17156-1018 BU 957 (HD 156023)
17h 15m 34.66s -10° 17' 50.9" P.A. 56.00 sep 0.1 mag 7.51,9.69 Sp F5V dist. 108.11 pc (352.65 l.y.)
Coord 2000 |
17156-1018 |
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Discov num |
BU 957 |
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Comp |
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Coord arcsec 2000 |
17 15 34.66 -10 17 50.9 |
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Date first |
1880 |
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Date last |
2021 |
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Obs |
52 |
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Pa first |
24 |
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Pa last |
56 |
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P.A. Now (θ) |
44.3° |
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Sep first |
0.6 |
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Sep last |
0.077 |
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Sep. Now (ρ) |
0.099" |
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Mag pri |
7.51 |
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Mag sec |
9.69 |
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delta mag (ΔM) |
2.18 |
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Spectral class |
F5V (yellow-white) |
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Pri motion ra |
-009 |
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Sec motion ra |
-009 |
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Pri motion dec |
+022 |
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Sec motion dec |
+022 |
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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 156023 |
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Constellation |
Ophiuchus |
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SAO |
160405 |
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HIP |
84423 |
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Tycho2 |
5649-00247-1 |
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Gaia DR2 |
4143224834422302336 |
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HD |
156023 |
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ADS |
10421 |
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BD |
BD-10 4462 |
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Distance |
108.11 |
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Distance ly |
352.65 |
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ORBITAL ELEMENTS
Period (P) | 91.1y | ± 2.9 |
Periastron (T) | 2030.2y | ± 1.8 |
Semi-major axis (a) | 0.287a | ± 0.013 |
Eccentricity (e) | 0.57 | ± 0.048 |
Inclination (i) | 101.1° | ± 1.1 |
Longitude of periastron (ω) | 28.8° | ± 4.2 |
Node (Ω) | 25° | ± 1.2 |
Notes | n | |
Reference | Tok2020e | |
Equinox | | |
Last observation | | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
192.0 |
0.271 |
2001 |
191.2 |
0.259 |
2002 |
190.4 |
0.247 |
2003 |
189.6 |
0.235 |
2004 |
188.6 |
0.222 |
2005 |
187.5 |
0.209 |
2006 |
186.2 |
0.196 |
2007 |
184.7 |
0.182 |
2008 |
183.1 |
0.168 |
2009 |
181.1 |
0.154 |
2010 |
178.7 |
0.139 |
2011 |
175.7 |
0.125 |
2012 |
171.9 |
0.110 |
2013 |
167.1 |
0.096 |
2014 |
160.5 |
0.082 |
2015 |
151.6 |
0.070 |
2016 |
139.1 |
0.060 |
2017 |
122.5 |
0.053 |
2018 |
103.1 |
0.051 |
2019 |
84.4 |
0.055 |
2020 |
69.4 |
0.063 |
2021 |
58.4 |
0.074 |
2022 |
50.4 |
0.086 |
2023 |
44.3 |
0.099 |
2024 |
39.6 |
0.110 |
2025 |
35.8 |
0.121 |
2026 |
32.5 |
0.128 |
2027 |
29.5 |
0.132 |
2028 |
26.5 |
0.132 |
2029 |
23.4 |
0.125 |
2030 |
19.8 |
0.112 |
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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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