21573+3241 A 1226 (HD 208687)
21h 57m 17.70s +32° 40' 32.4" P.A. 181.00 sep 0.1 mag 9.29,9.90 Sp A3 dist. 1063.83 pc (3470.21 l.y.)
Coord 2000 |
21573+3241 |
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Discov num |
A 1226 |
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Comp |
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Coord arcsec 2000 |
21 57 17.70 +32 40 32.4 |
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Date first |
1905 |
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Date last |
2011 |
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Obs |
24 |
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Pa first |
349 |
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Pa last |
180.9 |
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P.A. Now (θ) |
180.9° |
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Sep first |
0.3 |
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Sep last |
0.103 |
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Sep. Now (ρ) |
0.103" |
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Mag pri |
9.29 |
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Mag sec |
9.90 |
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delta mag (ΔM) |
0.61 |
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Spectral class |
A3 (white) |
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Pri motion ra |
-013 |
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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
Name |
HD 208687 |
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Constellation |
Pegasus |
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SAO |
71873 |
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HIP |
108373 |
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Tycho2 |
2723-01872-1 |
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Gaia DR2 |
1899751450496790912 |
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HD |
208687 |
|
ADS |
15487 |
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BD |
BD+31 4589 |
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Distance |
1063.83 |
|
Distance ly |
3470.21 |
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ORBITAL ELEMENTS
Period (P) | 124.2y | |
Periastron (T) | 1963.49y | |
Semi-major axis (a) | 0.325a | |
Eccentricity (e) | 0.871 | |
Inclination (i) | 105.6° | |
Longitude of periastron (ω) | 281° | |
Node (Ω) | 116.5° | |
Notes | | |
Reference | Sca2019b | |
Equinox | 2000 | |
Last observation | 2017 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
27.6 |
0.145 |
2001 |
25.7 |
0.146 |
2002 |
23.8 |
0.148 |
2003 |
22.0 |
0.149 |
2004 |
20.2 |
0.151 |
2005 |
18.4 |
0.153 |
2006 |
16.7 |
0.155 |
2007 |
15.0 |
0.157 |
2008 |
13.4 |
0.159 |
2009 |
11.8 |
0.161 |
2010 |
10.3 |
0.163 |
2011 |
8.8 |
0.165 |
2012 |
7.3 |
0.167 |
2013 |
5.9 |
0.169 |
2014 |
4.5 |
0.171 |
2015 |
3.1 |
0.174 |
2016 |
1.8 |
0.176 |
2017 |
0.5 |
0.178 |
2018 |
359.2 |
0.180 |
2019 |
358.0 |
0.183 |
2020 |
356.8 |
0.185 |
2021 |
355.6 |
0.187 |
2022 |
354.5 |
0.190 |
2023 |
353.4 |
0.192 |
2024 |
352.3 |
0.194 |
2025 |
351.3 |
0.197 |
2026 |
350.2 |
0.199 |
2027 |
349.2 |
0.201 |
2028 |
348.2 |
0.204 |
2029 |
347.3 |
0.206 |
2030 |
346.3 |
0.208 |
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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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