17443-7213 HDO 275 (HD 159964)
17h 44m 19.81s -72° 13' 15.4" P.A. 63.00 sep 0.7 mag 6.85,8.11 Sp F7IV+F5V dist. 43.4 pc (141.57 l.y.)
| Coord 2000 |
17443-7213 |
|
Discov num |
HDO 275 |
|
Comp |
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Coord arcsec 2000 |
17 44 19.81 -72 13 15.4 |
|
| Date first |
1897 |
|
Date last |
2019 |
|
Obs |
35 |
|
| Pa first |
155 |
|
Pa last |
62.8 |
|
P.A. Now (θ) |
58.1° |
|
| Sep first |
0.9 |
|
Sep last |
0.697 |
|
Sep. Now (ρ) |
0.762" |
|
| Mag pri |
6.85 |
|
Mag sec |
8.11 |
|
delta mag (ΔM) |
1.26 |
|
Spectral class |
F7IV+F5V (yellow-white/yellow-white) |
|
| Pri motion ra |
+005 |
|
Sec motion ra |
+005 |
|
| Pri motion dec |
+109 |
|
Sec motion dec |
+109 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 159964 |
|
Constellation |
Apus |
|
SAO |
257525 |
|
HIP |
86815 |
|
| Tycho2 |
9297-00161-1 |
|
HD |
159964 |
|
HR |
6565 |
|
GC |
23971 |
|
| CP |
CP-72 2086 |
|
Distance |
43.4 |
|
Distance ly |
141.57 |
|
ORBITAL ELEMENTS
| Period (P) | 98.6y | |
Periastron (T) | 1986.76y | |
Semi-major axis (a) | 0.629a | |
| Eccentricity (e) | 0.319 | |
Inclination (i) | 150.1° | |
Longitude of periastron (ω) | 58.6° | |
| Node (Ω) | 266.3° | |
Notes | | |
Reference | Hrt2010a | |
| Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
120.8 |
0.517 |
| 2001 |
116.5 |
0.535 |
| 2002 |
112.5 |
0.553 |
| 2003 |
108.7 |
0.571 |
| 2004 |
105.2 |
0.587 |
| 2005 |
101.9 |
0.604 |
| 2006 |
98.7 |
0.619 |
| 2007 |
95.7 |
0.634 |
| 2008 |
92.8 |
0.648 |
| 2009 |
90.0 |
0.661 |
| 2010 |
87.3 |
0.673 |
| 2011 |
84.7 |
0.684 |
| 2012 |
82.3 |
0.695 |
| 2013 |
79.8 |
0.705 |
| 2014 |
77.5 |
0.714 |
| 2015 |
75.2 |
0.722 |
| 2016 |
72.9 |
0.730 |
| 2017 |
70.7 |
0.736 |
| 2018 |
68.5 |
0.742 |
| 2019 |
66.4 |
0.748 |
| 2020 |
64.3 |
0.752 |
| 2021 |
62.2 |
0.756 |
| 2022 |
60.1 |
0.759 |
| 2023 |
58.1 |
0.762 |
| 2024 |
56.0 |
0.764 |
| 2025 |
54.0 |
0.766 |
| 2026 |
52.0 |
0.767 |
| 2027 |
50.0 |
0.767 |
| 2028 |
48.0 |
0.767 |
| 2029 |
45.9 |
0.767 |
| 2030 |
43.9 |
0.766 |
|
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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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