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 Discov num STF1967 Comp Coord arcsec 2000 15 42 44.57 +26 17 44.3
Date first 1826 Date last 2015 Obs 491
Pa first 111 Pa last 110.1 P.A. Now (θ) 306.6°
Sep first 0.7 Sep last 0.476 Sep. Now (ρ) 0.11"
Mag pri 4.04 Mag sec 5.60 delta mag (ΔM) 1.56 Spectral class B9V+A3V (blue-white/white)
Pri motion ra -107 Sec motion ra -107
Pri motion dec +048 Sec motion dec +048
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Gam CrB Constellation Corona Borealis SAO 83958 HIP 76952
Tycho2 2036-01674-1 Gaia DR2 1223128521793513984 HD 140436 HR 5849
GC 21130 ADS 9757 BD BD+26 2722 Bayer Gamma Coronae Borealis
Bayer name Gam CrB Flamsteed 8 Coronae Borealis Flamsteed name 8 CrB Distance 44.78
Distance ly 146.07 Bayer greek γ CrB
 
 
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 Notesn ReferenceDRs2012
Equinox Last observation2011 Grade2(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


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



 
 


wds15427%2B2618b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic