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Doubles in session


Current system
18191-3509
OL 18
HD 167981


Nearby doubles
10' : 18185-3503
OL 17

16' : 18202-3517
RST3174

22' : 18203-3526
TOK 801

23' : 18188-3448
RST3171

25' : 18187-3534
LDS 636

30' : 18185-3441
TOK 902

32' : 18180-3538
B 425AB

34' : 18176-3442
BRT1766

37' : 18221-3507
BRT1772

38' : 18167-3447
VVV 53

49' : 18206-3424
JSP 773

50' : 18155-3532
BRT1763

53' : 18205-3420
JSP 939

54' : 18202-3601
BRT1769

56' : 18150-3448
BRT1761

61' : 18240-3516
BRT1773

62' : 18142-3525
B 424AB

66' : 18176-3406
HJ 5036AB

69' : 18246-3523
JSP 774

72' : 18243-3539
BRT1774

73' : 18153-3413
BRT1762

73' : 18190-3357
BRT1768

74' : 18241-3430
TDT 835

75' : 18248-3535
BRT3331

77' : 18129-3513
SLR 13

78' : 18239-3421
ARY 76



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.

18191-3509 OL 18 (HD 167981)

 
 
18h 19m 05.58s -35° 09' 24.6" P.A. 296.00 sep 1.1 mag 9.17,9.73 Sp K3V dist. 31.9 pc (104.06 l.y.)
 
 
Coord 2000 18191-3509 Discov num OL   18 Comp Coord arcsec 2000 18 19 05.58 -35 09 24.6
Date first 1909 Date last 2021 Obs 36
Pa first 120 Pa last 295.9 P.A. Now (θ) 295.9°
Sep first 1.9 Sep last 1.073 Sep. Now (ρ) 1.073"
Mag pri 9.17 Mag sec 9.73 delta mag (ΔM) 0.56 Spectral class K3V (yellow-orange)
Pri motion ra -064 Sec motion ra
Pri motion dec -031 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 167981 Constellation Sagittarius HIP 89766 Tycho2 7401-01085-1
Gaia DR2 4038318261054205824 HD 167981 CD CD-3512482 CP CP-35 7881
Distance 31.9 Distance ly 104.06
 
 
ORBITAL ELEMENTS
 
 
Period (P)319.4y Periastron (T)2045.22y Semi-major axis (a)1.746a
Eccentricity (e)0.283 Inclination (i)86.6° Longitude of periastron (ω)190°
Node (Ω)118.6° Notes ReferenceTok2021c
Equinox2000 Last observation2021 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 288.4 0.492
2001 289.2 0.524
2002 289.9 0.555
2003 290.5 0.586
2004 291.0 0.617
2005 291.5 0.647
2006 291.9 0.677
2007 292.4 0.706
2008 292.7 0.736
2009 293.1 0.764
2010 293.4 0.793
2011 293.7 0.820
2012 294.0 0.847
2013 294.2 0.874
2014 294.5 0.900
2015 294.7 0.925
2016 295.0 0.950
2017 295.2 0.974
2018 295.4 0.997
2019 295.6 1.019
2020 295.7 1.041
2021 295.9 1.062
2022 296.1 1.082
2023 296.3 1.101
2024 296.4 1.119
2025 296.6 1.136
2026 296.7 1.152
2027 296.9 1.167
2028 297.0 1.181
2029 297.1 1.194
2030 297.3 1.205


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


 
  


wds18191-3509a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18191-3509 OL 18 (HD 167981) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Tok2021c orb - Tokovinin, A. 2021IAUDS.203....1S
Tok2021c Inf. Circ. 203, 1, 2021
 
 
DISCOVERER
 
 
idgroup discov author
1 OL Olivier, C.P.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18191-3509 OL 18 1991 12 275 0.2 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2009 14 293 0.8 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2014 16 295 0.9 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2015 20 295 0.9 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2017 23 295 1.0 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2018 27 295 1.0 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2019 29 296 1.0 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2020 32 296 1.1 9.17 9.73 K3V 181905.58-350924.6
18191-3509 OL 18 2021 36 296 1.1 9.17 9.73 K3V O 181905.58-350924.6

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

 
 
WDS 18191-3509 OL 18 (HD 167981) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18191-3509 OL 18 (HD 167981) : MEASURES
 
 
No records found.

 
 
WDS 18191-3509 (HD 167981) : VIRTUAL EYEPIECE
 
 

18191-3509 OL 18A mag 9.17 Sp K3V 18191-3509 OL 18B sep 0.9 P.A. 300.70 mag 9.73 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 18191-3509 (HD 167981) : ALADIN DSS IMAGE @ 18h 19m 05.58s -35° 09' 24.6"
 
 
 
 
WDS 18191-3509 OL 18 (HD 167981) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18191-3509 OL 18 distance=1' 18185-3503 OL 17 distance=10' 18202-3517 RST3174 distance=16' 18203-3526 TOK 801 distance=22' 18188-3448 RST3171 distance=23' 18187-3534 LDS 636 distance=25' 18185-3441 TOK 902 distance=30' 18180-3538 B 425AB distance=32' 18180-3538 B 425AC distance=32' 18176-3442 BRT1766 distance=34' 18221-3507 BRT1772 distance=37' 18167-3447 VVV 53 distance=38' 18206-3424 JSP 773 distance=49' 18155-3532 BRT1763 distance=50' 18205-3420 JSP 939 distance=53' 18202-3601 BRT1769 distance=54' 18150-3448 BRT1761 distance=56' 18240-3516 BRT1773 distance=61' 18142-3525 B 424CD distance=62' 18142-3525 B 424AB distance=62' 18142-3525 B 424AC distance=62' 18176-3406 HJ 5036AB distance=66' 18176-3406 HJ 5036AC distance=66' 18176-3406 HJ 5036CD distance=67' 18246-3523 JSP 774 distance=69' 18243-3539 BRT1774 distance=72' 18153-3413 BRT1762 distance=73' 18190-3357 BRT1768 distance=73' 18241-3430 TDT 835 distance=74' 18248-3535 BRT3331 distance=75' 18129-3513 SLR 13 distance=77' 18239-3421 ARY 76 distance=78' 18242-3423 SEE 351AB (Kaus Australis) distance=78' 18242-3423 GOL 2AC (Kaus Australis) distance=78' 18242-3423 TOK 617AD (Kaus Australis) distance=78' 18233-3408 VVV 56 distance=81' 18248-3424 SKF2065 distance=84' 18136-3416 JSP 938AB distance=87' 18136-3416 SIN 107AC distance=87' 18127-3433 RST3162 distance=87' 18153-3623 B 1354AC distance=88' 18153-3623 B 1354AB distance=88' 18156-3633 RST3165 distance=94' 18268-3517 B 2866 distance=95' 18126-3417 JSP 771 distance=96' 18176-3646 BU 760AB distance=98' 18176-3646 BU 760AC distance=98' 18176-3646 BU 760AD distance=98' 18207-3647 B 1356 distance=99' 18213-3333 B 937 distance=100' 18244-3349 BRT1775 distance=103' 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 18191-3509 OL 18 296 1.1 1
Show 18185-3503 OL 17 252 6.1 10
Show 18202-3517 RST3174 306 1.5 16
Show 18203-3526 TOK 801 7 0.1 22
Show 18188-3448 RST3171 234 1.1 23
Show 18187-3534 LDS 636 6 20.8 25
Show 18185-3441 TOK 902 29 0.2 30
Show 18180-3538 B 425 AB 51 2.9 32
Show 18180-3538 B 425 AC 356 7.3 32
Show 18176-3442 BRT1766 261 2.4 34
Show 18221-3507 BRT1772 195 2.8 37
Show 18167-3447 VVV 53 8 4.5 38
Show 18206-3424 JSP 773 337 1.0 49
Show 18155-3532 BRT1763 224 3.2 50
Show 18205-3420 JSP 939 27 3.3 53
Show 18202-3601 BRT1769 1 4.1 54
Show 18150-3448 BRT1761 145 3.8 56
Show 18240-3516 BRT1773 295 3.6 61
Show 18142-3525 B 424 CD 41 2.8 62
Show 18142-3525 B 424 AB 82 1.0 62
Show 18142-3525 B 424 AC 143 42.5 62
Show 18176-3406 HJ 5036 AB 85 38.7 66
Show 18176-3406 HJ 5036 AC 41 93.8 66
Show 18176-3406 HJ 5036 CD 346 22.4 67
Show 18246-3523 JSP 774 72 4.3 69
Show 18243-3539 BRT1774 55 3.5 72
Show 18153-3413 BRT1762 13 4.8 73
Show 18190-3357 BRT1768 72 4.3 73
Show 18241-3430 TDT 835 76 0.6 74
Show 18248-3535 BRT3331 192 5.5 75
Show 18129-3513 SLR 13 47 2.4 77
Show 18239-3421 ARY 76 10 18.9 78
Show Kaus Australis 18242-3423 SEE 351 AB 314 39.9 78
Show Kaus Australis 18242-3423 GOL 2 AC 142 2.4 78
Show Kaus Australis 18242-3423 TOK 617 AD 36 862.9 78
Show 18233-3408 VVV 56 193 17.3 81
Show 18248-3424 SKF2065 164 23.3 84
Show 18136-3416 JSP 938 AB 149 6.1 87
Show 18136-3416 SIN 107 AC 55 25.4 87
Show 18127-3433 RST3162 206 0.3 87
Show 18153-3623 B 1354 AC 308 16.2 88
Show 18153-3623 B 1354 AB 175 4.8 88
Show 18156-3633 RST3165 4 0.2 94
Show 18268-3517 B 2866 343 4.5 95
Show 18126-3417 JSP 771 304 2.9 96
Show 18176-3646 BU 760 AB 110 3.5 98
Show 18176-3646 BU 760 AC 320 28.3 98
Show 18176-3646 BU 760 AD 318 93.8 98
Show 18207-3647 B 1356 228 2.5 99
Show 18213-3333 B 937 142 0.8 100
Show 18244-3349 BRT1775 147 3.2 103

 
 
WDS 18191-3509 : COMPONENTS
 
 
  A
B pa=300.7°
sep=0.92"
 
 
18191-3509 A
 
 
Componente originario normalizzato AB Name HD 167981 Coord arcsec 2000 181905.58-350924.6 Mag 9.17
Spectral class K3V (yellow-orange) PmRA -64.00 PmDE -31.0 HIP 89766
Tycho2 7401-01085-1 HD 167981 CD CD-3512482 CP CP-35 7881
Tycho2
Tycho2 7401-01085-1 Pflag RAmdeg 274.77306209 DEmdeg -35.15688663
PmRA -60.1 PmDE -21.3 E RAmdeg 10 E DEmdeg 12
E pmRA 1.5 E pmDE 1.5 EpRAm 1990.33 EpDEm 1989.76
Num 4 Q RAmdeg 0.6 Q DEmdeg 0.3 Q pmRA 0.6
Q pmDE 0.3 BTmag 9.852 E BTmag 0.027 VTmag 8.662
E VTmag 0.016 Prox 520 TYC T HIP 89766
CCDM AB RAdeg 274.77323194 DEdeg -35.15683750 EpRA 1990 1.69
EpDE 1990 1.69 E RAdeg 10.3 E DEdeg 12.4 Posflg P
Corr 0.0
Hipparcos
Catalog H HIP 89766 Proxy H RAhms 18 19 05.58
DEdms -35 09 24.6 Vmag 8.51 VarFlag R Vmag H
RAdeg 274.773 DEdeg -35.1568 AstroRef * Plx 30.65
CCDM 18191-3509 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 275 Rho 0.227 HD 167981 BD
CD CD-3512482 CP CP-35 7881 Dm number -3512482 VIred 1.03
SpType K3V R SpType Coord arcsec 2000 181905.58-350924.6
Hipparcos 2
HIP 89766 Sn 55 So 3 Nc 2
RArad 4.795697838 DErad -0.6136024839 Plx 31.35 PmRA -59.05
PmDE -21.44 E RArad 1.12 E DErad 0.79 E Plx 1.25
E pmRA 1.64 E pmDE 1.02 Hpmag 8.6578 E Hpmag 0.0019
SHp 0.015 VA 0 BV 1.013 E BV 0.025
VI 0.99
CCDM
Ccdm 18191-3509 RComp Comp A Note1
Note2 Discov num DRAs -0.19 DDEs -25.5
R dRAs 41 Year Theta Rho
Obs 2 Vmag 9.2 Sp K2 PmNote
PmRA PmDE Dm number -3512482 Cat1 CD
Name2 Cat2 HD 167981 M HD
ADS BDS M ADS BDS N IDS IDS 18124S3512A
HIC 89766
 
 
18191-3509 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 181905.52-350924.1 Mag 9.73 Calc delta mag 0.56
Calc coord yes
CCDM
Ccdm 18191-3509 RComp Comp B Note1
Note2 Discov num OL 18 DRAs DDEs
R dRAs Year 1959 Theta 125 Rho 0.7
Obs 8 Vmag 9.8 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 18124S3512B
HIC 89766