17457+1743 STF 2205 (HD 161585)
17h 45m 41.03s +17° 43' 00.7" P.A. 21.00 sep 0.8 mag 9.37,9.59 Sp K0.2V+K2V
Coord 2000 |
17457+1743 |
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Discov num |
STF2205 |
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Comp |
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Coord arcsec 2000 |
17 45 41.03 +17 43 00.7 |
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Date first |
1830 |
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Date last |
2021 |
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Obs |
199 |
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Pa first |
291 |
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Pa last |
20.7 |
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P.A. Now (θ) |
20.7° |
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Sep first |
2.5 |
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Sep last |
0.793 |
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Sep. Now (ρ) |
0.793" |
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Mag pri |
9.37 |
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Mag sec |
9.59 |
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delta mag (ΔM) |
0.22 |
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Spectral class |
K0.2V+K2V (yellow-orange/yellow-orange) |
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Pri motion ra |
-025 |
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Sec motion ra |
-025 |
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Pri motion dec |
+074 |
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Sec motion dec |
+074 |
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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 161585 |
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Constellation |
Hercules |
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SAO |
103085 |
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Tycho2 |
1556-00743-1 |
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Gaia DR2 |
4551173541294403328 |
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HD |
161585 |
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GC |
24106 |
|
ADS |
10769 |
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ORBITAL ELEMENTS
Period (P) | 600.4431y | ± 248.9038 |
Periastron (T) | 2030.0111y | ± 2.6119 |
Semi-major axis (a) | 2.58966a | ± 0.53544 |
Eccentricity (e) | 0.81961 | ± 0.06253 |
Inclination (i) | 54.896° | ± 5.241 |
Longitude of periastron (ω) | 78.875° | ± 5.199 |
Node (Ω) | 19.079° | ± 15.989 |
Notes | n | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2015 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
352.0 |
1.221 |
2001 |
352.9 |
1.204 |
2002 |
353.9 |
1.186 |
2003 |
354.8 |
1.168 |
2004 |
355.8 |
1.149 |
2005 |
356.8 |
1.129 |
2006 |
357.9 |
1.109 |
2007 |
359.0 |
1.088 |
2008 |
0.1 |
1.067 |
2009 |
1.3 |
1.044 |
2010 |
2.5 |
1.021 |
2011 |
3.9 |
0.997 |
2012 |
5.2 |
0.971 |
2013 |
6.7 |
0.945 |
2014 |
8.2 |
0.917 |
2015 |
9.8 |
0.888 |
2016 |
11.6 |
0.858 |
2017 |
13.4 |
0.826 |
2018 |
15.4 |
0.792 |
2019 |
17.7 |
0.756 |
2020 |
20.1 |
0.718 |
2021 |
22.8 |
0.678 |
2022 |
25.9 |
0.636 |
2023 |
29.4 |
0.591 |
2024 |
33.5 |
0.544 |
2025 |
38.4 |
0.495 |
2026 |
44.5 |
0.444 |
2027 |
52.0 |
0.394 |
2028 |
61.8 |
0.346 |
2029 |
74.3 |
0.306 |
2030 |
90.0 |
0.279 |
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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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