16341+4226 LAB 4 (Sig Her)

 
 
16h 34m 06.19s +42° 26' 12.8" P.A. 15.00 sep 0.1 mag 4.20,7.70 Sp B9V dist. 96.53 pc (314.88 l.y.)
 
 
Coord 2000 16341+4226 Discov num LAB   4 Comp Coord arcsec 2000 16 34 06.19 +42 26 12.8
Date first 1972 Date last 2008 Obs 69
Pa first 179 Pa last 14.9 P.A. Now (θ) 16.2°
Sep first 0.1 Sep last 0.113 Sep. Now (ρ) 0.113"
Mag pri 4.20 Mag sec 7.70 delta mag (ΔM) 3.5 Spectral class B9V (blue-white)
Pri motion ra -011 Sec motion ra
Pri motion dec +046 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Sig Her Var name NSV7837 Her Constellation Hercules SAO 46161
HIP 81126 Tycho2 3066-02213-1 Gaia DR2 1357126587985344896 HD 149630
HR 6168 GC 22296 BD BD+42 2724 Bayer Sigma Herculis
Bayer name Sig Her Flamsteed 35 Herculis Flamsteed name 35 Her FK5 621
Distance 96.53 Distance ly 314.88 Bayer greek σ Her
 
 
ORBITAL ELEMENTS
 
 
Period (P)2706.19d (7.41y)± 4.89 Periastron (T)50665.4d (1997.593y)± 2.68 Semi-major axis (a)76.21m± 0.27
Eccentricity (e)0.5135± 0.0028 Inclination (i)105.25°± 0.51 Longitude of periastron (ω)184.97°± 0.4
Node (Ω)14.95°± 0.47 Notesn ReferenceNOI2016
Equinox2000 Last observation2004 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 20.5 0.099
2001-01-01 15.1 0.115
2002-01-01 10.1 0.107
2003-01-01 2.6 0.076
2004-01-01 329.4 0.024
2005-01-01 193.7 0.037
2006-01-01 45.3 0.032
2007-01-01 23.6 0.085
2008-01-01 17.1 0.111
2009-01-01 12.2 0.113
2010-01-01 6.3 0.092
2011-01-01 352.4 0.047
2012-01-01 217.7 0.026
2013-01-01 120.0 0.014
2014-01-01 28.1 0.067
2015-01-01 19.4 0.104
2016-01-01 14.2 0.115
2017-01-01 9.0 0.103
2018-01-01 0.4 0.068
2019-01-01 299.2 0.016
2020-01-01 184.3 0.032
2021-01-01 37.0 0.043
2022-01-01 22.1 0.092
2023-01-01 16.2 0.113
2024-01-01 11.3 0.111
2025-01-01 4.8 0.086
2026-01-01 345.8 0.037
2027-01-01 204.8 0.034
2028-01-01 70.3 0.019
2029-01-01 25.8 0.075
2030-01-01 18.3 0.107


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



 
 


wds16341%2B4226c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic