18320+0647 STT 354 (HD 170987)
18h 32m 01.73s +06° 46' 48.4" P.A. 205.00 sep 0.5 mag 7.84,8.91 Sp F5.6V+F5V dist. 89.37 pc (291.52 l.y.)
| Coord 2000 |
18320+0647 |
|
Discov num |
STT 354 |
|
Comp |
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Coord arcsec 2000 |
18 32 01.73 +06 46 48.4 |
|
| Date first |
1843 |
|
Date last |
2021 |
|
Obs |
115 |
|
| Pa first |
150 |
|
Pa last |
204.8 |
|
P.A. Now (θ) |
204.8° |
|
| Sep first |
0.7 |
|
Sep last |
0.501 |
|
Sep. Now (ρ) |
0.501" |
|
| Mag pri |
7.84 |
|
Mag sec |
8.91 |
|
delta mag (ΔM) |
1.07 |
|
Spectral class |
F5.6V+F5V (yellow-white/yellow-white) |
|
| Pri motion ra |
-027 |
|
Sec motion ra |
-027 |
|
| Pri motion dec |
-081 |
|
Sec motion dec |
-081 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 170987 |
|
Constellation |
Ophiuchus |
|
SAO |
123609 |
|
HIP |
90851 |
|
| Tycho2 |
0458-00606-1 |
|
Gaia DR2 |
4285137563278292864 |
|
HD |
170987 |
|
ADS |
11432 |
|
| BD |
BD+06 3829 |
|
Distance |
89.37 |
|
Distance ly |
291.52 |
|
ORBITAL ELEMENTS
| Period (P) | 426y | |
Periastron (T) | 1783.9y | |
Semi-major axis (a) | 0.801a | |
| Eccentricity (e) | 0.504 | |
Inclination (i) | 63.6° | |
Longitude of periastron (ω) | 252° | |
| Node (Ω) | 149.7° | |
Notes | | |
Reference | Zir2013a | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
205.2 |
0.622 |
| 2001 |
205.7 |
0.619 |
| 2002 |
206.3 |
0.616 |
| 2003 |
206.8 |
0.613 |
| 2004 |
207.4 |
0.610 |
| 2005 |
207.9 |
0.607 |
| 2006 |
208.5 |
0.604 |
| 2007 |
209.1 |
0.601 |
| 2008 |
209.7 |
0.598 |
| 2009 |
210.3 |
0.595 |
| 2010 |
210.8 |
0.592 |
| 2011 |
211.4 |
0.590 |
| 2012 |
212.0 |
0.587 |
| 2013 |
212.7 |
0.584 |
| 2014 |
213.3 |
0.581 |
| 2015 |
213.9 |
0.579 |
| 2016 |
214.5 |
0.576 |
| 2017 |
215.1 |
0.573 |
| 2018 |
215.8 |
0.571 |
| 2019 |
216.4 |
0.568 |
| 2020 |
217.1 |
0.566 |
| 2021 |
217.7 |
0.563 |
| 2022 |
218.4 |
0.561 |
| 2023 |
219.0 |
0.558 |
| 2024 |
219.7 |
0.556 |
| 2025 |
220.4 |
0.554 |
| 2026 |
221.1 |
0.551 |
| 2027 |
221.8 |
0.549 |
| 2028 |
222.5 |
0.547 |
| 2029 |
223.2 |
0.545 |
| 2030 |
223.9 |
0.543 |
|
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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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