19180+2012 COU 321 (HD 181025)
19h 17m 57.89s +20° 11' 33.7" P.A. 141.00 sep 0.1 mag 8.92,8.92 Sp A5 dist. 135.32 pc (441.41 l.y.)
Coord 2000 |
19180+2012 |
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Discov num |
COU 321 |
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Comp |
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Coord arcsec 2000 |
19 17 57.89 +20 11 33.7 |
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Date first |
1968 |
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Date last |
2013 |
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Obs |
33 |
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Pa first |
133 |
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Pa last |
140.7 |
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P.A. Now (θ) |
140.7° |
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Sep first |
0.2 |
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Sep last |
0.107 |
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Sep. Now (ρ) |
0.107" |
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Mag pri |
8.92 |
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Mag sec |
8.92 |
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delta mag (ΔM) |
0 |
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Spectral class |
A5 (white) |
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Pri motion ra |
+005 |
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Sec motion ra |
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Pri motion dec |
-026 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 181025 |
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Constellation |
Sagitta |
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SAO |
87042 |
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HIP |
94847 |
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Tycho2 |
1607-00274-1 |
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Gaia DR2 |
4516634578236919040 |
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HD |
181025 |
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BD |
BD+19 3972 |
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Distance |
135.32 |
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Distance ly |
441.41 |
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ORBITAL ELEMENTS
Period (P) | 354.12y | ± 20 |
Periastron (T) | 2349.4y | ± 2 |
Semi-major axis (a) | 0.484a | ± 0.02 |
Eccentricity (e) | 0.776 | ± 0.1 |
Inclination (i) | 101° | ± 2 |
Longitude of periastron (ω) | 188.4° | ± 5 |
Node (Ω) | 142.2° | ± 3 |
Notes | n | |
Reference | Doc2003e | |
Equinox | 2000 | |
Last observation | 1998 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
303.0 |
0.067 |
2001 |
295.2 |
0.055 |
2002 |
283.4 |
0.044 |
2003 |
265.2 |
0.036 |
2004 |
240.1 |
0.033 |
2005 |
215.0 |
0.036 |
2006 |
196.7 |
0.044 |
2007 |
185.0 |
0.055 |
2008 |
177.3 |
0.068 |
2009 |
172.1 |
0.081 |
2010 |
168.3 |
0.094 |
2011 |
165.5 |
0.107 |
2012 |
163.3 |
0.120 |
2013 |
161.5 |
0.133 |
2014 |
160.0 |
0.146 |
2015 |
158.8 |
0.159 |
2016 |
157.7 |
0.172 |
2017 |
156.8 |
0.184 |
2018 |
156.0 |
0.196 |
2019 |
155.3 |
0.208 |
2020 |
154.7 |
0.220 |
2021 |
154.1 |
0.231 |
2022 |
153.6 |
0.243 |
2023 |
153.2 |
0.254 |
2024 |
152.7 |
0.265 |
2025 |
152.3 |
0.276 |
2026 |
152.0 |
0.286 |
2027 |
151.6 |
0.297 |
2028 |
151.3 |
0.307 |
2029 |
151.0 |
0.317 |
2030 |
150.8 |
0.327 |
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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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