20057-3743 HDS 2865 (HD 190289)
20h 05m 41.20s -37° 42' 53.2" P.A. 185.00 sep 0.1 mag 8.53,9.11 Sp F3V dist. 149.03 pc (486.14 l.y.)
| Coord 2000 |
20057-3743 |
|
Discov num |
HDS2865 |
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Comp |
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Coord arcsec 2000 |
20 05 41.20 -37 42 53.2 |
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| Date first |
1991 |
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Date last |
2021 |
|
Obs |
10 |
|
| Pa first |
51 |
|
Pa last |
184.9 |
|
P.A. Now (θ) |
184.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.136 |
|
Sep. Now (ρ) |
0.136" |
|
| Mag pri |
8.53 |
|
Mag sec |
9.11 |
|
delta mag (ΔM) |
0.58 |
|
Spectral class |
F3V (yellow-white) |
|
| Pri motion ra |
+017 |
|
Sec motion ra |
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|
| Pri motion dec |
-007 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 190289 |
|
Constellation |
Sagittarius |
|
SAO |
211799 |
|
HIP |
98979 |
|
| Tycho2 |
7947-03226-1 |
|
Gaia DR2 |
6696917383945134080 |
|
HD |
190289 |
|
CD |
CD-3813850 |
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| CP |
CP-38 7940 |
|
Distance |
149.03 |
|
Distance ly |
486.14 |
|
ORBITAL ELEMENTS
| Period (P) | 50y | |
Periastron (T) | 2018.71y | ± 0.56 |
Semi-major axis (a) | 0.1778a | ± 0.0043 |
| Eccentricity (e) | 0.328 | ± 0.04 |
Inclination (i) | 131.5° | ± 4.2 |
Longitude of periastron (ω) | 131.7° | ± 6.6 |
| Node (Ω) | 4.2° | ± 3.7 |
Notes | | |
Reference | Tok2016e | |
| Equinox | 2000 | |
Last observation | | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
20.1 |
0.216 |
| 2001 |
17.1 |
0.216 |
| 2002 |
14.0 |
0.214 |
| 2003 |
10.9 |
0.212 |
| 2004 |
7.6 |
0.208 |
| 2005 |
4.3 |
0.203 |
| 2006 |
0.7 |
0.197 |
| 2007 |
356.9 |
0.189 |
| 2008 |
352.6 |
0.179 |
| 2009 |
347.9 |
0.168 |
| 2010 |
342.5 |
0.156 |
| 2011 |
336.1 |
0.142 |
| 2012 |
328.3 |
0.128 |
| 2013 |
318.4 |
0.113 |
| 2014 |
305.8 |
0.100 |
| 2015 |
289.7 |
0.089 |
| 2016 |
270.5 |
0.084 |
| 2017 |
250.3 |
0.085 |
| 2018 |
232.0 |
0.092 |
| 2019 |
216.8 |
0.102 |
| 2020 |
204.4 |
0.113 |
| 2021 |
194.1 |
0.122 |
| 2022 |
185.2 |
0.130 |
| 2023 |
177.0 |
0.134 |
| 2024 |
169.3 |
0.137 |
| 2025 |
161.8 |
0.138 |
| 2026 |
154.3 |
0.138 |
| 2027 |
146.7 |
0.137 |
| 2028 |
139.0 |
0.135 |
| 2029 |
131.1 |
0.134 |
| 2030 |
123.2 |
0.133 |
|
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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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