15232+3017 STF1937AB (Eta CrB)

 
 
15H 23M 12.23S +30 17' 17.7" P.A. 237.9 SEP 0.46 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
2016
Obs
1076
Pa first
35
Pa last
217
P.A. Now (θ)
237.9°
Sep first
1.1
Sep last
0.6
Sep. Now (ρ)
0.46"
Mag pri
5.64
Mag sec
5.95
delta mag (ΔM)
0.31
Spectral class
F8V+G0V (yellow-white/yellow)
Pri motion ra
+140
Sec motion ra
Pri motion dec
-185
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
15232+3017 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Eta CrB 64673 15232+3017 STF1937 AB 1826 2016 1076 238 0.5 5.64 5.95 0.31 Y <===
Show 64673 15232+3017 STF1937 AB,C 1856 2006 8 359 73.7 4.98 13.35 8.37
Show 64673 15232+3017 STF1937 AB,D 1879 2006 8 41 217.7 4.98 11.00 6.02
Show 64673 15232+3017 KIR 4 AB,E 2000 2000 1 136 193.5 4.98 17.00 12.02
Quintuple system
6 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
Eta 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
last precise pa
217.2
last precise sep
0.63
 
 
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 Note Grade1(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.745 63.7
2001 0.690 70.1
2002 0.637 77.5
2003 0.589 86.2
2004 0.548 96.4
2005 0.519 107.9
2006 0.506 120.4
2007 0.508 133.2
2008 0.526 145.4
2009 0.554 156.6
2010 0.589 166.7
2011 0.623 175.6
2012 0.651 183.6
2013 0.667 191.1
2014 0.665 198.4
2015 0.643 206.0
2016 0.598 214.4
2017 0.534 224.6
2018 0.460 237.9
2019 0.392 256.1
2020 0.356 280.0
2021 0.371 305.4
2022 0.432 326.0
2023 0.517 340.7
2024 0.609 351.1
2025 0.699 358.7
2026 0.780 4.7
2027 0.851 9.6
2028 0.911 13.8
2029 0.959 17.5
2030 0.996 21.0

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic