20154+6412 MLR 60 AB
20h 15m 21.50s +64° 11' 55.6" P.A. 173.00 sep 0.2 mag 8.46,8.50 Sp G5 dist. 68.97 pc (224.98 l.y.)
| Coord 2000 |
20154+6412 |
|
Discov num |
MLR 60 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 15 21.50 +64 11 55.6 |
|
| Date first |
1970 |
|
Date last |
2008 |
|
Obs |
24 |
|
| Pa first |
20 |
|
Pa last |
173.2 |
|
P.A. Now (θ) |
11.4° |
|
| Sep first |
0.2 |
|
Sep last |
0.249 |
|
Sep. Now (ρ) |
0.18" |
|
| Mag pri |
8.46 |
|
Mag sec |
8.50 |
|
delta mag (ΔM) |
0.04 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+178 |
|
Sec motion ra |
|
|
| Pri motion dec |
+232 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20154+6412 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
18780 |
20 15 22 +64 11 56 |
MLR 60 AB |
2008 |
24 |
173 |
0.2 |
8.46 |
8.50 |
0.04 |
Y |
<=== |
| Show |
|
|
20 15 22 +64 11 56 |
LDS 5245 AC |
1960 |
1 |
122 |
20.0 |
8.46 |
17.03 |
8.57 |
|
|
| Show |
|
|
20 15 22 +64 11 56 |
SHY 772 AD |
2016 |
4 |
247 |
999.9 |
8.46 |
10.12 |
1.66 |
|
|
Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Draco |
|
SAO |
18780 |
|
HIP |
99832 |
|
Tycho2 |
4240-00516-1 |
|
| Gaia DR2 |
2244572934213430272 |
|
HD |
193215 |
|
BD |
BD+63 1608 |
|
Distance |
68.97 |
|
| Distance ly |
224.98 |
|
ORBITAL ELEMENTS
| Period (P) | 50y | |
Periastron (T) | 1963.9y | |
Semi-major axis (a) | 0.239a | |
| Eccentricity (e) | 0.035 | |
Inclination (i) | 107.5° | |
Longitude of periastron (ω) | 68.2° | |
| Node (Ω) | 176° | |
Notes | n | |
Reference | Doc2012j | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
188.2 |
0.200 |
| 2001 |
185.3 |
0.213 |
| 2002 |
182.8 |
0.224 |
| 2003 |
180.4 |
0.231 |
| 2004 |
178.1 |
0.235 |
| 2005 |
175.9 |
0.236 |
| 2006 |
173.6 |
0.233 |
| 2007 |
171.3 |
0.226 |
| 2008 |
168.8 |
0.216 |
| 2009 |
165.9 |
0.203 |
| 2010 |
162.7 |
0.187 |
| 2011 |
158.8 |
0.169 |
| 2012 |
153.9 |
0.148 |
| 2013 |
147.3 |
0.127 |
| 2014 |
138.0 |
0.105 |
| 2015 |
124.2 |
0.086 |
| 2016 |
104.0 |
0.073 |
| 2017 |
79.0 |
0.070 |
| 2018 |
56.2 |
0.079 |
| 2019 |
39.8 |
0.096 |
| 2020 |
28.8 |
0.117 |
| 2021 |
21.2 |
0.139 |
| 2022 |
15.7 |
0.160 |
| 2023 |
11.4 |
0.180 |
| 2024 |
8.0 |
0.198 |
| 2025 |
5.0 |
0.213 |
| 2026 |
2.5 |
0.225 |
| 2027 |
0.1 |
0.234 |
| 2028 |
357.9 |
0.240 |
| 2029 |
355.8 |
0.242 |
| 2030 |
353.7 |
0.241 |
| 2031 |
351.5 |
0.237 |
| 2032 |
349.2 |
0.229 |
| 2033 |
346.8 |
0.219 |
| 2034 |
344.0 |
0.206 |
| 2035 |
340.9 |
0.190 |
| 2036 |
337.1 |
0.172 |
| 2037 |
332.4 |
0.153 |
| 2038 |
326.4 |
0.133 |
| 2039 |
318.1 |
0.113 |
| 2040 |
306.5 |
0.095 |
| 2041 |
290.2 |
0.081 |
| 2042 |
269.1 |
0.074 |
| 2043 |
247.3 |
0.078 |
| 2044 |
229.4 |
0.090 |
| 2045 |
216.5 |
0.107 |
| 2046 |
207.3 |
0.127 |
| 2047 |
200.7 |
0.147 |
| 2048 |
195.6 |
0.166 |
| 2049 |
191.6 |
0.184 |
| 2050 |
188.2 |
0.200 |
|
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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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