18339+5144 ZUC 16 (BY Dra)
18h 33m 55.77s +51° 43' 08.9" P.A. 47.00 sep 17.0 mag 8.45,15.10 Sp K4V+K7.5 dist. 16.35 pc (53.33 l.y.)
| Coord 2000 |
18339+5144 |
|
Discov num |
ZUC 16 |
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Comp |
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Coord arcsec 2000 |
18 33 55.77 +51 43 08.9 |
|
| Date first |
1988 |
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Date last |
2016 |
|
Obs |
8 |
|
| Pa first |
44 |
|
Pa last |
46.6 |
|
P.A. Now (θ) |
46.6° |
|
| Sep first |
16.3 |
|
Sep last |
16.96 |
|
Sep. Now (ρ) |
16.96" |
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| Mag pri |
8.45 |
|
Mag sec |
15.10 |
|
delta mag (ΔM) |
6.65 |
|
Spectral class |
K4V+K7.5 (yellow-orange/yellow-orange) |
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| Pri motion ra |
+186 |
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Sec motion ra |
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| Pri motion dec |
-323 |
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Sec motion dec |
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| Notes |
N
(See Notes) |
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Nature of this double is uncertain.
OTHER CATALOGS AND DESIGNATIONS
| Var name |
BY Dra |
|
Constellation |
Draco |
|
SAO |
31048 |
|
HIP |
91009 |
|
| Tycho2 |
3539-02623-1 |
|
HD |
234677 |
|
GC |
25394 |
|
GL |
Gl 719 |
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| BD |
BD+51 2402 |
|
Distance |
16.35 |
|
Distance ly |
53.33 |
|
SUSPECTED ORBITAL ELEMENTS
| Identifier | 18339+5144 |
| coord_arcsec_2000 | 183355.60+514311.7 |
| Period (P) | 143.402712h | ± 0.00011 |
Periastron (T) | 53999.2144m (2006.722y) | ± 0.0021 |
Semi-major axis (a) | 4.4472m | ± 0.0009 |
| Eccentricity (e) | 0.30014 | ± 0.00062 |
Inclination (i) | 154.41° | ± 0.29 |
Longitude of periastron (ω) | 230.33° | ± 0.17 |
| Node (Ω) | 152.3° | ± 0.1 |
Notes | n | |
Reference | Hel2012 | |
| Equinox | | |
Last observation | 2007 | |
Grade | 8 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
214.5 |
0.003 |
| 2001 |
164.2 |
0.005 |
| 2002 |
133.9 |
0.005 |
| 2003 |
108.1 |
0.005 |
| 2004 |
80.4 |
0.005 |
| 2005 |
46.2 |
0.004 |
| 2006 |
359.9 |
0.004 |
| 2007 |
289.6 |
0.003 |
| 2008 |
205.0 |
0.003 |
| 2009 |
159.3 |
0.005 |
| 2010 |
130.2 |
0.005 |
| 2011 |
104.4 |
0.005 |
| 2012 |
76.1 |
0.005 |
| 2013 |
40.5 |
0.004 |
| 2014 |
351.9 |
0.004 |
| 2015 |
276.7 |
0.003 |
| 2016 |
196.5 |
0.004 |
| 2017 |
154.7 |
0.005 |
| 2018 |
126.5 |
0.005 |
| 2019 |
100.7 |
0.005 |
| 2020 |
71.7 |
0.005 |
| 2021 |
34.6 |
0.004 |
| 2022 |
343.4 |
0.004 |
| 2023 |
263.5 |
0.003 |
| 2024 |
188.8 |
0.004 |
| 2025 |
150.3 |
0.005 |
| 2026 |
122.9 |
0.006 |
| 2027 |
96.9 |
0.005 |
| 2028 |
67.0 |
0.005 |
| 2029 |
28.5 |
0.004 |
| 2030 |
334.3 |
0.003 |
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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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