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 |
|
Discov num |
COU 612 |
|
Comp |
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Coord arcsec 2000 |
15 39 02.60 +25 44 47.0 |
|
| Date first |
1971 |
|
Date last |
2016 |
|
Obs |
85 |
|
| Pa first |
200 |
|
Pa last |
341.7 |
|
P.A. Now (θ) |
139.7° |
|
| Sep first |
0.2 |
|
Sep last |
0.285 |
|
Sep. Now (ρ) |
0.219" |
|
| Mag pri |
9.15 |
|
Mag sec |
9.04 |
|
delta mag (ΔM) |
0.11 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+026 |
|
Sec motion ra |
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| Pri motion dec |
+003 |
|
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 |
|
Constellation |
Corona Borealis |
|
SAO |
83928 |
|
HIP |
76639 |
|
| Tycho2 |
2036-01176-1 |
|
HD |
139749 |
|
BD |
BD+26 2712 |
|
Distance |
106.04 |
|
| Distance ly |
345.9 |
|
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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