16413+3136 STF 2084 (Zet Her)

 
 
16h 41m 17.16s +31 36' 09.8" P.A. 110.00 sep 1.6 mag 2.95,5.40 Sp G1IV dist. 10.72 pc (34.97 l.y.)
 
 
Coord 2000 16413+3136 Discov num STF2084 Comp Coord arcsec 2000 16 41 17.16 +31 36 09.8
Date first 1826 Date last 2019 Obs 862
Pa first 23 Pa last 110.3 P.A. Now (θ) 90.4°
Sep first 0.9 Sep last 1.63 Sep. Now (ρ) 1.53"
Mag pri 2.95 Mag sec 5.40 delta mag (ΔM) 2.45 Spectral class G1IV (yellow)
Pri motion ra -463 Sec motion ra
Pri motion dec +345 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Zet Her Var name NSV7915 Her Constellation Hercules SAO 65485
HIP 81693 Tycho2 2582-03158-1 HD 150680 HR 6212
GC 22464 ADS 10157 GL Gl 635A BD BD+31 2884
Bayer Zeta Herculis Bayer name Zet Her Flamsteed 40 Herculis Flamsteed name 40 Her
Distance 10.72 Distance ly 34.97 Bayer greek ζ Her
 
 
ORBITAL ELEMENTS
 
 
Period (P)34.4638y± 0.0251 Periastron (T)1933.3518y± 0.0492 Semi-major axis (a)1.32834a± 0.00807
Eccentricity (e)0.46342± 0.00417 Inclination (i)131.6°± 0.578 Longitude of periastron (ω)113.177°± 0.803
Node (Ω)50.601°± 0.746 Notesn ReferenceIzm2019
Equinox Last observation2015 Grade1(1=Definitive, 9=Indet.)
label theta rho
2000 12.9 0.714
2001 343.9 0.533
2002 299.7 0.493
2003 263.3 0.624
2004 241.4 0.789
2005 226.5 0.915
2006 214.7 0.997
2007 204.4 1.046
2008 194.8 1.075
2009 185.6 1.094
2010 176.6 1.108
2011 167.9 1.124
2012 159.4 1.142
2013 151.3 1.166
2014 143.5 1.194
2015 136.1 1.228
2016 129.1 1.265
2017 122.6 1.306
2018 116.4 1.348
2019 110.6 1.391
2020 105.2 1.431
2021 100.0 1.469
2022 95.1 1.503
2023 90.4 1.530
2024 85.8 1.549
2025 81.3 1.559
2026 76.9 1.557
2027 72.4 1.542
2028 67.7 1.511
2029 62.8 1.461
2030 57.5 1.389


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



 
 


wds16413%2B3136c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic