15329+3122 COU 610 (The CrB)
15h 32m 55.78s +31° 21' 32.9" P.A. 198.00 sep 0.8 mag 4.27,6.29 Sp B6Vnne dist. 115.07 pc (375.36 l.y.)
Coord 2000 |
15329+3122 |
|
Discov num |
COU 610 |
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Comp |
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Coord arcsec 2000 |
15 32 55.78 +31 21 32.9 |
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Date first |
1971 |
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Date last |
2016 |
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Obs |
103 |
|
Pa first |
203 |
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Pa last |
197.8 |
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P.A. Now (θ) |
197.8° |
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Sep first |
0.5 |
|
Sep last |
0.844 |
|
Sep. Now (ρ) |
0.844" |
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Mag pri |
4.27 |
|
Mag sec |
6.29 |
|
delta mag (ΔM) |
2.02 |
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Spectral class |
B6Vnne (blue-white) |
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Pri motion ra |
-020 |
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Sec motion ra |
-020 |
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Pri motion dec |
-006 |
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Sec motion dec |
-006 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
The CrB |
|
Var name |
7134/5 |
|
Constellation |
Corona Borealis |
|
SAO |
64769 |
|
HIP |
76127 |
|
Tycho2 |
2564-01629-1 |
|
Gaia DR2 |
1274286186493145728 |
|
HD |
138749 |
|
HR |
5778 |
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GC |
20908 |
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BD |
BD+31 2750 |
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Bayer |
Theta Coronae Borealis |
|
Bayer name |
The CrB |
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Flamsteed |
4 Coronae Borealis |
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Flamsteed name |
4 CrB |
|
FK5 |
576 |
|
Distance |
115.07 |
|
Distance ly |
375.36 |
|
Bayer greek |
θ CrB |
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ORBITAL ELEMENTS
Period (P) | 361.1y | ± 76.8 |
Periastron (T) | 1943y | ± 0.7 |
Semi-major axis (a) | 0.826a | ± 0.118 |
Eccentricity (e) | 0.78 | ± 0.054 |
Inclination (i) | 100.5° | ± 3.2 |
Longitude of periastron (ω) | 66.5° | ± 8.8 |
Node (Ω) | 26.9° | ± 2.5 |
Notes | n | |
Reference | Ksr2021 | |
Equinox | | |
Last observation | 2016 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
199.9 |
0.790 |
2001 |
199.8 |
0.794 |
2002 |
199.6 |
0.797 |
2003 |
199.5 |
0.801 |
2004 |
199.4 |
0.804 |
2005 |
199.3 |
0.807 |
2006 |
199.2 |
0.810 |
2007 |
199.0 |
0.813 |
2008 |
198.9 |
0.816 |
2009 |
198.8 |
0.818 |
2010 |
198.7 |
0.821 |
2011 |
198.6 |
0.823 |
2012 |
198.5 |
0.825 |
2013 |
198.3 |
0.828 |
2014 |
198.2 |
0.830 |
2015 |
198.1 |
0.832 |
2016 |
198.0 |
0.833 |
2017 |
197.9 |
0.835 |
2018 |
197.8 |
0.837 |
2019 |
197.7 |
0.838 |
2020 |
197.6 |
0.839 |
2021 |
197.5 |
0.841 |
2022 |
197.3 |
0.842 |
2023 |
197.2 |
0.843 |
2024 |
197.1 |
0.844 |
2025 |
197.0 |
0.845 |
2026 |
196.9 |
0.846 |
2027 |
196.8 |
0.846 |
2028 |
196.7 |
0.847 |
2029 |
196.6 |
0.848 |
2030 |
196.5 |
0.848 |
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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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