207 |
| 2004 |
207.0 |
0.205 |
| 2005 |
209.3 |
0.203 |
| 2006 |
211.7 |
0.201 |
| 2007 |
214.1 |
0.199 |
| 2008 |
216.6 |
0.197 |
| 2009 |
219.2 |
0.195 |
| 2010 |
221.8 |
0.192 |
| 2011 |
224.5 |
0.189 |
| 2012 |
227.2 |
0.185 |
| 2013 |
230.1 |
0.181 |
| 2014 |
233.2 |
0.177 |
| 2015 |
236.4 |
0.171 |
| 2016 |
239.8 |
0.165 |
| 2017 |
243.6 |
0.158 |
| 2018 |
247.7 |
0.149 |
| 2019 |
252.5 |
0.138 |
| 2020 |
258.1 |
0.126 |
| 2021 |
264.9 |
0.112 |
| 2022 |
274.0 |
0.096 |
| 2023 |
286.7 |
0.080 |
| 2024 |
305.5 |
0.066 |
| 2025 |
331.7 |
0.058 |
| 2026 |
359.4 |
0.062 |
| 2027 |
20.4 |
0.075 |
| 2028 |
34.4 |
0.093 |
| 2029 |
43.8 |
0.112 |
| 2030 |
50.5 |
0.130 |
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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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