18471+5523 SIG 5
18h 47m 03.42s +55° 22' 43.3" P.A. 126.00 sep 0.2 mag 12.55,12.81 Sp M7+M7.5
Coord 2000 |
18471+5523 |
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Discov num |
SIG 5 |
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Comp |
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Coord arcsec 2000 |
18 47 03.42 +55 22 43.3 |
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Date first |
2003 |
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Date last |
2013 |
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Obs |
17 |
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Pa first |
91 |
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Pa last |
125.7 |
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P.A. Now (θ) |
125.7° |
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Sep first |
0.1 |
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Sep last |
0.238 |
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Sep. Now (ρ) |
0.238" |
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Mag pri |
12.55 |
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Mag sec |
12.81 |
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delta mag (ΔM) |
0.26 |
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Spectral class |
M7+M7.5 (red/red) |
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Pri motion ra |
+132 |
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Sec motion ra |
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Pri motion dec |
-068 |
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Sec motion dec |
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Notes |
N
O
K
(See Notes, Orbital solution, K-band or other infrared magnitudes) |
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Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Draco |
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Gaia DR2 |
2147054361726599552 |
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ORBITAL ELEMENTS
Period (P) | 34y | ± 5 |
Periastron (T) | 61700d (2027.805y) | ± 2000 |
Semi-major axis (a) | 186m | ± 18 |
Eccentricity (e) | 0.31 | ± 0.09 |
Inclination (i) | 75.9° | ± 0.7 |
Longitude of periastron (ω) | 158° | ± 31 |
Node (Ω) | 127.9° | ± 0.5 |
Notes | n | |
Reference | Dup2017 | |
Equinox | | |
Last observation | 2013 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
0.6 |
0.054 |
2001 |
36.8 |
0.046 |
2002 |
70.6 |
0.057 |
2003 |
89.7 |
0.079 |
2004 |
100.2 |
0.103 |
2005 |
106.6 |
0.128 |
2006 |
111.0 |
0.151 |
2007 |
114.3 |
0.172 |
2008 |
116.9 |
0.190 |
2009 |
119.0 |
0.206 |
2010 |
120.9 |
0.219 |
2011 |
122.6 |
0.229 |
2012 |
124.2 |
0.235 |
2013 |
125.7 |
0.238 |
2014 |
127.2 |
0.238 |
2015 |
128.7 |
0.233 |
2016 |
130.3 |
0.225 |
2017 |
132.1 |
0.213 |
2018 |
134.1 |
0.197 |
2019 |
136.5 |
0.177 |
2020 |
139.7 |
0.152 |
2021 |
144.2 |
0.124 |
2022 |
151.5 |
0.093 |
2023 |
166.4 |
0.061 |
2024 |
205.5 |
0.038 |
2025 |
261.2 |
0.047 |
2026 |
285.9 |
0.075 |
2027 |
296.8 |
0.103 |
2028 |
303.4 |
0.123 |
2029 |
308.6 |
0.131 |
2030 |
313.6 |
0.128 |
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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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