18015-1014 BU 47 (HD 164434)
18h 01m 30.85s -10° 14' 00.9" P.A. 76.00 sep 0.6 mag 8.74,9.59 Sp G0
| Coord 2000 |
18015-1014 |
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Discov num |
BU 47 |
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Comp |
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Coord arcsec 2000 |
18 01 30.85 -10 14 00.9 |
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| Date first |
1871 |
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Date last |
2014 |
|
Obs |
27 |
|
| Pa first |
270 |
|
Pa last |
76.3 |
|
P.A. Now (θ) |
76.3° |
|
| Sep first |
1.3 |
|
Sep last |
0.642 |
|
Sep. Now (ρ) |
0.642" |
|
| Mag pri |
8.74 |
|
Mag sec |
9.59 |
|
delta mag (ΔM) |
0.85 |
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Spectral class |
G0 (yellow) |
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| Pri motion ra |
+046 |
|
Sec motion ra |
+046 |
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| Pri motion dec |
-036 |
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Sec motion dec |
-036 |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 164434 |
|
Constellation |
Serpens |
|
Tycho2 |
5679-00367-1 |
|
Gaia DR2 |
4152221721459524736 |
|
| HD |
164434 |
|
ADS |
10977 |
|
ORBITAL ELEMENTS
| Period (P) | 403.9y | |
Periastron (T) | 2013y | |
Semi-major axis (a) | 1.209a | |
| Eccentricity (e) | 0.478 | |
Inclination (i) | 54° | |
Longitude of periastron (ω) | 339.8° | |
| Node (Ω) | 85.3° | |
Notes | | |
Reference | Hrt2013c | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
44.2 |
0.499 |
| 2001 |
46.9 |
0.507 |
| 2002 |
49.5 |
0.515 |
| 2003 |
52.0 |
0.523 |
| 2004 |
54.4 |
0.532 |
| 2005 |
56.7 |
0.541 |
| 2006 |
59.0 |
0.549 |
| 2007 |
61.2 |
0.558 |
| 2008 |
63.3 |
0.567 |
| 2009 |
65.4 |
0.575 |
| 2010 |
67.4 |
0.583 |
| 2011 |
69.3 |
0.591 |
| 2012 |
71.2 |
0.599 |
| 2013 |
73.1 |
0.606 |
| 2014 |
74.9 |
0.613 |
| 2015 |
76.7 |
0.619 |
| 2016 |
78.4 |
0.625 |
| 2017 |
80.1 |
0.630 |
| 2018 |
81.8 |
0.635 |
| 2019 |
83.5 |
0.640 |
| 2020 |
85.1 |
0.643 |
| 2021 |
86.7 |
0.647 |
| 2022 |
88.3 |
0.650 |
| 2023 |
89.9 |
0.652 |
| 2024 |
91.5 |
0.654 |
| 2025 |
93.0 |
0.655 |
| 2026 |
94.6 |
0.656 |
| 2027 |
96.2 |
0.657 |
| 2028 |
97.7 |
0.657 |
| 2029 |
99.3 |
0.656 |
| 2030 |
100.9 |
0.656 |
|
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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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