20012-3835 HDO 294 (HD 189386)
20h 01m 12.74s -38° 35' 12.7" P.A. 33.00 sep 1.3 mag 8.08,9.11 Sp F3V dist. 68.49 pc (223.41 l.y.)
| Coord 2000 |
20012-3835 |
|
Discov num |
HDO 294 |
|
Comp |
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|
Coord arcsec 2000 |
20 01 12.74 -38 35 12.7 |
|
| Date first |
1897 |
|
Date last |
2019 |
|
Obs |
63 |
|
| Pa first |
120 |
|
Pa last |
33.2 |
|
P.A. Now (θ) |
33.2° |
|
| Sep first |
1.5 |
|
Sep last |
1.26 |
|
Sep. Now (ρ) |
1.26" |
|
| Mag pri |
8.08 |
|
Mag sec |
9.11 |
|
delta mag (ΔM) |
1.03 |
|
Spectral class |
F3V (yellow-white) |
|
| Pri motion ra |
+018 |
|
Sec motion ra |
+018 |
|
| Pri motion dec |
-070 |
|
Sec motion dec |
-070 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 189386 |
|
Constellation |
Sagittarius |
|
SAO |
211734 |
|
HIP |
98556 |
|
| Tycho2 |
7947-00530-1 |
|
Gaia DR2 |
6690907208575405056 |
|
HD |
189386 |
|
GC |
27717 |
|
| CD |
CD-3813809 |
|
CP |
CP-38 7919 |
|
Distance |
68.49 |
|
Distance ly |
223.41 |
|
ORBITAL ELEMENTS
| Period (P) | 4484.5y | |
Periastron (T) | 1922.73y | |
Semi-major axis (a) | 4.916a | |
| Eccentricity (e) | 0.9474 | |
Inclination (i) | 40.86° | |
Longitude of periastron (ω) | 137.62° | |
| Node (Ω) | 116.65° | |
Notes | n | |
Reference | Dom1978 | |
| Equinox | 1900 | |
Last observation | 1974 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
30.7 |
1.173 |
| 2001 |
31.0 |
1.184 |
| 2002 |
31.4 |
1.195 |
| 2003 |
31.7 |
1.206 |
| 2004 |
32.0 |
1.217 |
| 2005 |
32.3 |
1.228 |
| 2006 |
32.6 |
1.239 |
| 2007 |
32.9 |
1.250 |
| 2008 |
33.2 |
1.261 |
| 2009 |
33.5 |
1.271 |
| 2010 |
33.8 |
1.282 |
| 2011 |
34.1 |
1.293 |
| 2012 |
34.4 |
1.304 |
| 2013 |
34.7 |
1.314 |
| 2014 |
34.9 |
1.325 |
| 2015 |
35.2 |
1.336 |
| 2016 |
35.5 |
1.346 |
| 2017 |
35.7 |
1.357 |
| 2018 |
36.0 |
1.367 |
| 2019 |
36.2 |
1.378 |
| 2020 |
36.5 |
1.388 |
| 2021 |
36.7 |
1.399 |
| 2022 |
36.9 |
1.409 |
| 2023 |
37.2 |
1.419 |
| 2024 |
37.4 |
1.430 |
| 2025 |
37.6 |
1.440 |
| 2026 |
37.9 |
1.450 |
| 2027 |
38.1 |
1.460 |
| 2028 |
38.3 |
1.471 |
| 2029 |
38.5 |
1.481 |
| 2030 |
38.7 |
1.491 |
|
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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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