15390+2545 COU 612 (HD 139749)
15h 39m 02.60s +25° 44' 47.0" P.A. 342.00 sep 0.3 mag 9.15,9.04 Sp G5 dist. 106.04 pc (345.9 l.y.)
Coord 2000 |
15390+2545 |
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Discov num |
COU 612 |
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Comp |
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Coord arcsec 2000 |
15 39 02.60 +25 44 47.0 |
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Date first |
1971 |
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Date last |
2016 |
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Obs |
85 |
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Pa first |
200 |
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Pa last |
341.7 |
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P.A. Now (θ) |
139.7° |
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Sep first |
0.2 |
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Sep last |
0.285 |
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Sep. Now (ρ) |
0.219" |
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Mag pri |
9.15 |
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Mag sec |
9.04 |
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delta mag (ΔM) |
0.11 |
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Spectral class |
G5 (yellow) |
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Pri motion ra |
+026 |
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Sec motion ra |
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Pri motion dec |
+003 |
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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 139749 |
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Constellation |
Corona Borealis |
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SAO |
83928 |
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HIP |
76639 |
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Tycho2 |
2036-01176-1 |
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HD |
139749 |
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BD |
BD+26 2712 |
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Distance |
106.04 |
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Distance ly |
345.9 |
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ORBITAL ELEMENTS
Period (P) | 63.09y | |
Periastron (T) | 2035.01y | |
Semi-major axis (a) | 0.223a | |
Eccentricity (e) | 0.401 | |
Inclination (i) | 138.8° | |
Longitude of periastron (ω) | 136.1° | |
Node (Ω) | 155.9° | |
Notes | n | |
Reference | Doc2011h | |
Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
201.0 |
0.263 |
2001 |
198.3 |
0.268 |
2002 |
195.6 |
0.272 |
2003 |
193.0 |
0.276 |
2004 |
190.5 |
0.280 |
2005 |
188.0 |
0.283 |
2006 |
185.6 |
0.285 |
2007 |
183.2 |
0.287 |
2008 |
180.8 |
0.289 |
2009 |
178.5 |
0.290 |
2010 |
176.2 |
0.290 |
2011 |
173.8 |
0.289 |
2012 |
171.5 |
0.288 |
2013 |
169.1 |
0.286 |
2014 |
166.7 |
0.283 |
2015 |
164.2 |
0.280 |
2016 |
161.7 |
0.276 |
2017 |
159.1 |
0.270 |
2018 |
156.3 |
0.264 |
2019 |
153.5 |
0.257 |
2020 |
150.4 |
0.249 |
2021 |
147.1 |
0.240 |
2022 |
143.6 |
0.230 |
2023 |
139.7 |
0.219 |
2024 |
135.4 |
0.207 |
2025 |
130.5 |
0.194 |
2026 |
124.9 |
0.180 |
2027 |
118.4 |
0.166 |
2028 |
110.6 |
0.151 |
2029 |
101.1 |
0.137 |
2030 |
89.6 |
0.124 |
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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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