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Doubles in session


Current system
16413+3136
STF 2084
Zet Her


Nearby doubles
29' : 16426+3113
SEI 540

36' : 16386+3129
KPP1528

44' : 16416+3053
LSC 66

46' : 16447+3148
COU 804

53' : 16382+3212
ZHN 9

57' : 16371+3119
OSO 73

58' : 16384+3221
SLW1190

60' : 16401+3038
LAU 3

70' : 16460+3213
SLW1195

74' : 16364+3057
PRB 5

76' : 16366+3224
GYL 15

80' : 16414+3016
HDS2368

81' : 16350+3130
RAO 671

81' : 16476+3129
TDS 836

82' : 16358+3219
SEI 539

84' : 16356+3055
TDS9989

85' : 16446+3023
CVR 839

88' : 16356+3048
TDS9990

88' : 16375+3250
SKF2729

89' : 16360+3038
BRT 256

90' : 16413+3006
A 349

91' : 16350+3055
TDS9978

97' : 16385+3006
TDT 16AB

98' : 16345+3220
NSN 680

99' : 16441+3308
TDT 57

105' : 16456+3008
UC 3226



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.

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		  
 
 
WDS 16413+3136 STF 2084 (Zet Her) : NOTES
 
 
discov_num notes refcode
STF2084 zet Her = 40 Her.
Mk III Limb-darkened diameter 2.33 +/- 0.05 mas. MkT2001
Mk III Limb-darkened diameter 2.367 +/- 0.051 mas. MkT2003
NPOI Limb-darkened diameter 2.49 +/- 0.09 mas. NOI2001b
Berman (1941) has discussed the RV's. Ber1941
A subsystem with a period of about 12 yr has repeatedly been
suspected (cf Baize 1976), and the third component has now been Baz1976
detected by infrared speckle interferometry. Mcy1983
No evidence in the speckle or Hipparcos data for the large-amplitude
third-body orbit given by Baize.
See Baize & Petit (1989) catalog of doubles with variable component. Baz1989d
Giant primary according to isochrone fit. Sod1999
H 1 36. MEv2010
Malkov et al. (2012) derive dynamical, photometric, and spectroscopic
masses of 2.44 +/- 1.31, 2.12, and 1.26 Msun, respectively. Mlk2012
 
 
REFERENCES
 
 
refcode metd author reference
Baz1976 orb - Baize, P. 1976A&AS...26..177B
Baz1976 A&AS 26, 177, 1976
Baz1989d - Baize, P. & Petit, M. 1989A&AS...77..497B
Baz1989d A&AS 77, 497, 1989
Ber1941 - Berman, L. 1941PASP...53...22B
Ber1941 PASP 53, 22, 1941
Izm2019 orb u Izmailov, I.S. 2019AstL...45...30I
Izm2019 Ast. Lett. 45, 30, 2019
Izm2019 (Orbital elements from weighted solutions used when available (Table 2),
Izm2019 unweighted elements (Table 1) used for remaining 29 systems.)
Mcy1983 Si - McCarthy, D.W. 1983nssl.conf..107M
Mcy1983 +C IAU Colloq 76, 107, 1983
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT2001 not j Nordgren, T.E., Sudol, J.J. & Mozurkewich, D. 2001AJ....122.2707N
MkT2001 AJ 122, 2707, 2001 .
MkT2003 Km - Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A., 2003AJ....126.2502M
MkT2003 +not Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003 AJ 126, 2502, 2003
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
NOI2001b not j Nordgren, T.E., Sudol, J.J. & Mozurkewich, D. 2001AJ....122.2707N
NOI2001b AJ 122, 2707, 2001 .
Sod1999 orb - Soderhjelm, S. 1999A&A...341..121S
Sod1999 A&A 341, 121, 1999
 
 
DISCOVERER
 
 
idgroup discov author
1 STF Struve, F.G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16413+3136 STF2084 2007 807 198 1.1 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2008 813 185 1.2 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2010 819 173 1.1 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2011 824 166 1.3 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2013 835 149 1.3 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2014 836 141 1.3 2.95 5.40 G1IV NOD 164117.46+313607.0
16413+3136 STF2084 2015 837 134 1.3 2.95 5.40 G1IV NO 164117.46+313607.0
16413+3136 STF2084 2016 840 126 1.5 2.95 5.40 G1IV NO 164117.16+313609.8
16413+3136 STF2084 2017 845 121 1.6 2.95 5.40 G1IV NO 164117.16+313609.8
16413+3136 STF2084 2018 846 115 1.6 2.95 5.40 G1IV NO 164117.16+313609.8
16413+3136 STF2084 2019 856 110 1.6 2.95 5.40 G1IV NO 164117.16+313609.8

If you need more information about this double, apply for a data request form to the WDS.

 
 
WDS 16413+3136 STF 2084 (Zet Her) : VISUAL OBSERVATIONS REPORTS
 
 
Show date username difficulty separation pa_estim interest notes
Show 17/08/26 oldscope very difficult separated     So, at 9:30, I turned my attention to another, more difficult double star that has always eluded me due to its tight separation and dissimilar magnitudes. Also easy to find, it is Zeta Herculis, “a modestly bright third magnitude (2.90) star orbited by a sixth magnitude (5.53) companion only a second of arc or so away.” It’s the ‘bottom right’ corner of the Hercules keystone, below M-13. How many times have you looked at M-13 with some big dob and ignored this great double? The current separation is 1.28 “, not much greater than the 1.01” theoretical limit for a 4-1/2 inch lens but not too hard if you have a lot more aperture and high quality optics. The faintness of the companion, which is easily lost in the diffraction ring of the primary, requires very steady seeing, and the star needs to be viewed while high up in the sky (less atmosphere). Very high power is required and if the Airy disk and diffraction ring are bobbing around, forget it. You won’t pick out the companion. But, finally, we were in luck! At about 47 deg. altitude, the moon setting, and the air very steady (9 out of 10 seeing), I noticed the faint little companion immediately at 343x and it was distinctly separated at 429 x. Just to be sure, I asked Nancy to confirm its position and without hesitation, she identified the exact location that I saw. This is a tough object for a five inch refractor, so I was very pleased with the performance of the 4-1/2 inch Brashear lens on this difficult double star tests. Not long after, I went to look at it again, but the seeing started to deteriorate and it became all but impossible to resolve. It was as if the double was thumbing its nose at me, saying “That’s all you get for now!”

 
 
WDS 16413+3136 STF 2084 (Zet Her) : MEASURES
 
 
No records found.

 
 
WDS 16413+3136 (Zet Her) : VIRTUAL EYEPIECE
 
 

16413+3136 STF2084A mag 2.95 Sp G1IV 16413+3136 STF2084B sep 1.4 P.A. 113.50 mag 5.4 virtual eyepiece
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 16413+3136 (Zet Her) : ALADIN DSS IMAGE @ 16h 41m 17.16s +31° 36' 09.8"
 
 
 
 
WDS 16413+3136 STF 2084 (Zet Her) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

16413+3136 STF2084 distance=0' 16426+3113 SEI 540 distance=29' 16386+3129 KPP1528 distance=36' 16416+3053 LSC 66 distance=44' 16447+3148 COU 804 distance=46' 16382+3212 ZHN 9 distance=53' 16371+3119 OSO 73 distance=57' 16384+3221 SLW1190 distance=58' 16401+3038 LAU 3 distance=60' 16460+3213 SLW1195 distance=70' 16364+3057 PRB 5 distance=74' 16366+3224 GYL 15 distance=76' 16414+3016 HDS2368 distance=80' 16350+3130 RAO 671 distance=81' 16476+3129 TDS 836 distance=81' 16358+3219 SEI 539 distance=82' 16356+3055 TDS9989 distance=84' 16446+3023 CVR 839 distance=85' 16356+3048 TDS9990 distance=88' 16375+3250 SKF2729 distance=88' 16360+3038 BRT 256 distance=89' 16413+3006 A 349 distance=90' 16350+3055 TDS9978 distance=91' 16385+3006 TDT 16AB distance=97' 16385+3006 TDT 16AC distance=97' 16345+3220 NSN 680 distance=98' 16441+3308 TDT 57 distance=99' 16456+3008 UC 3226 distance=105' 16495+3149 GRV 938 distance=106' 16345+3034 UC 220 distance=107' 16431+3321 GRV 935 distance=109' 16457+3000 STF2098DE distance=111' 16457+3000 STF2098AB distance=112' 16457+3000 STF2098AD distance=112' 16457+3000 STF2098AC distance=112' 16332+3054 STF2061 distance=112' 16457+3000 STF2098BC distance=112' 16472+3300 CVR1674 distance=113' 16496+3044 GRV 939 distance=120' 16335+3030 BU 818 distance=121' 16460+3324 KPP1386 distance=123' 16316+3148 COU 620 distance=124' 16351+3318 JOD 10 distance=129' 16319+3046 LDS4675 distance=131' 16518+3151 BU 821 distance=136' 16479+2951 UC 3234 distance=136' 16327+3016 CVR 830 distance=137' 16450+2928 COU 490 distance=138' 16309+3219 CVR 827 distance=139' 16391+3353 CVR1670 distance=140' 16391+2919 TDT 19 distance=141' grafico limitrofi
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Show name coord_2000 discov# comp pa sep dist(')
Show 16413+3136 STF2084 110 1.6
Show 16426+3113 SEI 540 227 11.5 29
Show 16386+3129 KPP1528 141 11.5 36
Show 16416+3053 LSC 66 98 0.0 44
Show 16447+3148 COU 804 15 0.2 46
Show 16382+3212 ZHN 9 74 39.4 53
Show 16371+3119 OSO 73 114 25.1 57
Show 16384+3221 SLW1190 68 13.3 58
Show 16401+3038 LAU 3 263 80.2 60
Show 16460+3213 SLW1195 33 175.4 70
Show 16364+3057 PRB 5 15 999.9 74
Show 16366+3224 GYL 15 144 4.5 76
Show 16414+3016 HDS2368 157 0.8 80
Show 16350+3130 RAO 671 316 3.1 81
Show 16476+3129 TDS 836 217 2.6 81
Show 16358+3219 SEI 539 233 10.8 82
Show 16356+3055 TDS9989 190 0.6 84
Show 16446+3023 CVR 839 254 17.4 85
Show 16356+3048 TDS9990 178 0.6 88
Show 16375+3250 SKF2729 341 27.6 88
Show 16360+3038 BRT 256 180 3.4 89
Show 16413+3006 A 349 127 0.7 90
Show 16350+3055 TDS9978 124 2.1 91
Show 16385+3006 TDT 16 AB 193 0.2 97
Show 16385+3006 TDT 16 AC 72 1.0 97
Show 16345+3220 NSN 680 134 0.9 98
Show 16441+3308 TDT 57 21 0.5 99
Show 16456+3008 UC 3226 268 33.0 105
Show 16495+3149 GRV 938 239 29.9 106
Show 16345+3034 UC 220 51 31.3 107
Show 16431+3321 GRV 935 293 10.5 109
Show 16457+3000 STF2098 DE 268 5.8 111
Show 16457+3000 STF2098 AB 145 14.2 112
Show 16457+3000 STF2098 AD 18 67.6 112
Show 16457+3000 STF2098 AC 128 65.6 112
Show 16332+3054 STF2061 29 2.4 112
Show 16457+3000 STF2098 BC 124 52.4 112
Show 16472+3300 CVR1674 122 3.9 113
Show 16496+3044 GRV 939 207 8.0 120
Show 16335+3030 BU 818 36 4.0 121
Show 16460+3324 KPP1386 255 10.4 123
Show 16316+3148 COU 620 159 2.4 124
Show 16351+3318 JOD 10 140 0.9 129
Show 16319+3046 LDS4675 105 39.2 131
Show 16518+3151 BU 821 324 1.3 136
Show 16479+2951 UC 3234 63 7.3 136
Show 16327+3016 CVR 830 159 11.2 137
Show 16450+2928 COU 490 294 0.1 138
Show 16309+3219 CVR 827 242 29.7 139
Show 16391+3353 CVR1670 235 3.5 140
Show 16391+2919 TDT 19 177 0.5 141

 
 
WDS 16413+3136 : COMPONENTS
 
 
  A
B pa=113.5°
sep=1.42"
 
 
16413+3136 A
 
 
Componente originario normalizzato AB Name Zet Her Coord arcsec 2000 164117.16+313609.8 Mag 2.95
Spectral class G1IV (yellow) PmRA -463.00 PmDE 345.0 SAO 65485
HIP 81693 Tycho2 2582-03158-1 HD 150680 HR 6212
GC 22464 BD BD+31 2884 Bayer Zeta Herculis Bayer name Zet
Flamsteed 40 Herculis Flamsteed name 40 Her
Tycho2
Tycho2 2582-03158-1 Pflag X RAmdeg DEmdeg
PmRA PmDE E RAmdeg E DEmdeg
E pmRA E pmDE EpRAm EpDEm
Num Q RAmdeg Q DEmdeg Q pmRA
Q pmDE BTmag 3.666 E BTmag 0.014 VTmag 2.952
E VTmag 0.009 Prox 16 TYC T HIP 81693
CCDM A RAdeg 250.32277056 DEdeg 31.60193694 EpRA 1990 1.58
EpDE 1990 1.75 E RAdeg 3.2 E DEdeg 3.1 Posflg D
Corr 0.0
SAO
SAO 65485 DelFlag RA1950 PmRA1950 -0.0369
DE1950 PmDE1950 0.394 Vmag 3 SpType G0
Double code Source 71 CatNum 1634 DM BD+31 2884
DMcomp BDsup HD 150680 M HD 0
GC 22464 RA1950rad 4.36070423 DE1950rad 0.5531342 PmRA2000 -0.0368
PmDE2000 0.394
Hipparcos
Catalog H HIP 81693 Proxy H RAhms 16 41 17.48
DEdms +31 36 06.8 Vmag 2.81 VarFlag R Vmag G
RAdeg 250.323 DEdeg 31.6019 AstroRef A Plx 92.63
CCDM 16413+3136 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 78 Rho 1.546 HD 150680 BD BD+31 2884
CD CP Dm number +31 2884 VIred 0.7
SpType F9IV R SpType Coord arcsec 2000 164117.48+313606.8
Hipparcos 2
HIP 81693 Sn 15 So 3 Nc 2
RArad 4.3689574263 DErad 0.5515569741 Plx 93.32 PmRA -461.52
PmDE 342.28 E RArad 0.3 E DErad 0.37 E Plx 0.47
E pmRA 0.38 E pmDE 0.48 Hpmag 2.9338 E Hpmag 0.0004
SHp 0.004 VA 0 BV 0.65 E BV 0.011
VI 0.7
CCDM
Ccdm 16413+3136 RComp Comp A Note1
Note2 @ Discov num DRAs -0.80 DDEs 10.7
R dRAs 12 Year Theta Rho
Obs 2 Vmag 3.0 Sp G0 PmNote
PmRA -554 PmDE 387 Dm number +31 2884 Cat1 BD
Name2 +31 1438 Cat2 AGK2/3 HD 150680 M HD
ADS BDS A10157 M ADS BDS N IDS IDS 16375N3147A
HIC 81693
 
 
16413+3136 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 164117.26+313609.2 Mag 5.4 Calc delta mag 2.45
Calc coord yes
CCDM
Ccdm 16413+3136 RComp Comp B Note1 *
Note2 Discov num STF2084 DRAs DDEs
R dRAs Year 1826 Theta Rho
Obs 99 Vmag 6.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A10157 M ADS BDS N IDS IDS 16375N3147B
HIC 81693