17161+2316 COU 315
17h 16m 07.60s +23° 15' 36.9" P.A. 117.00 sep 0.1 mag 9.30,10.10 Sp K0+K2 dist. 250 pc (815.5 l.y.)
Coord 2000 |
17161+2316 |
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Discov num |
COU 315 |
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Comp |
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Coord arcsec 2000 |
17 16 07.60 +23 15 36.9 |
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Date first |
1968 |
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Date last |
2014 |
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Obs |
24 |
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Pa first |
163 |
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Pa last |
117.2 |
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P.A. Now (θ) |
117.2° |
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Sep first |
0.2 |
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Sep last |
0.1 |
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Sep. Now (ρ) |
0.1" |
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Mag pri |
9.30 |
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Mag sec |
10.10 |
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delta mag (ΔM) |
0.8 |
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Spectral class |
K0+K2 (yellow-orange/yellow-orange) |
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Pri motion ra |
-003 |
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Sec motion ra |
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Pri motion dec |
+014 |
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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
Constellation |
Hercules |
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HIP |
84468 |
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Tycho2 |
2061-00874-1 |
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Gaia DR2 |
4568569808114360448 |
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BD |
BD+23 3071 |
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Distance |
250 |
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Distance ly |
815.5 |
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ORBITAL ELEMENTS
Period (P) | 90.5y | ± 1 |
Periastron (T) | 2012.83y | ± 0.05 |
Semi-major axis (a) | 0.506a | ± 0.005 |
Eccentricity (e) | 0.975 | ± 0.004 |
Inclination (i) | 100.4° | ± 4 |
Longitude of periastron (ω) | 89.3° | ± 15 |
Node (Ω) | 103.4° | ± 4 |
Notes | n | |
Reference | Doc2010h | |
Equinox | 2000 | |
Last observation | 2007 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
151.6 |
0.151 |
2001 |
149.8 |
0.149 |
2002 |
147.9 |
0.146 |
2003 |
146.0 |
0.143 |
2004 |
143.9 |
0.140 |
2005 |
141.8 |
0.136 |
2006 |
139.5 |
0.132 |
2007 |
137.0 |
0.126 |
2008 |
134.4 |
0.120 |
2009 |
131.3 |
0.113 |
2010 |
138.1 |
0.129 |
2011 |
123.5 |
0.090 |
2012 |
117.0 |
0.068 |
2013 |
280.5 |
0.033 |
2014 |
268.0 |
0.080 |
2015 |
262.9 |
0.099 |
2016 |
259.2 |
0.112 |
2017 |
154.0 |
0.154 |
2018 |
253.7 |
0.130 |
2019 |
251.4 |
0.136 |
2020 |
249.3 |
0.142 |
2021 |
247.3 |
0.146 |
2022 |
245.5 |
0.150 |
2023 |
243.7 |
0.154 |
2024 |
242.0 |
0.157 |
2025 |
240.4 |
0.160 |
2026 |
238.8 |
0.163 |
2027 |
237.3 |
0.165 |
2028 |
235.8 |
0.167 |
2029 |
234.4 |
0.169 |
2030 |
232.9 |
0.170 |
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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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