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Doubles in session


Current system
15427+2618
STF 1967
Gam CrB


Nearby doubles
5' : 15430+2617
FLA 2

7' : 15429+2624
BRT 167

29' : 15438+2553
LDT 12

32' : 15418+2647
CBL 493

40' : 15419+2655
TDS9592

46' : 15458+2637
COU 615

54' : 15454+2538
PST 5AB

59' : 15449+2708
CVR1645

60' : 15390+2545
COU 612

66' : 15455+2523
KPP3968

67' : 15380+2556
TDS9569

80' : 15485+2600
COU 616

81' : 15371+2646
HDS2199AB

82' : 15371+2650
GRV1211

83' : 15390+2723
KPP2324

85' : 15404+2500
LDS4578

98' : 15474+2504
RAO 665

102' : 15397+2751
KPP3963

102' : 15499+2547
HLM 6

102' : 15355+2647
SHN 202

105' : 15495+2528
STF1977AB

106' : 15366+2726
MLB 690

107' : 15416+2803
KPP3966

107' : 15358+2527
LDS4569

109' : 15508+2615
TDS9657

109' : 15361+2517
HDS2192



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

15427+2618 STF 1967 (Gam CrB)

 
 
15h 42m 44.57s +26° 17' 44.3" P.A. 121.00 sep 0.6 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 2021 Obs 493
Pa first 111 Pa last 120.7 P.A. Now (θ) 296.8°
Sep first 0.7 Sep last 0.617 Sep. Now (ρ) 0.261"
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
2031 291.3 0.525
2032 290.8 0.542
2033 290.3 0.554
2034 289.8 0.560
2035 289.4 0.562
2036 288.9 0.560
2037 288.5 0.554
2038 288.0 0.546
2039 287.5 0.534
2040 287.0 0.521
2041 286.4 0.505
2042 285.9 0.487
2043 285.2 0.468
2044 284.6 0.447
2045 283.8 0.425
2046 283.0 0.401
2047 282.0 0.377
2048 281.0 0.352
2049 279.7 0.326
2050 278.2 0.300


 
 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