18035+4032 COU 1785 (HD 165311)
18h 03m 31.83s +40° 32' 00.6" P.A. 30.00 sep 0.2 mag 8.70,8.90 Sp F5
Coord 2000 |
18035+4032 |
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Discov num |
COU1785 |
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Comp |
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Coord arcsec 2000 |
18 03 31.83 +40 32 00.6 |
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Date first |
1978 |
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Date last |
2016 |
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Obs |
20 |
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Pa first |
50 |
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Pa last |
30.4 |
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P.A. Now (θ) |
45.9° |
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Sep first |
0.2 |
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Sep last |
0.166 |
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Sep. Now (ρ) |
0.186" |
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Mag pri |
8.70 |
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Mag sec |
8.90 |
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delta mag (ΔM) |
0.2 |
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Spectral class |
F5 (yellow-white) |
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Pri motion ra |
-005 |
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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 165311 |
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Constellation |
Hercules |
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SAO |
47175 |
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Tycho2 |
3106-00845-1 |
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Gaia DR2 |
4611379808736923264 |
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HD |
165311 |
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ORBITAL ELEMENTS
Period (P) | 45.72y | ± 0.5 |
Periastron (T) | 1995y | ± 0.5 |
Semi-major axis (a) | 0.135a | ± 0.002 |
Eccentricity (e) | 0.483 | ± 0.003 |
Inclination (i) | 65.7° | ± 1 |
Longitude of periastron (ω) | 147° | ± 3 |
Node (Ω) | 52.8° | ± 1 |
Notes | n | |
Reference | Doc2008a | |
Equinox | 2000 | |
Last observation | 2005 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
268.9 |
0.065 |
2001 |
282.3 |
0.060 |
2002 |
297.8 |
0.056 |
2003 |
314.3 |
0.056 |
2004 |
329.7 |
0.060 |
2005 |
342.9 |
0.066 |
2006 |
353.5 |
0.074 |
2007 |
1.9 |
0.084 |
2008 |
8.5 |
0.094 |
2009 |
13.8 |
0.104 |
2010 |
18.2 |
0.114 |
2011 |
21.9 |
0.123 |
2012 |
25.0 |
0.133 |
2013 |
27.8 |
0.141 |
2014 |
30.2 |
0.149 |
2015 |
32.4 |
0.157 |
2016 |
34.5 |
0.163 |
2017 |
36.3 |
0.169 |
2018 |
38.1 |
0.174 |
2019 |
39.7 |
0.179 |
2020 |
41.3 |
0.182 |
2021 |
42.9 |
0.184 |
2022 |
44.4 |
0.186 |
2023 |
45.9 |
0.186 |
2024 |
47.4 |
0.186 |
2025 |
48.9 |
0.184 |
2026 |
50.4 |
0.181 |
2027 |
52.1 |
0.176 |
2028 |
53.8 |
0.171 |
2029 |
55.6 |
0.164 |
2030 |
57.7 |
0.155 |
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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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