18384+6708 STF 2384 AB
18h 38m 23.66s +67° 07' 35.6" P.A. 307.00 sep 0.4 mag 8.31,8.95 Sp G5 dist. 53.82 pc (175.56 l.y.)
| Coord 2000 |
18384+6708 |
|
Discov num |
STF2384 |
|
Comp |
AB |
|
Coord arcsec 2000 |
18 38 23.66 +67 07 35.6 |
|
| Date first |
1832 |
|
Date last |
2020 |
|
Obs |
102 |
|
| Pa first |
307 |
|
Pa last |
306.9 |
|
P.A. Now (θ) |
304° |
|
| Sep first |
0.8 |
|
Sep last |
0.36 |
|
Sep. Now (ρ) |
0.39" |
|
| Mag pri |
8.31 |
|
Mag sec |
8.95 |
|
delta mag (ΔM) |
0.64 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
-138 |
|
Sec motion ra |
|
|
| Pri motion dec |
+196 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18384+6708 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
17964 |
18 38 24 +67 07 36 |
STF 2384 AB |
2020 |
102 |
307 |
0.4 |
8.31 |
8.95 |
0.64 |
Y |
<=== |
| Show |
HD 173084 |
17964 |
18 38 24 +67 07 36 |
STF 2384 AB,C |
2015 |
8 |
162 |
136.5 |
7.78 |
12.50 |
4.72 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Draco |
|
SAO |
17964 |
|
HIP |
91395 |
|
Tycho2 |
4227-00251-1 |
|
| Gaia DR2 |
2258633214027998976 |
|
HD |
173084 |
|
GC |
25551 |
|
ADS |
11568 |
|
| BD |
BD+67 1087 |
|
Distance |
53.82 |
|
Distance ly |
175.56 |
|
ORBITAL ELEMENTS
| Period (P) | 133.5y | |
Periastron (T) | 1999.5y | |
Semi-major axis (a) | 0.615a | |
| Eccentricity (e) | 0.68 | |
Inclination (i) | 86.5° | |
Longitude of periastron (ω) | 343° | |
| Node (Ω) | 129.2° | |
Notes | n | |
Reference | Hei1996c | |
| Equinox | 2000 | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
128.7 |
0.196 |
| 2001 |
129.9 |
0.203 |
| 2002 |
131.0 |
0.198 |
| 2003 |
132.3 |
0.183 |
| 2004 |
133.8 |
0.163 |
| 2005 |
135.8 |
0.138 |
| 2006 |
138.8 |
0.110 |
| 2007 |
144.0 |
0.081 |
| 2008 |
154.8 |
0.052 |
| 2009 |
186.2 |
0.029 |
| 2010 |
250.5 |
0.030 |
| 2011 |
279.2 |
0.055 |
| 2012 |
289.2 |
0.084 |
| 2013 |
294.0 |
0.113 |
| 2014 |
296.8 |
0.143 |
| 2015 |
298.7 |
0.173 |
| 2016 |
300.0 |
0.202 |
| 2017 |
301.0 |
0.230 |
| 2018 |
301.7 |
0.258 |
| 2019 |
302.4 |
0.286 |
| 2020 |
302.9 |
0.313 |
| 2021 |
303.3 |
0.339 |
| 2022 |
303.7 |
0.365 |
| 2023 |
304.0 |
0.390 |
| 2024 |
304.3 |
0.415 |
| 2025 |
304.5 |
0.439 |
| 2026 |
304.7 |
0.462 |
| 2027 |
304.9 |
0.485 |
| 2028 |
305.1 |
0.507 |
| 2029 |
305.3 |
0.529 |
| 2030 |
305.5 |
0.550 |
|
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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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