16564+6502 STF 2118 AB (20 Dra)
16h 56m 25.32s +65° 02' 20.6" P.A. 65.00 sep 0.9 mag 7.07,7.30 Sp F2IV dist. 69.93 pc (228.11 l.y.)
| Coord 2000 |
16564+6502 |
|
Discov num |
STF2118 |
|
Comp |
AB |
|
Coord arcsec 2000 |
16 56 25.32 +65 02 20.6 |
|
| Date first |
1830 |
|
Date last |
2018 |
|
Obs |
288 |
|
| Pa first |
63 |
|
Pa last |
64.5 |
|
P.A. Now (θ) |
64.6° |
|
| Sep first |
0.6 |
|
Sep last |
0.892 |
|
Sep. Now (ρ) |
0.899" |
|
| Mag pri |
7.07 |
|
Mag sec |
7.30 |
|
delta mag (ΔM) |
0.23 |
|
Spectral class |
F2IV (yellow-white) |
|
| Pri motion ra |
-033 |
|
Sec motion ra |
-033 |
|
| Pri motion dec |
+034 |
|
Sec motion dec |
+034 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
16564+6502 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
20 Dra |
17285 |
16 56 25 +65 02 21 |
STF 2118 AB |
2018 |
288 |
65 |
0.9 |
7.07 |
7.30 |
0.23 |
Y |
<=== |
| Show |
|
17285 |
16 56 25 +65 02 21 |
D 30 AC |
2003 |
6 |
337 |
374.7 |
7.07 |
4.94 |
2.13 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
20 Dra |
|
Var name |
NSV8081 Dra |
|
Constellation |
Draco |
|
SAO |
17285 |
|
| HIP |
82898 |
|
Tycho2 |
4197-01771-1 |
|
Gaia DR2 |
1635371027735576064 |
|
HD |
153697 |
|
| HR |
6319 |
|
GC |
22881 |
|
ADS |
10279 |
|
BD |
BD+65 1159 |
|
| Flamsteed |
20 Draconis |
|
Flamsteed name |
20 Dra |
|
Distance |
69.93 |
|
Distance ly |
228.11 |
|
ORBITAL ELEMENTS
| Period (P) | 321.3131y | ± 91.6945 |
Periastron (T) | 2076.9847y | ± 28.8265 |
Semi-major axis (a) | 1.05927a | ± 0.16728 |
| Eccentricity (e) | 0.23973 | ± 0.1142 |
Inclination (i) | 96.216° | ± 0.814 |
Longitude of periastron (ω) | 112.091° | ± 44.706 |
| Node (Ω) | 67.426° | ± 1.009 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
67.5 |
1.102 |
| 2001 |
67.4 |
1.098 |
| 2002 |
67.3 |
1.093 |
| 2003 |
67.2 |
1.088 |
| 2004 |
67.1 |
1.082 |
| 2005 |
67.0 |
1.076 |
| 2006 |
66.9 |
1.069 |
| 2007 |
66.8 |
1.063 |
| 2008 |
66.6 |
1.055 |
| 2009 |
66.5 |
1.048 |
| 2010 |
66.4 |
1.040 |
| 2011 |
66.3 |
1.031 |
| 2012 |
66.1 |
1.023 |
| 2013 |
66.0 |
1.014 |
| 2014 |
65.9 |
1.004 |
| 2015 |
65.8 |
0.994 |
| 2016 |
65.6 |
0.983 |
| 2017 |
65.5 |
0.973 |
| 2018 |
65.3 |
0.961 |
| 2019 |
65.2 |
0.950 |
| 2020 |
65.1 |
0.938 |
| 2021 |
64.9 |
0.925 |
| 2022 |
64.7 |
0.912 |
| 2023 |
64.6 |
0.899 |
| 2024 |
64.4 |
0.885 |
| 2025 |
64.2 |
0.871 |
| 2026 |
64.1 |
0.857 |
| 2027 |
63.9 |
0.842 |
| 2028 |
63.7 |
0.826 |
| 2029 |
63.5 |
0.810 |
| 2030 |
63.3 |
0.794 |
|
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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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