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Doubles in session


Current system
17121+2114
STF 2135 AB
HD 155642


Nearby doubles
16' : 17111+2106
TDT 255

22' : 17107+2104
TDT 251

22' : 17105+2116
DAM 945

23' : 17122+2137
WFC 189

25' : 17104+2107
ALP 20AB

28' : 17140+2119
COU 111AB

30' : 17103+2127
FAL 56

50' : 17091+2141
DAM 907

52' : 17084+2113
DAM 890AB

53' : 17107+2202
DAM 949

55' : 17082+2110
DAM 887AB

57' : 17133+2208
KPP 635

58' : 17087+2040
BRT2431

62' : 17115+2012
DAM 971AB

63' : 17086+2153
DAM 894

64' : 17099+2209
DAM 927

64' : 17111+2216
DAM 962

71' : 17148+2214
ITF 11

72' : 17147+2215
ITF 156

73' : 17173+2113
HU 668

77' : 17150+2219
ITF 155

79' : 17118+2232
ALP 21

82' : 17147+2227
NSN 688

83' : 17155+2007
HU 489

83' : 17071+2029
SLE 9

85' : 17145+1956
HU 488AB



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.

17121+2114 STF 2135 AB (HD 155642)

 
 
17h 12m 06.06s +21° 13' 44.4" P.A. 194.00 sep 8.7 mag 7.59,8.88 Sp K0 dist. 152.44 pc (497.26 l.y.)
 
 
Coord 2000 17121+2114 Discov num STF2135 Comp AB Coord arcsec 2000 17 12 06.06 +21 13 44.4
Date first 1829 Date last 2018 Obs 170
Pa first 166 Pa last 194.2 P.A. Now (θ) 194.2°
Sep first 6.7 Sep last 8.694 Sep. Now (ρ) 8.694"
Mag pri 7.59 Mag sec 8.88 delta mag (ΔM) 1.29 Spectral class K0 (yellow-orange)
Pri motion ra +022 Sec motion ra -001
Pri motion dec +002 Sec motion dec -011
Notes C (Has orbit and linear solution)
rPM=1.196
This double is physical.
 
 
17121+2114 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 155642 84910 17 12 06 +21 13 44 STF 2135 AB 2018 170 194 8.7 7.59 8.88 1.29 Y <===
Show 84910 17 12 06 +21 13 44 STF 2135 AC 2015 7 208 162.1 7.59 12.91 5.32
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 155642 Constellation Hercules SAO 84910 HIP 84137
Tycho2 1548-00181-1 Gaia DR2 4567068631146723456 HD 155642 GC 23216
BD BD+21 3063 Distance 152.44 Distance ly 497.26
 
 
ORBITAL ELEMENTS
 
 
Period (P)2228.9851y± 935.2933 Periastron (T)2283.7475y± 168.9042 Semi-major axis (a)23.83872a± 12.08057
Eccentricity (e)0.80812± 0.151 Inclination (i)80.053°± 7.727 Longitude of periastron (ω)252.621°± 27.491
Node (Ω)40.759°± 7.512 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 192.0 8.412
2001 192.2 8.425
2002 192.3 8.438
2003 192.4 8.452
2004 192.6 8.465
2005 192.7 8.478
2006 192.8 8.491
2007 192.9 8.504
2008 193.1 8.517
2009 193.2 8.530
2010 193.3 8.543
2011 193.5 8.555
2012 193.6 8.568
2013 193.7 8.581
2014 193.8 8.594
2015 194.0 8.607
2016 194.1 8.620
2017 194.2 8.632
2018 194.3 8.645
2019 194.5 8.658
2020 194.6 8.670
2021 194.7 8.683
2022 194.8 8.696
2023 195.0 8.708
2024 195.1 8.721
2025 195.2 8.733
2026 195.3 8.746
2027 195.4 8.758
2028 195.6 8.771
2029 195.7 8.783
2030 195.8 8.795


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


 
  


wds17121%2B2114a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 17121+2114 STF 2135 AB (HD 155642) : NOTES
 
 
discov_num notes refcode
STF2135 Despite having an orbit, an optical pair based on parallax. Mlk2022
 
 
REFERENCES
 
 
refcode metd author reference
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.)
Mlk2022 not - Chulkov, D. & Malkov, O. 2022MNRAS.517.2925C
Mlk2022 MNRAS 517, 2925, 2022
 
 
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
17121+2114 STF2135 AB 2007 148 193 8.5 7.59 8.88 K0 LD 171206.06+211344.4
17121+2114 STF2135 AB 2008 150 193 8.5 7.59 8.88 K0 LD 171206.06+211344.4
17121+2114 STF2135 AB 2010 152 193 8.4 7.59 8.88 K0 LD 171206.06+211344.4
17121+2114 STF2135 AB 2012 155 194 8.5 7.59 8.88 K0 LD 171206.06+211344.4
17121+2114 STF2135 AB 2014 156 194 8.7 7.59 8.88 K0 LD 171206.06+211344.4
17121+2114 STF2135 AB 2015 167 194 8.6 7.59 8.88 K0 L 171206.06+211344.4
17121+2114 STF2135 AB 2017 168 195 8.7 7.59 8.88 K0 L 171206.06+211344.4
17121+2114 STF2135 AB 2018 170 195 8.7 7.59 8.88 K0 L 171206.06+211344.4

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

 
 
WDS 17121+2114 STF 2135 AB (HD 155642) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 17121+2114 STF 2135 AB (HD 155642) : MEASURES
 
 
Records found: 1
Show date username difficulty sep sep_sigma pa pa_sigma delta_mag # notes
Show 12/06/08 northisup easy 8.00   198.00     1
 
 
WDS 17121+2114 (HD 155642) : VIRTUAL EYEPIECE
 
 

17121+2114 STF2135A mag 7.59 Sp K0 17121+2114 STF2135B sep 8.7 P.A. 193.30 mag 8.88 17121+2114 STF2135C sep 159.8 P.A. 206.20 mag 12.91 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 17121+2114 (HD 155642) : ALADIN DSS IMAGE @ 17h 12m 06.06s +21° 13' 44.4"
 
 
 
 
WDS 17121+2114 STF 2135 AB (HD 155642) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

17121+2114 STF2135AB distance=0' 17111+2106 TDT 255 distance=16' 17107+2104 TDT 251 distance=22' 17105+2116 DAM 945 distance=22' 17122+2137 WFC 189 distance=23' 17104+2107 ALP 20AB distance=25' 17104+2107 ALP 20AC distance=25' 17140+2119 COU 111AB distance=28' 17140+2119 GII 242Aa,Ab distance=28' 17103+2127 FAL 56 distance=30' 17091+2141 DAM 907 distance=50' 17084+2113 DAM 890AB distance=52' 17084+2113 DAM 890AC distance=52' 17107+2202 DAM 949 distance=53' 17082+2110 DAM 887AB distance=55' 17082+2110 DAM 887AC distance=55' 17133+2208 KPP 635 distance=57' 17087+2040 BRT2431 distance=58' 17115+2012 DAM 971AB distance=62' 17115+2012 DAM 971AC distance=62' 17086+2153 DAM 894 distance=63' 17099+2209 DAM 927 distance=64' 17111+2216 DAM 962 distance=64' 17148+2214 ITF 11 distance=71' 17147+2215 ITF 156 distance=72' 17173+2113 HU 668 distance=73' 17150+2219 ITF 155 distance=77' 17118+2232 ALP 21 distance=79' 17147+2227 NSN 688 distance=82' 17155+2007 HU 489 distance=83' 17071+2029 SLE 9 distance=83' 17145+1956 HU 488AB distance=85' 17082+2228 DAM 886 distance=92' 17064+2208 COU 109 distance=96' 17063+2205 HO 556 distance=96' 17187+2146 STTA152 distance=98' 17093+2244 OSO 76 distance=99' 17084+1950 RAO 673AE distance=100' 17087+1945 J 1130 distance=101' 17067+2225 COU 110 distance=104' 17139+2255 TDT 274 distance=104' 17045+2123 UC 3285 distance=107' 17080+2244 BRT2430 distance=107' 17129+2309 COU 314 distance=116' 17093+2304 POU3258 distance=118' 17142+1919 STF2139 distance=119' 17109+1915 DAM 954BC distance=120' 17109+1915 DAM 954BD distance=120' 17109+1915 DAM 954AB distance=120' 17109+1915 DAM 954AC distance=120' 17109+1915 DAM 954AD distance=120' 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 17121+2114 STF2135 AB 194 8.7
Show 17121+2114 STF2135 AC 208 162.1
Show 17111+2106 TDT 255 200 0.6 16
Show 17107+2104 TDT 251 302 0.5 22
Show 17105+2116 DAM 945 321 7.8 22
Show 17122+2137 WFC 189 302 6.6 23
Show 17104+2107 ALP 20 AB 278 7.7 25
Show 17104+2107 ALP 20 AC 124 24.0 25
Show 17140+2119 COU 111 AB 250 0.6 28
Show 17140+2119 GII 242 Aa,Ab 9 0.1 28
Show 17103+2127 FAL 56 99 8.8 30
Show 17091+2141 DAM 907 324 4.0 50
Show 17084+2113 DAM 890 AB 255 2.9 52
Show 17084+2113 DAM 890 AC 164 9.5 52
Show 17107+2202 DAM 949 234 4.2 53
Show 17082+2110 DAM 887 AB 309 8.5 55
Show 17082+2110 DAM 887 AC 106 31.5 55
Show 17133+2208 KPP 635 81 5.8 57
Show 17087+2040 BRT2431 317 4.7 58
Show 17115+2012 DAM 971 AB 318 1.0 62
Show 17115+2012 DAM 971 AC 99 3.9 62
Show 17086+2153 DAM 894 74 8.3 63
Show 17099+2209 DAM 927 22 6.3 64
Show 17111+2216 DAM 962 303 6.6 64
Show 17148+2214 ITF 11 41 4.3 71
Show 17147+2215 ITF 156 26 14.1 72
Show 17173+2113 HU 668 38 1.3 73
Show 17150+2219 ITF 155 190 2.3 77
Show 17118+2232 ALP 21 53 36.6 79
Show 17147+2227 NSN 688 111 2.9 82
Show 17155+2007 HU 489 36 1.0 83
Show 17071+2029 SLE 9 173 19.7 83
Show 17145+1956 HU 488 AB 106 2.9 85
Show 17082+2228 DAM 886 234 9.0 92
Show 17064+2208 COU 109 140 8.5 96
Show 17063+2205 HO 556 140 8.5 96
Show 17187+2146 STTA152 47 52.8 98
Show 17093+2244 OSO 76 313 15.5 99
Show 17084+1950 RAO 673 AE 114 7.7 100
Show 17087+1945 J 1130 279 1.3 101
Show 17067+2225 COU 110 90 1.4 104
Show 17139+2255 TDT 274 234 0.6 104
Show 17045+2123 UC 3285 249 20.3 107
Show 17080+2244 BRT2430 331 3.7 107
Show 17129+2309 COU 314 1.9 116
Show 17093+2304 POU3258 59 10.9 118
Show 17142+1919 STF2139 335 8.3 119
Show 17109+1915 DAM 954 BC 68 9.6 120
Show 17109+1915 DAM 954 BD 261 7.7 120
Show 17109+1915 DAM 954 AB 312 18.8 120
Show 17109+1915 DAM 954 AC 342 16.9 120

 
 
WDS 17121+2114 : COMPONENTS
 
 
  A B
B pa=193.3°
sep=8.66"
 
C pa=206.2°
sep=159.81"
pa=206.9°
sep=151.38"
 
 
17121+2114 A
 
 
Name HD 155642 Coord arcsec 2000 171206.06+211344.4 Mag 7.59 Spectral class K0 (yellow-orange)
PmRA 22.00 PmDE 2.0 SAO 84910 HIP 84137
Tycho2 1548-00181-1 HD 155642 GC 23216 BD BD+21 3063
Tycho2
Tycho2 1548-00181-1 Pflag RAmdeg 258.02530081 DEmdeg 21.22900398
PmRA 21.8 PmDE 3.5 E RAmdeg 5 E DEmdeg 5
E pmRA 1.0 E pmDE 0.9 EpRAm 1991.29 EpDEm 1991.31
Num 10 Q RAmdeg 1.2 Q DEmdeg 1.4 Q pmRA 1.1
Q pmDE 1.4 BTmag 9.095 E BTmag 0.016 VTmag 7.593
E VTmag 0.010 Prox 83 TYC T HIP 84137
CCDM A RAdeg 258.02524639 DEdeg 21.22899583 EpRA 1990 1.60
EpDE 1990 1.68 E RAdeg 4.7 E DEdeg 4.5 Posflg
Corr -0.1
SAO
SAO 84910 DelFlag RA1950 PmRA1950 0.0017
DE1950 PmDE1950 0.004 Vmag 7.2 SpType K0
Double code Source 70 CatNum 23216 DM BD+21 3063
DMcomp A BDsup HD 155642 M HD 0
GC 23216 RA1950rad 4.49404979 DE1950rad 0.37154555 PmRA2000 0.0018
PmDE2000 0.006
Hipparcos
Catalog H HIP 84137 Proxy H RAhms 17 12 06.06
DEdms +21 13 44.4 Vmag 7.26 VarFlag 1 R Vmag G
RAdeg 258.025 DEdeg 21.229 AstroRef A Plx 6.26
CCDM 17121+2113 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 191 Rho 8.276 HD 155642 BD BD+21 3063
CD CP Dm number +21 3063 VIred 1.2
SpType K0+... R SpType Coord arcsec 2000 171206.06+211344.4
Hipparcos 2
HIP 84137 Sn 15 So 3 Nc 2
RArad 4.503389983 DErad 0.3705158547 Plx 6.56 PmRA 24.79
PmDE 2.36 E RArad 0.51 E DErad 0.66 E Plx 0.99
E pmRA 0.77 E pmDE 0.98 Hpmag 7.4102 E Hpmag 0.0015
SHp 0.015 VA 2 BV 1.241 E BV 0.015
VI 1.2
 
 
17121+2114 B
 
 
Coord arcsec 2000 171205.92+211336.0 Mag 8.88 PmRA -1.00 PmDE -11.0
Tycho2 1548-00181-2 Calc delta mag 1.29 Calc coord yes
Tycho2
Tycho2 1548-00181-2 Pflag RAmdeg 258.02477389 DEmdeg 21.22670561
PmRA -0.6 PmDE -7.9 E RAmdeg 9 E DEmdeg 9
E pmRA 1.1 E pmDE 1.1 EpRAm 1990.87 EpDEm 1990.96
Num 4 Q RAmdeg 0.4 Q DEmdeg 0.6 Q pmRA 0.5
Q pmDE 0.5 BTmag 10.277 E BTmag 0.026 VTmag 8.881
E VTmag 0.014 Prox 83 TYC T HIP 84137
CCDM B RAdeg 258.02477528 DEdeg 21.22672389 EpRA 1990 1.61
EpDE 1990 1.66 E RAdeg 9.3 E DEdeg 9.2 Posflg
Corr 0.0
 
 
17121+2114 C
 
 
Coord arcsec 2000 171201.02+211121.0 Mag 12.91 PmRA -1.00 PmDE -16.0
Calc delta mag 5.32 Calc coord yes