17400-0038 BU 631 (HD 160438)
17h 39m 57.70s -00° 38' 21.2" P.A. 81.00 sep 0.3 mag 7.23,7.40 Sp B9IV dist. 245.7 pc (801.47 l.y.)
Coord 2000 |
17400-0038 |
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Discov num |
BU 631 |
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Comp |
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Coord arcsec 2000 |
17 39 57.70 -00 38 21.2 |
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Date first |
1878 |
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Date last |
2018 |
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Obs |
127 |
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Pa first |
70 |
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Pa last |
80.8 |
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P.A. Now (θ) |
74.6° |
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Sep first |
0.4 |
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Sep last |
0.306 |
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Sep. Now (ρ) |
0.335" |
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Mag pri |
7.23 |
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Mag sec |
7.40 |
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delta mag (ΔM) |
0.17 |
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Spectral class |
B9IV (blue-white) |
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Pri motion ra |
-008 |
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Sec motion ra |
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Pri motion dec |
-016 |
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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 160438 |
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Constellation |
Ophiuchus |
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SAO |
141795 |
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HIP |
86463 |
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Tycho2 |
5081-02482-1 |
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HD |
160438 |
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GC |
23947 |
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ADS |
10696 |
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BD |
BD-00 3338 |
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Distance |
245.7 |
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Distance ly |
801.47 |
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ORBITAL ELEMENTS
Period (P) | 147.5y | |
Periastron (T) | 1978.3y | |
Semi-major axis (a) | 0.217a | |
Eccentricity (e) | 0.78 | |
Inclination (i) | 162.5° | |
Longitude of periastron (ω) | 146° | |
Node (Ω) | 26.8° | |
Notes | n | |
Reference | Hei1996a | |
Equinox | | |
Last observation | | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
94.2 |
0.229 |
2001 |
93.0 |
0.235 |
2002 |
91.8 |
0.241 |
2003 |
90.6 |
0.247 |
2004 |
89.5 |
0.253 |
2005 |
88.5 |
0.259 |
2006 |
87.5 |
0.264 |
2007 |
86.5 |
0.269 |
2008 |
85.6 |
0.275 |
2009 |
84.7 |
0.280 |
2010 |
83.8 |
0.284 |
2011 |
83.0 |
0.289 |
2012 |
82.2 |
0.294 |
2013 |
81.4 |
0.298 |
2014 |
80.6 |
0.302 |
2015 |
79.9 |
0.306 |
2016 |
79.2 |
0.310 |
2017 |
78.5 |
0.314 |
2018 |
77.8 |
0.318 |
2019 |
77.1 |
0.322 |
2020 |
76.5 |
0.325 |
2021 |
75.8 |
0.329 |
2022 |
75.2 |
0.332 |
2023 |
74.6 |
0.335 |
2024 |
74.0 |
0.338 |
2025 |
73.4 |
0.341 |
2026 |
72.8 |
0.344 |
2027 |
72.2 |
0.346 |
2028 |
71.6 |
0.349 |
2029 |
71.1 |
0.352 |
2030 |
70.5 |
0.354 |
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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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