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Doubles in session


Current system
18236-2610
HO 566
HD 168991


Nearby doubles
43' : 18225-2651
JKS 21AB

46' : 18265-2601
J 2212

46' : 18266-2600
J 2213

47' : 18229-2524
B 389

63' : 18277-2638
BU 133

69' : 18191-2644
B 387AB

70' : 18259-2713
RST2050

71' : 18281-2645
HDS2615AB

72' : 18280-2651
I 1366

73' : 18264-2509
J 1742

75' : 18280-2525
WFC 208
Kaus Borealis

77' : 18185-2535
J 1738

77' : 18290-2635
WNO 6

80' : 18256-2724
COO 225AB

82' : 18292-2640
B 391

82' : 18257-2726
OCC 186

84' : 18273-2503
LDS 639

92' : 18275-2725
FIN 267

96' : 18163-2559
J 2125AB

97' : 18239-2746
VVV 4

97' : 18261-2740
J 2211AB

98' : 18289-2716
OCC 185

99' : 18286-2717
J 2214

99' : 18303-2533
B 394

99' : 18253-2434
RST4010

100' : 18180-2505
OCC 669



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.

18236-2610 HO 566 (HD 168991)

 
 
18h 23m 33.28s -26° 10' 17.6" P.A. 143.00 sep 0.5 mag 7.97,9.55 Sp F8V dist. 104.28 pc (340.16 l.y.)
 
 
Coord 2000 18236-2610 Discov num HO  566 Comp Coord arcsec 2000 18 23 33.28 -26 10 17.6
Date first 1889 Date last 2016 Obs 24
Pa first 140 Pa last 143.2 P.A. Now (θ) 143.2°
Sep first 0.5 Sep last 0.543 Sep. Now (ρ) 0.543"
Mag pri 7.97 Mag sec 9.55 delta mag (ΔM) 1.58 Spectral class F8V (yellow-white)
Pri motion ra +006 Sec motion ra +006
Pri motion dec -033 Sec motion dec -033
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 168991 Constellation Sagittarius SAO 186752 HIP 90128
Tycho2 6848-02119-1 Gaia DR2 4052892326433799808 HD 168991 ADS 11296
CD CD-2613106 CP CP-26 6425 Distance 104.28 Distance ly 340.16
 
 
ORBITAL ELEMENTS
 
 
Period (P)119.87y Periastron (T)1968.65y Semi-major axis (a)0.376a
Eccentricity (e)0.784 Inclination (i)105.2° Longitude of periastron (ω)223.7°
Node (Ω)154.1° Notesn ReferenceMsn2017a
Equinox2000 Last observation2010 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 147.2 0.513
2001 146.9 0.517
2002 146.7 0.521
2003 146.4 0.524
2004 146.2 0.527
2005 145.9 0.529
2006 145.7 0.531
2007 145.4 0.533
2008 145.2 0.534
2009 144.9 0.536
2010 144.7 0.536
2011 144.4 0.537
2012 144.2 0.537
2013 144.0 0.537
2014 143.7 0.536
2015 143.5 0.536
2016 143.2 0.535
2017 143.0 0.533
2018 142.8 0.532
2019 142.5 0.530
2020 142.3 0.528
2021 142.0 0.526
2022 141.8 0.523
2023 141.5 0.520
2024 141.3 0.517
2025 141.0 0.514
2026 140.7 0.510
2027 140.5 0.506
2028 140.2 0.502
2029 139.9 0.498
2030 139.6 0.494


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


 
  


wds18236-2610a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18236-2610 HO 566 (HD 168991) : NOTES
 
 
discov_num notes refcode
HO 566 If the quadrants are correct, a revolution has been completed.
 
 
REFERENCES
 
 
refcode metd author reference
Msn2017a orb - Miles, K.N. & Mason, B.D. 2017IAUDS.191....1M
Msn2017a Inf. Circ. 191, 1, 2017
 
 
DISCOVERER
 
 
idgroup discov author
1 HO Hough, G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18236-2610 HO 566 1991 20 154 0.5 7.97 9.55 F8V NOD 182333.28-261017.6
18236-2610 HO 566 2008 22 145 0.5 7.97 9.55 F8V NOD 182333.28-261017.6
18236-2610 HO 566 2010 23 145 0.5 7.97 9.55 F8V NOD 182333.28-261017.6
18236-2610 HO 566 2016 24 143 0.5 7.97 9.55 F8V NO 182333.28-261017.6

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

 
 
WDS 18236-2610 HO 566 (HD 168991) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18236-2610 HO 566 (HD 168991) : MEASURES
 
 
No records found.

 
 
WDS 18236-2610 (HD 168991) : VIRTUAL EYEPIECE
 
 

18236-2610 HO 566A mag 7.97 Sp F8V 18236-2610 HO 566B sep 0.5 P.A. 146.10 mag 9.55 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 18236-2610 (HD 168991) : ALADIN DSS IMAGE @ 18h 23m 33.28s -26° 10' 17.6"
 
 
 
 
WDS 18236-2610 HO 566 (HD 168991) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18236-2610 HO 566 distance=1' 18225-2651 JKS 21AB distance=43' 18225-2651 JKS 21AC distance=43' 18265-2601 J 2212 distance=46' 18266-2600 J 2213 distance=46' 18229-2524 B 389 distance=47' 18277-2638 BU 133 distance=63' 18191-2644 B 387BC distance=69' 18191-2644 B 387BD distance=69' 18191-2644 B 387AB distance=69' 18259-2713 RST2050 distance=70' 18281-2645 HDS2615AB distance=71' 18281-2645 ARY 126AC distance=71' 18280-2651 I 1366 distance=72' 18264-2509 J 1742 distance=73' 18280-2525 WFC 208 (Kaus Borealis) distance=75' 18185-2535 J 1738 distance=77' 18290-2635 WNO 6 distance=77' 18256-2724 COO 225AB distance=80' 18256-2724 SIN 109AC distance=80' 18292-2640 B 391 distance=82' 18257-2726 OCC 186 distance=82' 18273-2503 LDS 639 distance=84' 18275-2725 FIN 267 distance=92' 18163-2559 J 2125AB distance=96' 18163-2559 J 2125AC distance=96' 18239-2746 VVV 4 distance=97' 18261-2740 J 2211AB distance=97' 18261-2740 J 2211AC distance=97' 18289-2716 OCC 185 distance=98' 18286-2717 J 2214 distance=99' 18303-2533 B 394 distance=99' 18253-2434 RST4010 distance=99' 18180-2505 OCC 669 distance=100' 18289-2503 H N 125AB distance=100' 18213-2433 RST4008 distance=102' 18264-2749 B 2865 distance=106' 18259-2752 RST2051 distance=106' 18307-2700 RST2059 distance=108' 18207-2754 TDT 809 distance=111' 18317-2541 OCC 264 distance=114' 18168-2500 BU 285CD distance=114' 18168-2500 BU 285CE distance=114' 18174-2730 HDS2585 distance=115' 18168-2500 BU 285AB distance=115' 18168-2500 BU 285AC distance=115' 18322-2630 SKF2066 distance=118' 18274-2420 KPP 412 distance=122' 18292-2436 B 392 distance=122' 18159-2716 J 2201AB distance=123' 18159-2716 J 2201AC distance=123' 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 18236-2610 HO 566 143 0.5 1
Show 18225-2651 JKS 21 AB 326 22.9 43
Show 18225-2651 JKS 21 AC 48 26.4 43
Show 18265-2601 J 2212 302 5.3 46
Show 18266-2600 J 2213 90 6.5 46
Show 18229-2524 B 389 223 0.3 47
Show 18277-2638 BU 133 230 0.6 63
Show 18191-2644 B 387 BC 164 0.8 69
Show 18191-2644 B 387 BD 321 4.7 69
Show 18191-2644 B 387 AB 37 8.5 69
Show 18259-2713 RST2050 77 2.0 70
Show 18281-2645 HDS2615 AB 186 0.3 71
Show 18281-2645 ARY 126 AC 135 54.1 71
Show 18280-2651 I 1366 225 0.4 72
Show 18264-2509 J 1742 233 4.6 73
Show Kaus Borealis 18280-2525 WFC 208 184 82.5 75
Show 18185-2535 J 1738 208 7.6 77
Show 18290-2635 WNO 6 182 41.8 77
Show 18256-2724 COO 225 AB 359 5.9 80
Show 18256-2724 SIN 109 AC 89 69.0 80
Show 18292-2640 B 391 65 0.2 82
Show 18257-2726 OCC 186 -1 0.1 82
Show 18273-2503 LDS 639 353 21.1 84
Show 18275-2725 FIN 267 343 4.9 92
Show 18163-2559 J 2125 AB 16 4.1 96
Show 18163-2559 J 2125 AC 175 8.9 96
Show 18239-2746 VVV 4 166 95.5 97
Show 18261-2740 J 2211 AB 49 5.7 97
Show 18261-2740 J 2211 AC 196 11.4 97
Show 18289-2716 OCC 185 -1 0.1 98
Show 18286-2717 J 2214 119 5.3 99
Show 18303-2533 B 394 197 0.2 99
Show 18253-2434 RST4010 116 0.7 99
Show 18180-2505 OCC 669 -1 0.1 100
Show 18289-2503 H N 125 AB 107 2.5 100
Show 18213-2433 RST4008 194 0.5 102
Show 18264-2749 B 2865 298 11.4 106
Show 18259-2752 RST2051 116 1.4 106
Show 18307-2700 RST2059 5 1.9 108
Show 18207-2754 TDT 809 108 0.5 111
Show 18317-2541 OCC 264 -1 0.1 114
Show 18168-2500 BU 285 CD 16 2.1 114
Show 18168-2500 BU 285 CE 113 30.0 114
Show 18174-2730 HDS2585 83 0.2 115
Show 18168-2500 BU 285 AB 313 1.6 115
Show 18168-2500 BU 285 AC 142 59.7 115
Show 18322-2630 SKF2066 282 17.5 118
Show 18274-2420 KPP 412 199 4.8 122
Show 18292-2436 B 392 208 5.2 122
Show 18159-2716 J 2201 AB 232 6.0 123
Show 18159-2716 J 2201 AC 7 11.2 123

 
 
WDS 18236-2610 : COMPONENTS
 
 
  A
B pa=146.1°
sep=0.52"
 
 
18236-2610 A
 
 
Componente originario normalizzato AB Name HD 168991 Coord arcsec 2000 182333.28-261017.6 Mag 7.97
Spectral class F8V (yellow-white) PmRA 6.00 PmDE -33.0 SAO 186752
HIP 90128 Tycho2 6848-02119-1 HD 168991 CD CD-2613106
CP CP-26 6425
Tycho2
Tycho2 6848-02119-1 Pflag RAmdeg 275.88866217 DEmdeg -26.17158003
PmRA 5.7 PmDE -32.7 E RAmdeg 5 E DEmdeg 6
E pmRA 1.6 E pmDE 1.5 EpRAm 1991.38 EpDEm 1991.24
Num 8 Q RAmdeg 1.2 Q DEmdeg 0.8 Q pmRA 1.2
Q pmDE 0.9 BTmag 8.315 E BTmag 0.017 VTmag 7.796
E VTmag 0.012 Prox 999 TYC T HIP 90128
CCDM AS RAdeg 275.88864778 DEdeg -26.17150500 EpRA 1990 1.72
EpDE 1990 1.74 E RAdeg 5.3 E DEdeg 6.4 Posflg P
Corr -0.1
SAO
SAO 186752 DelFlag RA1950 PmRA1950 0.0019
DE1950 PmDE1950 -0.047 Vmag 8.1 SpType F2
Double code Source 25 CatNum 12737 DM CD-2613106
DMcomp BDsup HD 168991 M HD 0
GC RA1950rad 4.80160352 DE1950rad -0.4572387 PmRA2000 0.0018
PmDE2000 -0.046
Hipparcos
Catalog H HIP 90128 Proxy H RAhms 18 23 33.27
DEdms -26 10 17.3 Vmag 7.69 VarFlag R Vmag G
RAdeg 275.889 DEdeg -26.1715 AstroRef A Plx 10.86
CCDM 18236-2610 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AS
Theta 149 Rho 0.463 HD 168991 BD
CD CD-2613106 CP CP-26 6425 Dm number -2613106 VIred 0.57
SpType F8V+... R SpType Coord arcsec 2000 182333.27-261017.3
Hipparcos 2
HIP 90128 Sn 15 So 3 Nc 2
RArad 4.8151649969 DErad -0.4567784507 Plx 9.59 PmRA 4.13
PmDE -32.72 E RArad 0.99 E DErad 0.65 E Plx 1.2
E pmRA 1.4 E pmDE 0.82 Hpmag 7.79 E Hpmag 0.0016
SHp 0.01 VA 0 BV 0.496 E BV 0.01
VI 0.57
CCDM
Ccdm 18236-2610 RComp Comp A Note1
Note2 Discov num DRAs -2.56 DDEs -18.3
R dRAs 41 Year Theta Rho
Obs 2 Vmag 8.4 Sp F2 PmNote *
PmRA 26 PmDE -47 Dm number -2613106 Cat1 CD
Name2 186752 Cat2 SAO HD 168991 M HD
ADS BDS A11296 M ADS BDS N IDS IDS 18173S2613A
HIC 90128
 
 
18236-2610 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 182333.30-261018.0 Mag 9.55 PmRA 6.00
PmDE -33.0 Calc delta mag 1.58 Calc coord yes
CCDM
Ccdm 18236-2610 RComp Comp B Note1
Note2 Discov num HO 566 DRAs DDEs
R dRAs Year 1952 Theta Rho 0.1
Obs 10 Vmag 8.9 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A11296 M ADS BDS N N IDS IDS 18173S2613B
HIC 90128