17313+1901 COU 499 (HD 158956)
17h 31m 17.44s +19° 01' 02.8" P.A. 304.00 sep 0.1 mag 8.70,8.70 Sp A5 dist. 446.43 pc (1456.25 l.y.)
| Coord 2000 |
17313+1901 |
|
Discov num |
COU 499 |
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Comp |
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Coord arcsec 2000 |
17 31 17.44 +19 01 02.8 |
|
| Date first |
1970 |
|
Date last |
2021 |
|
Obs |
26 |
|
| Pa first |
90 |
|
Pa last |
304.2 |
|
P.A. Now (θ) |
304.2° |
|
| Sep first |
0.2 |
|
Sep last |
0.097 |
|
Sep. Now (ρ) |
0.097" |
|
| Mag pri |
8.70 |
|
Mag sec |
8.70 |
|
delta mag (ΔM) |
0 |
|
Spectral class |
A5 (white) |
|
| Pri motion ra |
-012 |
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Sec motion ra |
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|
| Pri motion dec |
-028 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 158956 |
|
Constellation |
Hercules |
|
SAO |
102882 |
|
HIP |
85740 |
|
| Tycho2 |
1546-01390-1 |
|
Gaia DR2 |
4553813709233975808 |
|
HD |
158956 |
|
BD |
BD+19 3336 |
|
| Distance |
446.43 |
|
Distance ly |
1456.25 |
|
ORBITAL ELEMENTS
| Period (P) | 316.83y | |
Periastron (T) | 2003.65y | |
Semi-major axis (a) | 0.284a | |
| Eccentricity (e) | 0.5 | |
Inclination (i) | 124.6° | |
Longitude of periastron (ω) | 216.5° | |
| Node (Ω) | 225.1° | |
Notes | | |
Reference | Tok2017c | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
32.0 |
0.136 |
| 2001 |
29.5 |
0.133 |
| 2002 |
26.9 |
0.130 |
| 2003 |
24.2 |
0.126 |
| 2004 |
21.3 |
0.123 |
| 2005 |
18.2 |
0.119 |
| 2006 |
14.9 |
0.115 |
| 2007 |
11.4 |
0.112 |
| 2008 |
7.6 |
0.108 |
| 2009 |
3.7 |
0.105 |
| 2010 |
359.4 |
0.102 |
| 2011 |
354.9 |
0.099 |
| 2012 |
350.2 |
0.096 |
| 2013 |
345.2 |
0.094 |
| 2014 |
340.1 |
0.093 |
| 2015 |
334.8 |
0.092 |
| 2016 |
329.4 |
0.091 |
| 2017 |
324.0 |
0.092 |
| 2018 |
318.7 |
0.092 |
| 2019 |
313.5 |
0.094 |
| 2020 |
308.4 |
0.096 |
| 2021 |
303.6 |
0.098 |
| 2022 |
299.1 |
0.101 |
| 2023 |
294.8 |
0.104 |
| 2024 |
290.8 |
0.108 |
| 2025 |
287.1 |
0.112 |
| 2026 |
283.6 |
0.117 |
| 2027 |
280.5 |
0.121 |
| 2028 |
277.5 |
0.126 |
| 2029 |
274.8 |
0.131 |
| 2030 |
272.2 |
0.136 |
|
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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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