17563+0259 A 2189 (HD 163471)
17h 56m 16.70s +02° 59' 09.1" P.A. 288.00 sep 0.1 mag 8.50,8.80 Sp A2 dist. 398.41 pc (1299.61 l.y.)
Coord 2000 |
17563+0259 |
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Discov num |
A 2189 |
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Comp |
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Coord arcsec 2000 |
17 56 16.70 +02 59 09.1 |
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Date first |
1910 |
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Date last |
2018 |
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Obs |
29 |
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Pa first |
326 |
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Pa last |
288.3 |
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P.A. Now (θ) |
296.4° |
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Sep first |
0.3 |
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Sep last |
0.134 |
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Sep. Now (ρ) |
0.158" |
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Mag pri |
8.50 |
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Mag sec |
8.80 |
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delta mag (ΔM) |
0.3 |
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Spectral class |
A2 (white) |
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Pri motion ra |
+006 |
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Sec motion ra |
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Pri motion dec |
-012 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 163471 |
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Constellation |
Ophiuchus |
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SAO |
122936 |
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HIP |
87811 |
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Tycho2 |
0421-00446-1 |
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Gaia DR2 |
4469168184529999488 |
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HD |
163471 |
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ADS |
10899 |
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BD |
BD+03 3534 |
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Distance |
398.41 |
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Distance ly |
1299.61 |
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ORBITAL ELEMENTS
Period (P) | 171.73y | ± 6.17 |
Periastron (T) | 1975.08y | ± 0.72 |
Semi-major axis (a) | 0.235a | ± 0.008 |
Eccentricity (e) | 0.517 | ± 0.02 |
Inclination (i) | 71° | ± 1 |
Longitude of periastron (ω) | 328.3° | ± 2 |
Node (Ω) | 150.8° | ± 1 |
Notes | n | |
Reference | Doc2018l | |
Equinox | 2000 | |
Last observation | 2018 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
217.2 |
0.076 |
2001 |
222.8 |
0.076 |
2002 |
228.5 |
0.075 |
2003 |
234.1 |
0.076 |
2004 |
239.7 |
0.077 |
2005 |
245.1 |
0.078 |
2006 |
250.2 |
0.080 |
2007 |
255.0 |
0.083 |
2008 |
259.5 |
0.086 |
2009 |
263.7 |
0.090 |
2010 |
267.5 |
0.094 |
2011 |
271.0 |
0.098 |
2012 |
274.3 |
0.102 |
2013 |
277.2 |
0.107 |
2014 |
279.9 |
0.112 |
2015 |
282.4 |
0.117 |
2016 |
284.7 |
0.122 |
2017 |
286.7 |
0.127 |
2018 |
288.7 |
0.132 |
2019 |
290.4 |
0.137 |
2020 |
292.1 |
0.143 |
2021 |
293.6 |
0.148 |
2022 |
295.1 |
0.153 |
2023 |
296.4 |
0.158 |
2024 |
297.6 |
0.164 |
2025 |
298.8 |
0.169 |
2026 |
299.9 |
0.174 |
2027 |
300.9 |
0.179 |
2028 |
301.9 |
0.184 |
2029 |
302.8 |
0.189 |
2030 |
303.7 |
0.194 |
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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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