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
Notes n
Reference Izm2019
Equinox
Last observation 2015
Grade 1 (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
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
WDS 16413+3136 (Zet Her) : ALADIN DSS IMAGE @ 16h 41m 17.16s +31° 36' 09.8"
DSS color
DSS blue
2MASS
AllWISE
GALEX
SDSS9
XMM
PanSTARRS
WDS 16413+3136 STF 2084 (Zet Her) : NEIGHBORHOODS
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
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
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
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
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
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
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
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