20231+2052 A 288 (HD 194113)
20h 23m 08.98s +20° 51' 51.1" P.A. 296.00 sep 0.2 mag 8.72,8.98 Sp F2 dist. 251.89 pc (821.67 l.y.)
| Coord 2000 |
20231+2052 |
|
Discov num |
A 288 |
|
Comp |
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Coord arcsec 2000 |
20 23 08.98 +20 51 51.1 |
|
| Date first |
1901 |
|
Date last |
2012 |
|
Obs |
42 |
|
| Pa first |
352 |
|
Pa last |
295.6 |
|
P.A. Now (θ) |
311.5° |
|
| Sep first |
0.3 |
|
Sep last |
0.196 |
|
Sep. Now (ρ) |
0.232" |
|
| Mag pri |
8.72 |
|
Mag sec |
8.98 |
|
delta mag (ΔM) |
0.26 |
|
Spectral class |
F2 (yellow-white) |
|
| Pri motion ra |
+012 |
|
Sec motion ra |
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| Pri motion dec |
+005 |
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Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 194113 |
|
Constellation |
Delphinus |
|
SAO |
88610 |
|
HIP |
100536 |
|
| Tycho2 |
1643-02278-1 |
|
HD |
194113 |
|
ADS |
13777 |
|
BD |
BD+20 4541 |
|
| Distance |
251.89 |
|
Distance ly |
821.67 |
|
ORBITAL ELEMENTS
| Period (P) | 163.2y | |
Periastron (T) | 1979.2y | |
Semi-major axis (a) | 0.206a | |
| Eccentricity (e) | 0.533 | |
Inclination (i) | 30° | |
Longitude of periastron (ω) | 138.6° | |
| Node (Ω) | 24.5° | |
Notes | n | |
Reference | Doc1994d | |
| Equinox | | |
Last observation | 1991 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
269.0 |
0.158 |
| 2001 |
271.7 |
0.162 |
| 2002 |
274.3 |
0.165 |
| 2003 |
276.7 |
0.168 |
| 2004 |
279.1 |
0.172 |
| 2005 |
281.4 |
0.175 |
| 2006 |
283.6 |
0.179 |
| 2007 |
285.7 |
0.182 |
| 2008 |
287.7 |
0.185 |
| 2009 |
289.7 |
0.189 |
| 2010 |
291.6 |
0.192 |
| 2011 |
293.4 |
0.195 |
| 2012 |
295.2 |
0.199 |
| 2013 |
296.9 |
0.202 |
| 2014 |
298.6 |
0.205 |
| 2015 |
300.2 |
0.208 |
| 2016 |
301.7 |
0.211 |
| 2017 |
303.2 |
0.214 |
| 2018 |
304.7 |
0.217 |
| 2019 |
306.1 |
0.220 |
| 2020 |
307.5 |
0.223 |
| 2021 |
308.9 |
0.226 |
| 2022 |
310.2 |
0.229 |
| 2023 |
311.5 |
0.232 |
| 2024 |
312.8 |
0.235 |
| 2025 |
314.0 |
0.237 |
| 2026 |
315.2 |
0.240 |
| 2027 |
316.4 |
0.243 |
| 2028 |
317.5 |
0.245 |
| 2029 |
318.7 |
0.248 |
| 2030 |
319.8 |
0.250 |
|
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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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