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Doubles in session


Current system
18320+0647
STT 354
HD 170987


Nearby doubles
7' : 18318+0641
J 1372

15' : 18327+0656
SLE 352

16' : 18310+0648
SLE 349AB

17' : 18331+0649
SLE 354

18' : 18330+0637
J 96

19' : 18328+0633
SLE 353

22' : 18314+0628
STF2329

30' : 18310+0712
TDT 924

39' : 18341+0624
SLE 355

39' : 18299+0708
SLE 348

41' : 18299+0711
SLE 347

43' : 18318+0729
SLE 350

45' : 18335+0726
SCJ 18AB

46' : 18297+0616
GWP2779

51' : 18354+0649
J 100

52' : 18295+0722
A 582

60' : 18282+0705
TDS 924

63' : 18279+0650
SLE 344

63' : 18281+0709
J 95AB

63' : 18314+0545
TDT 925

64' : 18361+0701
LDS5238

65' : 18350+0559
GWP2788

66' : 18280+0620
TDT 895

66' : 18277+0631
TDT 888

66' : 18349+0556
TDT 945AB

67' : 18280+0618
TDS 923



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.

18320+0647 STT 354 (HD 170987)

 
 
18h 32m 01.73s +06° 46' 48.4" P.A. 205.00 sep 0.5 mag 7.84,8.91 Sp F5.6V+F5V dist. 89.37 pc (291.52 l.y.)
 
 
Coord 2000 18320+0647 Discov num STT 354 Comp Coord arcsec 2000 18 32 01.73 +06 46 48.4
Date first 1843 Date last 2021 Obs 115
Pa first 150 Pa last 204.8 P.A. Now (θ) 204.8°
Sep first 0.7 Sep last 0.501 Sep. Now (ρ) 0.501"
Mag pri 7.84 Mag sec 8.91 delta mag (ΔM) 1.07 Spectral class F5.6V+F5V (yellow-white/yellow-white)
Pri motion ra -027 Sec motion ra -027
Pri motion dec -081 Sec motion dec -081
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 170987 Constellation Ophiuchus SAO 123609 HIP 90851
Tycho2 0458-00606-1 Gaia DR2 4285137563278292864 HD 170987 ADS 11432
BD BD+06 3829 Distance 89.37 Distance ly 291.52
 
 
ORBITAL ELEMENTS
 
 
Period (P)426y Periastron (T)1783.9y Semi-major axis (a)0.801a
Eccentricity (e)0.504 Inclination (i)63.6° Longitude of periastron (ω)252°
Node (Ω)149.7° Notes ReferenceZir2013a
Equinox2000 Last observation2009 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 205.2 0.622
2001 205.7 0.619
2002 206.3 0.616
2003 206.8 0.613
2004 207.4 0.610
2005 207.9 0.607
2006 208.5 0.604
2007 209.1 0.601
2008 209.7 0.598
2009 210.3 0.595
2010 210.8 0.592
2011 211.4 0.590
2012 212.0 0.587
2013 212.7 0.584
2014 213.3 0.581
2015 213.9 0.579
2016 214.5 0.576
2017 215.1 0.573
2018 215.8 0.571
2019 216.4 0.568
2020 217.1 0.566
2021 217.7 0.563
2022 218.4 0.561
2023 219.0 0.558
2024 219.7 0.556
2025 220.4 0.554
2026 221.1 0.551
2027 221.8 0.549
2028 222.5 0.547
2029 223.2 0.545
2030 223.9 0.543


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


 
  


wds18320%2B0647a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18320+0647 STT 354 (HD 170987) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Zir2013a orb - Zirm, H. 2013IAUDS.179....1Z
Zir2013a Inf. Circ. 179, 1, 2013
 
 
DISCOVERER
 
 
idgroup discov author
1 STT Struve, O.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18320+0647 STT 354 2007 110 208 0.6 7.84 8.91 F5V D 183201.73+064648.4
18320+0647 STT 354 2009 114 212 0.6 7.84 8.91 F5V D 183201.73+064648.4
18320+0647 STT 354 2011 116 212 0.6 7.84 8.91 F5V O 183201.73+064648.4
18320+0647 STT 354 2013 108 215 0.6 7.84 8.91 F5V O 183201.73+064648.4
18320+0647 STT 354 2018 109 218 0.5 7.84 8.91 F5V O 183201.73+064648.4
18320+0647 STT 354 2021 115 205 0.5 7.84 8.91 F5.6V+F5V O 183201.73+064648.4

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

 
 
WDS 18320+0647 STT 354 (HD 170987) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18320+0647 STT 354 (HD 170987) : MEASURES
 
 
No records found.

 
 
WDS 18320+0647 (HD 170987) : VIRTUAL EYEPIECE
 
 

18320+0647 STT 354A mag 7.84 Sp F5.6V 18320+0647 STT 354B sep 0.5 P.A. 204.60 mag 8.91 Sp F5V 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 18320+0647 (HD 170987) : ALADIN DSS IMAGE @ 18h 32m 01.73s +06° 46' 48.4"
 
 
 
 
WDS 18320+0647 STT 354 (HD 170987) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18320+0647 STT 354 distance=1' 18318+0641 J 1372 distance=7' 18327+0656 SLE 352 distance=15' 18310+0648 SLE 349AB distance=16' 18310+0648 SLE 349AC distance=16' 18310+0648 SLE 349BC distance=16' 18331+0649 SLE 354 distance=17' 18330+0637 J 96 distance=18' 18328+0633 SLE 353 distance=19' 18314+0628 STF2329 distance=22' 18310+0712 TDT 924 distance=30' 18341+0624 SLE 355 distance=39' 18299+0708 SLE 348 distance=39' 18299+0711 SLE 347 distance=41' 18318+0729 SLE 350 distance=43' 18335+0726 SCJ 18AB distance=45' 18335+0726 SLE 690AC distance=45' 18335+0726 SCJ 18AD distance=45' 18297+0616 GWP2779 distance=46' 18316+0732 J 1149BC distance=46' 18354+0649 J 100 distance=51' 18295+0722 A 582 distance=52' 18282+0705 TDS 924 distance=60' 18279+0650 SLE 344 distance=63' 18281+0709 J 95AB distance=63' 18281+0709 J 95AC distance=63' 18281+0709 SLE 346AD distance=63' 18314+0545 TDT 925 distance=63' 18361+0701 LDS5238 distance=64' 18350+0559 GWP2788 distance=65' 18280+0620 TDT 895 distance=66' 18277+0631 TDT 888 distance=66' 18349+0556 TDT 945AB distance=66' 18349+0556 GII 66AC distance=66' 18280+0618 TDS 923 distance=67' 18281+0720 SLE 345 distance=68' 18276+0633 BU 464AB distance=68' 18276+0633 BU 464AC distance=68' 18367+0640 CHR 76Aa,Ab distance=70' 18367+0640 J 99AB distance=70' 18367+0640 J 99AC distance=70' 18367+0640 SLE 497AD distance=70' 18367+0640 SLE 497AE distance=70' 18329+0539 SLE 495 distance=70' 18349+0742 SLE 357AB distance=70' 18349+0742 SLE 357AC distance=70' 18349+0742 SLE 357BC distance=70' 18280+0612 CHR 71 distance=70' 18274+0624 GII 68 distance=73' 18272+0629 TDT 878 distance=74' 18314+0802 HDS2627 distance=76' 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 18320+0647 STT 354 205 0.5 1
Show 18318+0641 J 1372 118 5.2 7
Show 18327+0656 SLE 352 274 9.5 15
Show 18310+0648 SLE 349 AB 355 20.8 16
Show 18310+0648 SLE 349 AC 12 20.2 16
Show 18310+0648 SLE 349 BC 103 6.5 16
Show 18331+0649 SLE 354 343 7.8 17
Show 18330+0637 J 96 148 3.2 18
Show 18328+0633 SLE 353 58 12.2 19
Show 18314+0628 STF2329 42 4.3 22
Show 18310+0712 TDT 924 138 0.6 30
Show 18341+0624 SLE 355 77 14.7 39
Show 18299+0708 SLE 348 185 15.1 39
Show 18299+0711 SLE 347 191 15.7 41
Show 18318+0729 SLE 350 144 16.8 43
Show 18335+0726 SCJ 18 AB 196 46.0 45
Show 18335+0726 SLE 690 AC 304 87.5 45
Show 18335+0726 SCJ 18 AD 119 16.9 45
Show 18297+0616 GWP2779 88 36.9 46
Show 18316+0732 J 1149 BC 200 2.6 46
Show 18354+0649 J 100 102 4.1 51
Show 18295+0722 A 582 29 2.9 52
Show 18282+0705 TDS 924 163 2.3 60
Show 18279+0650 SLE 344 133 11.7 63
Show 18281+0709 J 95 AB 123 2.2 63
Show 18281+0709 J 95 AC 32 32.0 63
Show 18281+0709 SLE 346 AD 185 70.8 63
Show 18314+0545 TDT 925 241 0.6 63
Show 18361+0701 LDS5238 342 6.0 64
Show 18350+0559 GWP2788 222 21.9 65
Show 18280+0620 TDT 895 226 1.8 66
Show 18277+0631 TDT 888 86 0.7 66
Show 18349+0556 TDT 945 AB 226 0.5 66
Show 18349+0556 GII 66 AC 133 3.1 66
Show 18280+0618 TDS 923 7 1.7 67
Show 18281+0720 SLE 345 38 11.1 68
Show 18276+0633 BU 464 AB 105 1.1 68
Show 18276+0633 BU 464 AC 86 25.9 68
Show 18367+0640 CHR 76 Aa,Ab 91 0.2 70
Show 18367+0640 J 99 AB 337 35.9 70
Show 18367+0640 J 99 AC 78 77.6 70
Show 18367+0640 SLE 497 AD 243 117.3 70
Show 18367+0640 SLE 497 AE 209 263.3 70
Show 18329+0539 SLE 495 99 8.5 70
Show 18349+0742 SLE 357 AB 327 8.1 70
Show 18349+0742 SLE 357 AC 308 14.6 70
Show 18349+0742 SLE 357 BC 287 7.4 70
Show 18280+0612 CHR 71 16 0.0 70
Show 18274+0624 GII 68 27 2.3 73
Show 18272+0629 TDT 878 126 2.6 74
Show 18314+0802 HDS2627 211 0.5 76

 
 
WDS 18320+0647 : COMPONENTS
 
 
  A
B pa=204.6°
sep=0.50"
 
 
18320+0647 A
 
 
Componente originario normalizzato AB Name HD 170987 Coord arcsec 2000 183201.73+064648.4 Mag 7.84
Spectral class F5.6V (yellow-white) PmRA -27.00 PmDE -81.0 SAO 123609
HIP 90851 Tycho2 0458-00606-1 HD 170987 ADS 11432
BD BD+06 3829
Tycho2
Tycho2 0458-00606-1 Pflag RAmdeg 278.00720463 DEmdeg 6.78007300
PmRA -26.7 PmDE -80.6 E RAmdeg 5 E DEmdeg 5
E pmRA 1.3 E pmDE 1.3 EpRAm 1991.52 EpDEm 1991.47
Num 11 Q RAmdeg 0.6 Q DEmdeg 1.0 Q pmRA 0.7
Q pmDE 1.1 BTmag 8.072 E BTmag 0.015 VTmag 7.598
E VTmag 0.011 Prox 999 TYC T HIP 90851
CCDM AB RAdeg 278.00726556 DEdeg 6.78025722 EpRA 1990 1.85
EpDE 1990 1.77 E RAdeg 4.6 E DEdeg 5.2 Posflg P
Corr -0.3
SAO
SAO 123609 DelFlag RA1950 PmRA1950 -0.0028
DE1950 PmDE1950 -0.081 Vmag 7.1 SpType F5
Double code Source 32 CatNum 8598 DM BD+06 3829
DMcomp BDsup HD 170987 M HD 0
GC RA1950rad 4.84153376 DE1950rad 0.11770104 PmRA2000 -0.0026
PmDE2000 -0.082
Hipparcos
Catalog H HIP 90851 Proxy H RAhms 18 32 01.75
DEdms +06 46 49.1 Vmag 7.46 VarFlag R Vmag G
RAdeg 278.007 DEdeg 6.78031 AstroRef A Plx 10.75
CCDM 18320+0647 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 201 Rho 0.658 HD 170987 BD BD+06 3829
CD CP Dm number +06 3829 VIred 0.56
SpType F5 R SpType Coord arcsec 2000 183201.75+064649.1
Hipparcos 2
HIP 90851 Sn 15 So 3 Nc 2
RArad 4.8521424462 DErad 0.1183387242 Plx 11.19 PmRA -28.42
PmDE -86.6 E RArad 1.04 E DErad 0.88 E Plx 1.02
E pmRA 1.12 E pmDE 1.05 Hpmag 7.5549 E Hpmag 0.001
SHp 0.008 VA 0 BV 0.486 E BV 0.015
VI 0.56
CCDM
Ccdm 18320+0647 RComp Comp A Note1
Note2 Discov num DRAs 1.72 DDEs -12.0
R dRAs 10 Year Theta Rho
Obs 2 Vmag 7.7 Sp F5 PmNote *
PmRA -29 PmDE -84 Dm number +06 3829 Cat1 BD
Name2 +06 2285 Cat2 AGK2/3 HD 170987 M HD
ADS BDS A11432 M ADS BDS N IDS IDS 18272N0643A
HIC 90851
 
 
18320+0647 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 183201.72+064647.9 Mag 8.91 Spectral class F5V (yellow-white)
PmRA -27.00 PmDE -81.0 Calc delta mag 1.07 Calc coord yes
CCDM
Ccdm 18320+0647 RComp Comp B Note1
Note2 Discov num STT 354 DRAs DDEs
R dRAs Year 1960 Theta 190 Rho 0.7
Obs 99 Vmag 8.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A11432 M ADS BDS N IDS IDS 18272N0643B
HIC 90851