15427+2618 STF 1967 (Gam CrB)
15h 42m 44.57s +26° 17' 44.3" P.A. 110.00 sep 0.5 mag 4.04,5.60 Sp B9V+A3V dist. 44.78 pc (146.07 l.y.)
Coord 2000 |
15427+2618 |
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Discov num |
STF1967 |
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Comp |
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Coord arcsec 2000 |
15 42 44.57 +26 17 44.3 |
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Date first |
1826 |
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Date last |
2015 |
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Obs |
491 |
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Pa first |
111 |
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Pa last |
110.1 |
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P.A. Now (θ) |
306.6° |
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Sep first |
0.7 |
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Sep last |
0.476 |
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Sep. Now (ρ) |
0.11" |
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Mag pri |
4.04 |
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Mag sec |
5.60 |
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delta mag (ΔM) |
1.56 |
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Spectral class |
B9V+A3V (blue-white/white) |
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Pri motion ra |
-107 |
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Sec motion ra |
-107 |
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Pri motion dec |
+048 |
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Sec motion dec |
+048 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
Gam CrB |
|
Constellation |
Corona Borealis |
|
SAO |
83958 |
|
HIP |
76952 |
|
Tycho2 |
2036-01674-1 |
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Gaia DR2 |
1223128521793513984 |
|
HD |
140436 |
|
HR |
5849 |
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GC |
21130 |
|
ADS |
9757 |
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BD |
BD+26 2722 |
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Bayer |
Gamma Coronae Borealis |
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Bayer name |
Gam CrB |
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Flamsteed |
8 Coronae Borealis |
|
Flamsteed name |
8 CrB |
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Distance |
44.78 |
|
Distance ly |
146.07 |
|
Bayer greek |
γ CrB |
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ORBITAL ELEMENTS
Period (P) | 91.2y | ± 0.4 |
Periastron (T) | 1931.6y | ± 0.3 |
Semi-major axis (a) | 0.729a | ± 0.006 |
Eccentricity (e) | 0.48 | ± 0.01 |
Inclination (i) | 94.45° | ± 0.07 |
Longitude of periastron (ω) | 103.8° | ± 0.6 |
Node (Ω) | 111.75° | ± 0.09 |
Notes | n | |
Reference | DRs2012 | |
Equinox | | |
Last observation | 2011 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
114.8 |
0.721 |
2001 |
114.6 |
0.726 |
2002 |
114.3 |
0.728 |
2003 |
114.0 |
0.729 |
2004 |
113.8 |
0.727 |
2005 |
113.5 |
0.722 |
2006 |
113.2 |
0.715 |
2007 |
112.9 |
0.704 |
2008 |
112.6 |
0.690 |
2009 |
112.3 |
0.673 |
2010 |
112.0 |
0.651 |
2011 |
111.6 |
0.626 |
2012 |
111.3 |
0.595 |
2013 |
110.8 |
0.560 |
2014 |
110.3 |
0.519 |
2015 |
109.8 |
0.472 |
2016 |
109.0 |
0.419 |
2017 |
108.1 |
0.359 |
2018 |
106.7 |
0.293 |
2019 |
104.6 |
0.222 |
2020 |
100.1 |
0.145 |
2021 |
85.3 |
0.067 |
2022 |
342.8 |
0.038 |
2023 |
306.6 |
0.110 |
2024 |
299.7 |
0.188 |
2025 |
296.8 |
0.261 |
2026 |
295.1 |
0.326 |
2027 |
294.0 |
0.382 |
2028 |
293.1 |
0.430 |
2029 |
292.4 |
0.469 |
2030 |
291.8 |
0.501 |
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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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