17366+0723 A 1156 (HD 159857)
17h 36m 34.63s +07° 22' 31.2" P.A. 347.00 sep 0.2 mag 9.35,8.60 Sp A3 dist. 181.16 pc (590.94 l.y.)
| Coord 2000 |
17366+0723 |
|
Discov num |
A 1156 |
|
Comp |
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Coord arcsec 2000 |
17 36 34.63 +07 22 31.2 |
|
| Date first |
1905 |
|
Date last |
2021 |
|
Obs |
32 |
|
| Pa first |
172 |
|
Pa last |
347.3 |
|
P.A. Now (θ) |
342.9° |
|
| Sep first |
0.3 |
|
Sep last |
0.189 |
|
Sep. Now (ρ) |
0.17" |
|
| Mag pri |
9.35 |
|
Mag sec |
8.60 |
|
delta mag (ΔM) |
0.75 |
|
Spectral class |
A3 (white) |
|
| Pri motion ra |
-005 |
|
Sec motion ra |
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|
| Pri motion dec |
-017 |
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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 159857 |
|
Constellation |
Ophiuchus |
|
SAO |
122561 |
|
HIP |
86174 |
|
| Tycho2 |
0426-01173-1 |
|
Gaia DR2 |
4486917463295231616 |
|
HD |
159857 |
|
ADS |
10659 |
|
| BD |
BD+07 3413 |
|
Distance |
181.16 |
|
Distance ly |
590.94 |
|
ORBITAL ELEMENTS
| Period (P) | 195.22y | |
Periastron (T) | 2000y | |
Semi-major axis (a) | 0.281a | |
| Eccentricity (e) | 0.26 | |
Inclination (i) | 95.5° | |
Longitude of periastron (ω) | 156.8° | |
| Node (Ω) | 168.3° | |
Notes | | |
Reference | Doc2015b | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
350.7 |
0.191 |
| 2001 |
350.3 |
0.196 |
| 2002 |
349.9 |
0.200 |
| 2003 |
349.6 |
0.203 |
| 2004 |
349.3 |
0.206 |
| 2005 |
349.0 |
0.208 |
| 2006 |
348.7 |
0.210 |
| 2007 |
348.4 |
0.211 |
| 2008 |
348.1 |
0.212 |
| 2009 |
347.8 |
0.212 |
| 2010 |
347.5 |
0.212 |
| 2011 |
347.2 |
0.212 |
| 2012 |
346.9 |
0.210 |
| 2013 |
346.6 |
0.209 |
| 2014 |
346.2 |
0.207 |
| 2015 |
345.9 |
0.204 |
| 2016 |
345.6 |
0.201 |
| 2017 |
345.3 |
0.198 |
| 2018 |
344.9 |
0.194 |
| 2019 |
344.5 |
0.190 |
| 2020 |
344.2 |
0.186 |
| 2021 |
343.8 |
0.181 |
| 2022 |
343.3 |
0.176 |
| 2023 |
342.9 |
0.170 |
| 2024 |
342.4 |
0.165 |
| 2025 |
341.9 |
0.159 |
| 2026 |
341.3 |
0.153 |
| 2027 |
340.7 |
0.146 |
| 2028 |
340.1 |
0.140 |
| 2029 |
339.4 |
0.133 |
| 2030 |
338.6 |
0.126 |
|
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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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