18211+7244 LAB 5 Aa,Ab
18h 21m 02.38s +72° 43' 58.2" P.A. 220.00 sep 0.1 mag 3.57,5.70 Sp F7V dist. 8.06 pc (26.29 l.y.)
| Coord 2000 |
18211+7244 |
|
Discov num |
LAB 5 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
18 21 02.38 +72 43 58.2 |
|
| Date first |
1973 |
|
Date last |
2010 |
|
Obs |
62 |
|
| Pa first |
241 |
|
Pa last |
219.6 |
|
P.A. Now (θ) |
219.6° |
|
| Sep first |
0.1 |
|
Sep last |
0.138 |
|
Sep. Now (ρ) |
0.138" |
|
| Mag pri |
3.57 |
|
Mag sec |
5.70 |
|
delta mag (ΔM) |
2.13 |
|
Spectral class |
F7V (yellow-white) |
|
| Pri motion ra |
+531 |
|
Sec motion ra |
|
|
| Pri motion dec |
-350 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
18211+7244 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
9087 |
18 21 02 +72 43 58 |
LAB 5 Aa,Ab |
2010 |
62 |
220 |
0.1 |
3.57 |
5.70 |
2.13 |
Y |
<=== |
| Show |
Chi Dra |
9087 |
18 21 02 +72 43 58 |
BUP 182 AB |
2008 |
6 |
357 |
177.8 |
3.57 |
12.10 |
8.53 |
|
|
| Show |
|
|
18 21 02 +72 46 54 |
BUP 182 BC |
2015 |
8 |
303 |
9.1 |
12.10 |
14.50 |
2.40 |
|
|
Quadruple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Var name |
NSV10749 Dra |
|
Constellation |
Draco |
|
SAO |
9087 |
|
HIP |
89937 |
|
| Tycho2 |
4437-01491-1 |
|
HD |
170153 |
|
HR |
6927 |
|
GC |
25122 |
|
| GL |
Gl 713A |
|
BD |
BD+72 839 |
|
Bayer |
Chi Draconis |
|
Bayer name |
Chi Dra |
|
| Flamsteed |
44 Draconis |
|
Flamsteed name |
44 Dra |
|
FK5 |
695 |
|
Distance |
8.06 |
|
| Distance ly |
26.29 |
|
Bayer greek |
χ Dra |
|
ORBITAL ELEMENTS
| Period (P) | 280.528d | ± 0.02228 |
Periastron (T) | 46004.68m (1984.834y) | ± 0.949 |
Semi-major axis (a) | 0.1244a | ± 0.0011 |
| Eccentricity (e) | 0.428 | ± 0.012 |
Inclination (i) | 74.42° | ± 0.58 |
Longitude of periastron (ω) | 119.3° | ± 1.1 |
| Node (Ω) | 230.3° | ± 0.51 |
Notes | n | |
Reference | CIA2010 | |
| Equinox | | |
Last observation | 2009 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000-01-01 |
225.9 |
0.141 |
| 2001-01-01 |
45.9 |
0.075 |
| 2002-01-01 |
155.7 |
0.046 |
| 2003-01-01 |
219.5 |
0.138 |
| 2004-01-01 |
277.3 |
0.028 |
| 2005-01-01 |
95.2 |
0.054 |
| 2006-01-01 |
211.7 |
0.116 |
| 2007-01-01 |
235.7 |
0.104 |
| 2008-01-01 |
66.7 |
0.082 |
| 2009-01-01 |
198.6 |
0.083 |
| 2010-01-01 |
227.3 |
0.138 |
| 2011-01-01 |
50.1 |
0.084 |
| 2012-01-01 |
167.3 |
0.050 |
| 2013-01-01 |
220.9 |
0.140 |
| 2014-01-01 |
333.3 |
0.020 |
| 2015-01-01 |
105.5 |
0.049 |
| 2016-01-01 |
213.6 |
0.122 |
| 2017-01-01 |
238.5 |
0.091 |
| 2018-01-01 |
70.9 |
0.077 |
| 2019-01-01 |
202.2 |
0.090 |
| 2020-01-01 |
228.7 |
0.134 |
| 2021-01-01 |
53.7 |
0.088 |
| 2022-01-01 |
176.8 |
0.056 |
| 2023-01-01 |
222.3 |
0.142 |
| 2024-01-01 |
17.7 |
0.033 |
| 2025-01-01 |
117.8 |
0.045 |
| 2026-01-01 |
215.3 |
0.127 |
| 2027-01-01 |
242.3 |
0.076 |
| 2028-01-01 |
75.8 |
0.071 |
| 2029-01-01 |
205.2 |
0.098 |
| 2030-01-01 |
230.3 |
0.129 |
|
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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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