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 |
|
Discov num |
BU 631 |
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Comp |
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Coord arcsec 2000 |
17 39 57.70 -00 38 21.2 |
|
| Date first |
1878 |
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Date last |
2018 |
|
Obs |
127 |
|
| Pa first |
70 |
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Pa last |
80.8 |
|
P.A. Now (θ) |
74.6° |
|
| Sep first |
0.4 |
|
Sep last |
0.306 |
|
Sep. Now (ρ) |
0.335" |
|
| Mag pri |
7.23 |
|
Mag sec |
7.40 |
|
delta mag (ΔM) |
0.17 |
|
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 |
|
Constellation |
Ophiuchus |
|
SAO |
141795 |
|
HIP |
86463 |
|
| Tycho2 |
5081-02482-1 |
|
HD |
160438 |
|
GC |
23947 |
|
ADS |
10696 |
|
| BD |
BD-00 3338 |
|
Distance |
245.7 |
|
Distance ly |
801.47 |
|
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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