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 |
|
Discov num |
STT 359 |
|
Comp |
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|
Coord arcsec 2000 |
18 35 30.40 +23 36 19.9 |
|
| Date first |
1843 |
|
Date last |
2021 |
|
Obs |
247 |
|
| Pa first |
0 |
|
Pa last |
5.2 |
|
P.A. Now (θ) |
3.2° |
|
| Sep first |
0.9 |
|
Sep last |
0.79 |
|
Sep. Now (ρ) |
0.755" |
|
| Mag pri |
6.35 |
|
Mag sec |
6.62 |
|
delta mag (ΔM) |
0.27 |
|
Spectral class |
G9III+ (yellow) |
|
| Pri motion ra |
+005 |
|
Sec motion ra |
+005 |
|
| Pri motion dec |
+003 |
|
Sec motion dec |
+003 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 171745 |
|
Constellation |
Hercules |
|
SAO |
86224 |
|
HIP |
91139 |
|
| Tycho2 |
2107-00474-1 |
|
HD |
171745 |
|
HR |
6980 |
|
GC |
25407 |
|
| ADS |
11479 |
|
BD |
BD+23 3385 |
|
Distance |
144.3 |
|
Distance ly |
470.71 |
|
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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