18097+5024 HU 674 (HD 166820)
18h 09m 40.64s +50° 24' 07.4" P.A. 213.00 sep 0.7 mag 7.68,8.63 Sp A3V dist. 141.04 pc (460.07 l.y.)
| Coord 2000 |
18097+5024 |
|
Discov num |
HU 674 |
|
Comp |
|
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Coord arcsec 2000 |
18 09 40.64 +50 24 07.4 |
|
| Date first |
1904 |
|
Date last |
2018 |
|
Obs |
66 |
|
| Pa first |
279 |
|
Pa last |
213 |
|
P.A. Now (θ) |
213° |
|
| Sep first |
0.5 |
|
Sep last |
0.732 |
|
Sep. Now (ρ) |
0.732" |
|
| Mag pri |
7.68 |
|
Mag sec |
8.63 |
|
delta mag (ΔM) |
0.95 |
|
Spectral class |
A3V (white) |
|
| Pri motion ra |
+007 |
|
Sec motion ra |
+007 |
|
| Pri motion dec |
+007 |
|
Sec motion dec |
+007 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 166820 |
|
Constellation |
Hercules |
|
SAO |
30776 |
|
HIP |
88975 |
|
| Tycho2 |
3532-01029-1 |
|
Gaia DR2 |
2124653942613840000 |
|
HD |
166820 |
|
GC |
24792 |
|
| ADS |
11128 |
|
BD |
BD+50 2531 |
|
Distance |
141.04 |
|
Distance ly |
460.07 |
|
ORBITAL ELEMENTS
| Period (P) | 773.2y | |
Periastron (T) | 2050.5y | |
Semi-major axis (a) | 1.981a | |
| Eccentricity (e) | 0.796 | |
Inclination (i) | 101.7° | |
Longitude of periastron (ω) | 66.9° | |
| Node (Ω) | 203° | |
Notes | | |
Reference | Msn2017e | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
220.4 |
0.745 |
| 2001 |
220.0 |
0.746 |
| 2002 |
219.6 |
0.747 |
| 2003 |
219.2 |
0.748 |
| 2004 |
218.8 |
0.749 |
| 2005 |
218.4 |
0.749 |
| 2006 |
218.0 |
0.750 |
| 2007 |
217.6 |
0.750 |
| 2008 |
217.2 |
0.750 |
| 2009 |
216.8 |
0.750 |
| 2010 |
216.4 |
0.750 |
| 2011 |
216.0 |
0.749 |
| 2012 |
215.6 |
0.749 |
| 2013 |
215.2 |
0.748 |
| 2014 |
214.8 |
0.746 |
| 2015 |
214.4 |
0.745 |
| 2016 |
214.0 |
0.743 |
| 2017 |
213.6 |
0.740 |
| 2018 |
213.2 |
0.738 |
| 2019 |
212.8 |
0.735 |
| 2020 |
212.4 |
0.731 |
| 2021 |
211.9 |
0.728 |
| 2022 |
211.5 |
0.723 |
| 2023 |
211.1 |
0.718 |
| 2024 |
210.6 |
0.713 |
| 2025 |
210.2 |
0.707 |
| 2026 |
209.7 |
0.701 |
| 2027 |
209.3 |
0.694 |
| 2028 |
208.8 |
0.686 |
| 2029 |
208.3 |
0.677 |
| 2030 |
207.8 |
0.668 |
|
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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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