15232+3017 STF 1937 AB
15h 23m 12.23s +30° 17' 17.7" P.A. 287.00 sep 0.4 mag 5.64,5.95 Sp F8V+G0V dist. 17.86 pc (58.26 l.y.)
| Coord 2000 |
15232+3017 |
|
Discov num |
STF1937 |
|
Comp |
AB |
|
Coord arcsec 2000 |
15 23 12.23 +30 17 17.7 |
|
| Date first |
1826 |
|
Date last |
2020 |
|
Obs |
1102 |
|
| Pa first |
35 |
|
Pa last |
287.3 |
|
P.A. Now (θ) |
340.7° |
|
| Sep first |
1.1 |
|
Sep last |
0.37 |
|
Sep. Now (ρ) |
0.517" |
|
| Mag pri |
5.64 |
|
Mag sec |
5.95 |
|
delta mag (ΔM) |
0.31 |
|
Spectral class |
F8V+G0V (yellow-white/yellow) |
|
| Pri motion ra |
+117 |
|
Sec motion ra |
+117 |
|
| Pri motion dec |
-171 |
|
Sec motion dec |
-171 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
15232+3017 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
64673 |
15 23 12 +30 17 18 |
STF 1937 AB |
2020 |
1102 |
287 |
0.4 |
5.64 |
5.95 |
0.31 |
Y |
<=== |
| Show |
|
64673 |
15 23 12 +30 17 18 |
STF 1937 AB,C |
2016 |
10 |
358 |
75.1 |
4.98 |
13.35 |
8.37 |
|
|
| Show |
Eta CrB |
64673 |
15 23 12 +30 17 18 |
STF 1937 AB,D |
2016 |
10 |
40 |
217.9 |
4.98 |
11.00 |
6.02 |
|
|
| Show |
|
64673 |
15 23 12 +30 17 18 |
KIR 4 AB,E |
2010 |
2 |
137 |
193.6 |
4.98 |
17.00 |
12.02 |
|
|
Quintuple system
6 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Var name |
NSV7054 CrB |
|
Constellation |
Corona Borealis |
|
SAO |
64673 |
|
HIP |
75312 |
|
| Tycho2 |
2563-01366-1 |
|
HD |
137107 |
|
HR |
5727 |
|
GC |
20696 |
|
| ADS |
9617 |
|
GL |
Gl 584A |
|
BD |
BD+30 2653 |
|
Bayer |
Eta Coronae Borealis |
|
| Bayer name |
Eta CrB |
|
Flamsteed |
2 Coronae Borealis |
|
Flamsteed name |
2 CrB |
|
Distance |
17.86 |
|
| Distance ly |
58.26 |
|
Bayer greek |
η CrB |
|
ORBITAL ELEMENTS
| Period (P) | 15204.9d (41.63y) | ± 1.4 |
Periastron (T) | 42612.9m (1975.547y) | ± 3.4 |
Semi-major axis (a) | 0.86226a | ± 0.00033 |
| Eccentricity (e) | 0.27907 | ± 0.00026 |
Inclination (i) | 58.084° | ± 0.026 |
Longitude of periastron (ω) | 39.885° | ± 0.064 |
| Node (Ω) | 202.827° | ± 0.024 |
Notes | n | |
Reference | Mut2010b | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
63.7 |
0.745 |
| 2001 |
70.1 |
0.690 |
| 2002 |
77.5 |
0.637 |
| 2003 |
86.2 |
0.589 |
| 2004 |
96.4 |
0.548 |
| 2005 |
107.9 |
0.519 |
| 2006 |
120.4 |
0.506 |
| 2007 |
133.2 |
0.508 |
| 2008 |
145.4 |
0.526 |
| 2009 |
156.6 |
0.554 |
| 2010 |
166.7 |
0.589 |
| 2011 |
175.6 |
0.623 |
| 2012 |
183.6 |
0.651 |
| 2013 |
191.1 |
0.667 |
| 2014 |
198.4 |
0.665 |
| 2015 |
206.0 |
0.643 |
| 2016 |
214.4 |
0.598 |
| 2017 |
224.6 |
0.534 |
| 2018 |
237.9 |
0.460 |
| 2019 |
256.1 |
0.392 |
| 2020 |
280.0 |
0.356 |
| 2021 |
305.4 |
0.371 |
| 2022 |
326.0 |
0.432 |
| 2023 |
340.7 |
0.517 |
| 2024 |
351.1 |
0.609 |
| 2025 |
358.7 |
0.699 |
| 2026 |
4.7 |
0.780 |
| 2027 |
9.6 |
0.851 |
| 2028 |
13.8 |
0.911 |
| 2029 |
17.5 |
0.959 |
| 2030 |
21.0 |
0.996 |
|
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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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