18355+2336 STT 359 (HD 171745)
18h 35m 30.40s +23° 36' 19.9" P.A. 5.00 sep 0.8 mag 6.35,6.62 Sp G9III+ dist. 144.3 pc (470.71 l.y.)
Coord 2000 |
18355+2336 |
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Discov num |
STT 359 |
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Comp |
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Coord arcsec 2000 |
18 35 30.40 +23 36 19.9 |
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Date first |
1843 |
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Date last |
2021 |
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Obs |
247 |
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Pa first |
0 |
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Pa last |
5.2 |
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P.A. Now (θ) |
3.2° |
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Sep first |
0.9 |
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Sep last |
0.79 |
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Sep. Now (ρ) |
0.755" |
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Mag pri |
6.35 |
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Mag sec |
6.62 |
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delta mag (ΔM) |
0.27 |
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Spectral class |
G9III+ (yellow) |
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Pri motion ra |
+005 |
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Sec motion ra |
+005 |
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Pri motion dec |
+003 |
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Sec motion dec |
+003 |
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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 171745 |
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Constellation |
Hercules |
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SAO |
86224 |
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HIP |
91139 |
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Tycho2 |
2107-00474-1 |
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HD |
171745 |
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HR |
6980 |
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GC |
25407 |
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ADS |
11479 |
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BD |
BD+23 3385 |
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Distance |
144.3 |
|
Distance ly |
470.71 |
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ORBITAL ELEMENTS
Period (P) | 219.3y | ± 8.8 |
Periastron (T) | 1929.081y | ± 0.54 |
Semi-major axis (a) | 0.425a | ± 0.014 |
Eccentricity (e) | 0.8393 | ± 0.0066 |
Inclination (i) | 119.9° | ± 2 |
Longitude of periastron (ω) | 197.7° | ± 2.1 |
Node (Ω) | 10° | ± 1.2 |
Notes | n | |
Reference | Sca2009a | |
Equinox | 2000 | |
Last observation | 2006 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
6.6 |
0.711 |
2001 |
6.4 |
0.714 |
2002 |
6.3 |
0.717 |
2003 |
6.1 |
0.720 |
2004 |
5.9 |
0.723 |
2005 |
5.8 |
0.726 |
2006 |
5.6 |
0.728 |
2007 |
5.5 |
0.731 |
2008 |
5.3 |
0.733 |
2009 |
5.2 |
0.735 |
2010 |
5.0 |
0.737 |
2011 |
4.9 |
0.739 |
2012 |
4.7 |
0.741 |
2013 |
4.6 |
0.743 |
2014 |
4.5 |
0.745 |
2015 |
4.3 |
0.746 |
2016 |
4.2 |
0.748 |
2017 |
4.0 |
0.749 |
2018 |
3.9 |
0.750 |
2019 |
3.7 |
0.751 |
2020 |
3.6 |
0.752 |
2021 |
3.5 |
0.753 |
2022 |
3.3 |
0.754 |
2023 |
3.2 |
0.755 |
2024 |
3.0 |
0.756 |
2025 |
2.9 |
0.756 |
2026 |
2.7 |
0.757 |
2027 |
2.6 |
0.757 |
2028 |
2.5 |
0.757 |
2029 |
2.3 |
0.757 |
2030 |
2.2 |
0.758 |
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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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