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Doubles in session


Current system
18212+2820
STF 2312
HD 168955


Nearby doubles
14' : 18220+2812
UC 3562

30' : 18191+2808
HJ 1318

33' : 18235+2810
JOD 15

36' : 18227+2849
UC 3566

37' : 18238+2808
GRV1261

39' : 18230+2742
HJ 1322

40' : 18242+2818
A 244

48' : 18185+2749
COU1008

49' : 18208+2732
BU 640

50' : 18249+2817
RAO 391

50' : 18173+2825
GRV 232

52' : 18173+2832
LDS4782

57' : 18233+2731
HO 83

58' : 18253+2805
HO 85AB

60' : 18257+2828
TDT 858

68' : 18165+2848
KPP4098

75' : 18265+2842
HJ 1324

76' : 18250+2724
STF2315AB

79' : 18270+2832
MLB 648

80' : 18191+2935
A 242

81' : 18169+2718
MIL 4

82' : 18164+2912
OSO 97AB

83' : 18271+2754
TDS 921

85' : 18156+2902
KPP1398

86' : 18175+2931
COU 814

89' : 18273+2856
HO 433



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.

18212+2820 STF 2312 (HD 168955)

 
 
18h 21m 09.08s +28° 20' 03.5" P.A. 341.00 sep 1.7 mag 9.28,9.91 Sp A0 dist. 404.86 pc (1320.65 l.y.)
 
 
Coord 2000 18212+2820 Discov num STF2312 Comp Coord arcsec 2000 18 21 09.08 +28 20 03.5
Date first 1831 Date last 2016 Obs 31
Pa first 337 Pa last 340.6 P.A. Now (θ) 340.6°
Sep first 1.5 Sep last 1.652 Sep. Now (ρ) 1.652"
Mag pri 9.28 Mag sec 9.91 delta mag (ΔM) 0.63 Spectral class A0 (white)
Pri motion ra -009 Sec motion ra -009
Pri motion dec -007 Sec motion dec -007
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 168955 Constellation Hercules SAO 85958 HIP 89947
Tycho2 2105-00028-1 Gaia DR2 4586670136033198592 HD 168955 GC 25058
BD BD+28 2982 Distance 404.86 Distance ly 1320.65
 
 
WDS 18212+2820 STF 2312 (HD 168955) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
STFA (F. Struve DD - Appendix list #1) ...................
STFB (F. Struve DD - Appendix list #2) ...................
StF1833A Ma - Struve, F.G.W. 1833MmRAS...5...13H
StF1833A +Mc cited by Herschel (MemRAS 5, 13, 1833)
StF1833B Ma - Struve, F.G.W. 1833AN.....10..389B
StF1833B cited by Bessel (AN 10, 389, 1833)
StF1837 Ma - Struve, F.G.W. 1837AN.....14...249
StF1837 Stellarum duplicium et multiplicium mensurae micrometricae...
StF1837 (Dorpat, Academiae scientiarum caesareae petropolitaneifique), 1837
StF1844A Ma - Struve, F.G.W. 1844QB43.S66.......
StF1844A cited by Smyth (Cycle of Celestial Objects 2, 1844)
StF1852A Ma - Struve, F.G.W. .
StF1852A cited by Bishop (Bishop Obs. Astron. Observations 1852)
StF1865A Ma - Struve, F.G.W. 1865AN.....64...81E
StF1865A cited by Engelmann (AN 64, 81, #1518, 1865)
StF1875A Ma - Struve, F.G.W. 1875AN.....85..323D
StF1875A cited by Doberck, 1875 (see Dob1875b,f,g,h)
StF1878 Ma - Struve, F.G.W. .
StF1878 Pulkova Observations 9, 1878
StF1878B Ma - Struve, F.G.W. 1878Obs.....2..239G
StF1878B cited by Gledhill (Obs 2, 239, 1878)
StF1880A Ma - Struve, F.G.W. 1880Obs.....3..535G
StF1880A cited by Gledhill (Obs 3, 535, 1880)
StF1906A Ma - Struve, F.G.W. 1906QB821.B972.....
StF1906A cited in BDS (Burnham Double Star Cat.), 1906
StF1906B Ma - Struve, F.G.W. 1906MmRAS..56....1L
StF1906B cited by Lewis (MemRAS 56, 1, 1906)
StF1922A Ma - Struve, F.G.W. 1922AN....216...49R
StF1922A cited by Rabe (AN 216, 49, 1922)
StF1932A Ma - Struve, F.G.W. 1932QB821.A43......
StF1932A cited in ADS (Aitken Double Star Cat.), 1932
StF2002 - - Weis, J.
StF2002 F. G. W. Struve's double stars : the Dorpat catalogue; the Pulkovo catalogue
StF2002 USNO Library : QB 821 .S8 W49 2002
StF2022 - - email note from Jan Weis: 6 July 2022
StF9999 Ma - Struve, F.G.W. ...................
StF9999 Unpublished, manuscript or reference not found.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18212+2820 STF2312 2005 27 341 1.6 9.28 9.91 A0 D 182109.08+282003.5
18212+2820 STF2312 2010 28 340 1.6 9.28 9.91 A0 D 182109.08+282003.5
18212+2820 STF2312 2011 29 340 1.6 9.28 9.91 A0 182109.08+282003.5
18212+2820 STF2312 2015 30 341 1.7 9.28 9.91 A0 182109.08+282003.5
18212+2820 STF2312 2016 31 341 1.7 9.28 9.91 A0 182109.08+282003.5

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

 
 
WDS 18212+2820 STF 2312 (HD 168955) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18212+2820 STF 2312 (HD 168955) : MEASURES
 
 
No records found.

 
 
WDS 18212+2820 (HD 168955) : VIRTUAL EYEPIECE
 
 

18212+2820 STF2312A mag 9.28 Sp A0 18212+2820 STF2312B sep 1.6 P.A. 342.80 mag 9.91 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 18212+2820 (HD 168955) : ALADIN DSS IMAGE @ 18h 21m 09.08s +28° 20' 03.5"
 
 
 
 
WDS 18212+2820 STF 2312 (HD 168955) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18212+2820 STF2312 distance=0' 18220+2812 UC 3562 distance=14' 18191+2808 HJ 1318 distance=30' 18235+2810 JOD 15 distance=33' 18227+2849 UC 3566 distance=36' 18238+2808 GRV1261 distance=37' 18230+2742 HJ 1322 distance=39' 18242+2818 A 244 distance=40' 18185+2749 COU1008 distance=48' 18208+2732 BU 640 distance=49' 18249+2817 RAO 391 distance=50' 18173+2825 GRV 232 distance=50' 18173+2832 LDS4782 distance=52' 18233+2731 HO 83 distance=57' 18253+2805 HDS2604Aa,Ab distance=58' 18253+2805 HO 85AB distance=58' 18257+2828 TDT 858 distance=60' 18165+2848 KPP4098 distance=68' 18250+2724 HO 84DE distance=75' 18265+2842 HJ 1324 distance=75' 18250+2724 STF2315AB distance=76' 18250+2724 STF2315AC distance=76' 18250+2724 BU 9009AD distance=76' 18270+2832 MLB 648 distance=79' 18191+2935 A 242 distance=80' 18169+2718 MIL 4 distance=81' 18164+2912 OSO 97AB distance=82' 18164+2912 OSO 97AC distance=82' 18164+2912 OSO 97AD distance=82' 18271+2754 TDS 921 distance=83' 18156+2902 KPP1398 distance=85' 18175+2931 COU 814 distance=86' 18273+2856 HO 433 distance=89' 18280+2837 COU 638 distance=93' 18265+2721 BU 264 distance=93' 18176+2659 HJ 1317 distance=93' 18170+2937 UC 238 distance=94' 18194+2955 AG 360 distance=98' 18139+2851 COU 637 distance=101' 18190+2643 TDT 792 distance=101' 18251+2654 AG 361 distance=101' 18223+2633 TDT 819 distance=108' 18130+2815 H 5 93 distance=108' 18177+2642 TDT 779 distance=109' 18259+2652 UC 3578 distance=109' 18169+2647 A 240 distance=109' 18178+2640 LEP 88 distance=110' 18257+2649 DAM1237 distance=110' 18230+3007 HDS2599 distance=110' 18129+2800 ES 472 distance=111' 18172+2640 A 241 distance=113' 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 18212+2820 STF2312 341 1.7
Show 18220+2812 UC 3562 313 15.6 14
Show 18191+2808 HJ 1318 140 10.0 30
Show 18235+2810 JOD 15 176 1.2 33
Show 18227+2849 UC 3566 180 32.0 36
Show 18238+2808 GRV1261 16 2.2 37
Show 18230+2742 HJ 1322 239 21.8 39
Show 18242+2818 A 244 268 0.6 40
Show 18185+2749 COU1008 92 2.0 48
Show 18208+2732 BU 640 322 0.7 49
Show 18249+2817 RAO 391 313 0.1 50
Show 18173+2825 GRV 232 170 16.7 50
Show 18173+2832 LDS4782 61 48.1 52
Show 18233+2731 HO 83 115 0.8 57
Show 18253+2805 HDS2604 Aa,Ab 212 0.7 58
Show 18253+2805 HO 85 AB 196 4.9 58
Show 18257+2828 TDT 858 57 0.4 60
Show 18165+2848 KPP4098 265 2.0 68
Show 18250+2724 HO 84 DE 322 4.4 75
Show 18265+2842 HJ 1324 14 5.6 75
Show 18250+2724 STF2315 AB 117 0.6 76
Show 18250+2724 STF2315 AC 79 44.9 76
Show 18250+2724 BU 9009 AD 290 118.0 76
Show 18270+2832 MLB 648 22 10.1 79
Show 18191+2935 A 242 305 1.3 80
Show 18169+2718 MIL 4 130 16.6 81
Show 18164+2912 OSO 97 AB 100 18.6 82
Show 18164+2912 OSO 97 AC 11 21.8 82
Show 18164+2912 OSO 97 AD 273 20.3 82
Show 18271+2754 TDS 921 315 0.9 83
Show 18156+2902 KPP1398 302 10.4 85
Show 18175+2931 COU 814 229 5.3 86
Show 18273+2856 HO 433 328 9.8 89
Show 18280+2837 COU 638 136 3.3 93
Show 18265+2721 BU 264 8.0 93
Show 18176+2659 HJ 1317 141 14.7 93
Show 18170+2937 UC 238 66 48.6 94
Show 18194+2955 AG 360 169 19.1 98
Show 18139+2851 COU 637 302 3.1 101
Show 18190+2643 TDT 792 213 0.8 101
Show 18251+2654 AG 361 13 3.8 101
Show 18223+2633 TDT 819 216 0.6 108
Show 18130+2815 H 5 93 136 54.8 108
Show 18177+2642 TDT 779 169 0.5 109
Show 18259+2652 UC 3578 185 4.5 109
Show 18169+2647 A 240 349 2.4 109
Show 18178+2640 LEP 88 241 39.8 110
Show 18257+2649 DAM1237 10 10.6 110
Show 18230+3007 HDS2599 11 0.3 110
Show 18129+2800 ES 472 11 3.5 111
Show 18172+2640 A 241 288 0.7 113

 
 
WDS 18212+2820 : COMPONENTS
 
 
  A
B pa=342.8°
sep=1.63"
 
 
18212+2820 A
 
 
Componente originario normalizzato AB Name HD 168955 Coord arcsec 2000 182109.08+282003.5 Mag 9.28
Spectral class A0 (white) PmRA -9.00 PmDE -7.0 SAO 85958
HIP 89947 Tycho2 2105-00028-1 HD 168955 GC 25058
BD BD+28 2982
Tycho2
Tycho2 2105-00028-1 Pflag P RAmdeg 275.28782417 DEmdeg 28.33431577
PmRA -8.8 PmDE -7.3 E RAmdeg 9 E DEmdeg 8
E pmRA 2.6 E pmDE 2.5 EpRAm 1991.49 EpDEm 1991.60
Num 3 Q RAmdeg 0.0 Q DEmdeg 1.6 Q pmRA 0.0
Q pmDE 1.6 BTmag 9.315 E BTmag 0.017 VTmag 9.275
E VTmag 0.016 Prox 17 TYC T HIP 89947
CCDM A RAdeg 275.28788944 DEdeg 28.33422556 EpRA 1990 1.62
EpDE 1990 1.71 E RAdeg 8.6 E DEdeg 7.8 Posflg D
Corr 0.0
SAO
SAO 85958 DelFlag RA1950 PmRA1950 0
DE1950 PmDE1950 -0.007 Vmag 8.3 SpType A0
Double code Source 70 CatNum 25058 DM BD+28 2982
DMcomp BDsup HD 168955 M HD 0
GC 25058 RA1950rad 4.79610462 DE1950rad 0.49410193 PmRA2000 0.0002
PmDE2000 -0.007
Hipparcos
Catalog H HIP 89947 Proxy H RAhms 18 21 09.09
DEdms +28 20 03.2 Vmag 8.77 VarFlag R Vmag H
RAdeg 275.288 DEdeg 28.3342 AstroRef A Plx 1.58
CCDM 18212+2820 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 340 Rho 1.642 HD 168955 BD BD+28 2982
CD CP Dm number +28 2982 VIred -0.08
SpType A0 R SpType Coord arcsec 2000 182109.09+282003.2
Hipparcos 2
HIP 89947 Sn 15 So 3 Nc 2
RArad 4.8046801209 DErad 0.4945255668 Plx 2.47 PmRA -2.82
PmDE -5.72 E RArad 0.88 E DErad 1.33 E Plx 1.42
E pmRA 1.22 E pmDE 1.91 Hpmag 8.8394 E Hpmag 0.0022
SHp 0.021 VA 0 BV 0.2 E BV 0.025
VI 0.22
CCDM
Ccdm 18212+2820 RComp Comp A Note1
Note2 Discov num DRAs -2.87 DDEs 3.9
R dRAs 10 Year Theta Rho
Obs 2 Vmag 9.0 Sp A0 PmNote *
PmRA 10 PmDE -3 Dm number +28 2982 Cat1 BD
Name2 +28 1777 Cat2 AGK2/3 HD 168955 M HD
ADS BDS A11280 M ADS BDS N IDS IDS 18172N2817A
HIC 89947
 
 
18212+2820 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 182109.04+282005.1 Mag 9.91 PmRA -9.00
PmDE -7.0 Tycho2 2105-00028-2 Calc delta mag 0.63 Calc coord yes
Tycho2
Tycho2 2105-00028-2 Pflag P RAmdeg 275.28782417 DEmdeg 28.33431577
PmRA -8.8 PmDE -7.3 E RAmdeg 9 E DEmdeg 8
E pmRA 2.6 E pmDE 2.5 EpRAm 1991.49 EpDEm 1991.60
Num 3 Q RAmdeg 0.0 Q DEmdeg 1.6 Q pmRA 0.0
Q pmDE 1.6 BTmag 10.090 E BTmag 0.024 VTmag 9.914
E VTmag 0.026 Prox 17 TYC T HIP 89947
CCDM B RAdeg 275.28771889 DEdeg 28.33465861 EpRA 1990 1.62
EpDE 1990 1.73 E RAdeg 14.9 E DEdeg 13.4 Posflg D
Corr 0.0
CCDM
Ccdm 18212+2820 RComp Comp B Note1
Note2 Discov num STF2312 DRAs DDEs
R dRAs Year 1831 Theta 338 Rho 1.6
Obs 5 Vmag 10.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A11280 M ADS BDS N IDS IDS 18172N2817B
HIC 89947