16413+3136 STF2084 (Zet Her)

 
 
16H 41M 17.16S +31 36' 09.8" P.A. 124.1 SEP 1.28 MAG 2.95,5.4 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
2016
Obs
840
Pa first
23
Pa last
126
P.A. Now (θ)
124.1°
Sep first
0.9
Sep last
1.5
Sep. Now (ρ)
1.28"
Mag pri
2.95
Mag sec
5.4
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
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
last precise pa
126.4
last precise sep
1.49
 
 
ORBITAL ELEMENTS
 
 
Period (P)34.45y Periastron (T)1967.7y Semi-major axis (a)1.33a
Eccentricity (e)0.46 Inclination (i)131° Longitude of periastron (ω)111°
Node (Ω)50° Note Grade1(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.695 11.5
2001 0.519 341.0
2002 0.495 296.1
2003 0.639 261.1
2004 0.807 240.3
2005 0.934 226.1
2006 1.016 214.8
2007 1.065 204.9
2008 1.093 195.7
2009 1.110 186.8
2010 1.121 178.2
2011 1.131 169.7
2012 1.145 161.4
2013 1.163 153.3
2014 1.186 145.5
2015 1.214 138.0
2016 1.247 130.9
2017 1.284 124.1
2018 1.323 117.8
2019 1.363 111.8
2020 1.402 106.2
2021 1.440 100.9
2022 1.473 95.8
2023 1.501 90.9
2024 1.521 86.2
2025 1.533 81.6
2026 1.533 77.0
2027 1.520 72.4
2028 1.490 67.6
2029 1.442 62.6
2030 1.371 57.2

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