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Current system
11218+1811
STF 1534
HD 98736


Nearby doubles
32' : 11223+1841
LDS4090

33' : 11230+1744
BRT2410

35' : 11205+1841
TDS7797

46' : 11205+1729
KPP2044

49' : 11212+1859
SLW 590

67' : 11178+1844
BRT2409

69' : 11202+1707
HJL1062

70' : 11263+1839
ZUC 9

82' : 11234+1930
UC 2128

88' : 11157+1819
GWP1566

96' : 11272+1908
KU 38

101' : 11153+1851
GWP1564

102' : 11204+1950
LDS4084AB

102' : 11282+1859
LDS4104

107' : 11145+1823
LDS4074

110' : 11294+1749
GWP1590

118' : 11230+2007
BRT2411AB

118' : 11256+1627
HJ 4433AB

121' : 11235+2009
SLW 594

126' : 11163+1634
KPP1004

126' : 11130+1817
CVR1351

133' : 11300+1917
GWP1593

134' : 11252+1608
UC 2134AB

138' : 11263+1610
HEI 157

139' : 11246+2024
CVR 117

146' : 11321+1809
HDS1635



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.

11218+1811 STF 1534 (HD 98736)

 
 
11h 21m 49.34s +18° 11' 24.0" P.A. 314.00 sep 5.1 mag 8.08,11.14 Sp G5 dist. 31.05 pc (101.29 l.y.)
 
 
Coord 2000 11218+1811 Discov num STF1534 Comp Coord arcsec 2000 11 21 49.34 +18 11 24.0
Date first 1828 Date last 2019 Obs 85
Pa first 342 Pa last 313.5 P.A. Now (θ) 313.5°
Sep first 4.8 Sep last 5.065 Sep. Now (ρ) 5.065"
Mag pri 8.08 Mag sec 11.14 delta mag (ΔM) 3.06 Spectral class G5 (yellow)
Pri motion ra -149 Sec motion ra -151
Pri motion dec -095 Sec motion dec -096
Notes O T (Orbital solution, Parallax indicates physical)
rPM=0.012 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 98736 Constellation Leo SAO 99573 HIP 55486
Tycho2 1437-00352-1 Gaia DR2 3977050728669174912 HD 98736 GC 15608
ADS 8140 GL Gl 426A BD BD+19 2443 Distance 31.05
Distance ly 101.29
 
 
ORBITAL ELEMENTS
 
 
Period (P)1676.1789y± 600.8064 Periastron (T)1717.6181y± 409.2248 Semi-major axis (a)9.61813a± 5.46224
Eccentricity (e)0.82209± 0.13305 Inclination (i)105.502°± 7.503 Longitude of periastron (ω)95.699°± 12.085
Node (Ω)170.983°± 54.518 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 315.9 5.123
2001 315.8 5.121
2002 315.7 5.120
2003 315.5 5.118
2004 315.4 5.116
2005 315.3 5.114
2006 315.2 5.112
2007 315.1 5.110
2008 315.0 5.108
2009 314.9 5.106
2010 314.7 5.104
2011 314.6 5.102
2012 314.5 5.100
2013 314.4 5.098
2014 314.3 5.096
2015 314.2 5.094
2016 314.0 5.092
2017 313.9 5.090
2018 313.8 5.088
2019 313.7 5.086
2020 313.6 5.084
2021 313.5 5.082
2022 313.3 5.080
2023 313.2 5.078
2024 313.1 5.076
2025 313.0 5.073
2026 312.9 5.071
2027 312.8 5.069
2028 312.6 5.067
2029 312.5 5.065
2030 312.4 5.062


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


 
  


wds11218%2B1811a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 11218+1811 STF 1534 (HD 98736) : NOTES
 
 
No records found.

 
 
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.)
 
 
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
11218+1811 STF1534 1998 66 316 5.2 8.08 11.14 G5 DV 112149.34+181124.0
11218+1811 STF1534 2007 67 314 5.0 8.08 11.14 G5 DV 112149.34+181124.0
11218+1811 STF1534 2010 72 315 5.1 8.08 11.14 G5 VD 112149.34+181124.0
11218+1811 STF1534 2012 77 315 5.1 8.08 11.14 G5 V 112149.34+181124.0
11218+1811 STF1534 2016 78 314 5.2 8.08 11.14 G5 V 112149.34+181124.0
11218+1811 STF1534 2017 80 315 5.1 8.08 11.14 G5 V 112149.34+181124.0
11218+1811 STF1534 2019 84 314 5.1 8.08 11.14 G5 OV 112149.34+181124.0

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

 
 
WDS 11218+1811 STF 1534 (HD 98736) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 11218+1811 STF 1534 (HD 98736) : MEASURES
 
 
No records found.

 
 
WDS 11218+1811 (HD 98736) : VIRTUAL EYEPIECE
 
 

11218+1811 STF1534A mag 8.08 Sp G5 11218+1811 STF1534B sep 4.9 P.A. 315.00 mag 11.14 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 11218+1811 (HD 98736) : ALADIN DSS IMAGE @ 11h 21m 49.34s +18° 11' 24.0"
 
 
 
 
WDS 11218+1811 STF 1534 (HD 98736) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

11218+1811 STF1534 distance=0' 11223+1841 LDS4090 distance=32' 11230+1744 BRT2410 distance=33' 11205+1841 TDS7797 distance=35' 11205+1729 KPP2044 distance=46' 11212+1859 SLW 590 distance=49' 11178+1844 BRT2409 distance=67' 11202+1707 HJL1062 distance=69' 11263+1839 ZUC 9 distance=70' 11234+1930 UC 2128 distance=82' 11157+1819 GWP1566 distance=88' 11272+1908 KU 38 distance=96' 11153+1851 GWP1564 distance=101' 11204+1950 LDS4084AB distance=102' 11204+1950 WNO 37AC distance=102' 11282+1859 LDS4104 distance=102' 11145+1823 LDS4074 distance=107' 11182+1638 A 2379BC distance=109' 11182+1638 A 2379A,BC distance=110' 11294+1749 GWP1590 distance=110' 11230+2007 BRT2411AB distance=118' 11256+1627 HJ 4433AB distance=118' 11256+1627 SHY 224AC distance=118' 11235+2009 SLW 594 distance=121' 11163+1634 KPP1004 distance=126' 11130+1817 CVR1351 distance=126' 11300+1917 GWP1593 distance=133' 11252+1608 HEI 156BC distance=134' 11252+1608 UC 2134AB distance=134' 11263+1610 HEI 157 distance=138' 11246+2024 CVR 117 distance=139' 11321+1809 HDS1635 distance=146' 11119+1900 GWP1555 distance=150' 11323+1754 FMR 221 distance=151' 11245+2037 STF1537 distance=151' 11131+1646 COU 295 distance=152' 11265+2031 TOK 546 distance=155' 11306+1641 BRT1273 distance=155' 11201+2047 SLW 587 distance=158' 11150+1607 DEA 75 distance=159' 11323+1911 GWP1603 distance=161' 11137+2008 STF1517AB distance=164' 11137+2008 BU 1431AB,C distance=164' 11335+1838 LDS4115 distance=168' 11264+2047 LDS4098 distance=169' 11299+2017 CVR 615 distance=170' 11274+2042 OSO 41 distance=171' 11290+1555 HDS1629 distance=171' 11335+1903 GWP1607 distance=175' 11208+1515 LDS4085 distance=177' 11141+2031 STT 573AB (Zosma) distance=178' 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 11218+1811 STF1534 314 5.1
Show 11223+1841 LDS4090 38 10.2 32
Show 11230+1744 BRT2410 46 3.5 33
Show 11205+1841 TDS7797 251 6.0 35
Show 11205+1729 KPP2044 52 16.3 46
Show 11212+1859 SLW 590 303 19.8 49
Show 11178+1844 BRT2409 104 3.8 67
Show 11202+1707 HJL1062 187 103.6 69
Show 11263+1839 ZUC 9 334 1.5 70
Show 11234+1930 UC 2128 156 10.4 82
Show 11157+1819 GWP1566 180 191.0 88
Show 11272+1908 KU 38 53 6.2 96
Show 11153+1851 GWP1564 132 12.4 101
Show 11204+1950 LDS4084 AB 220 17.1 102
Show 11204+1950 WNO 37 AC 61 23.1 102
Show 11282+1859 LDS4104 47 53.6 102
Show 11145+1823 LDS4074 161 2.7 107
Show 11182+1638 A 2379 BC 288 0.4 109
Show 11182+1638 A 2379 A,BC 47 27.9 110
Show 11294+1749 GWP1590 37 72.7 110
Show 11230+2007 BRT2411 AB 316 3.1 118
Show 11256+1627 HJ 4433 AB 6 55.4 118
Show 11256+1627 SHY 224 AC 207 999.9 118
Show 11235+2009 SLW 594 63 8.1 121
Show 11163+1634 KPP1004 245 8.1 126
Show 11130+1817 CVR1351 293 3.0 126
Show 11300+1917 GWP1593 311 14.6 133
Show 11252+1608 HEI 156 BC 159 1.7 134
Show 11252+1608 UC 2134 AB 45 24.8 134
Show 11263+1610 HEI 157 157 1.6 138
Show 11246+2024 CVR 117 33 13.0 139
Show 11321+1809 HDS1635 30 0.4 146
Show 11119+1900 GWP1555 88 299.2 150
Show 11323+1754 FMR 221 151 6.2 151
Show 11245+2037 STF1537 2.0 151
Show 11131+1646 COU 295 148 0.2 152
Show 11265+2031 TOK 546 70 999.9 155
Show 11306+1641 BRT1273 196 5.3 155
Show 11201+2047 SLW 587 86 26.4 158
Show 11150+1607 DEA 75 7 18.0 159
Show 11323+1911 GWP1603 102 34.7 161
Show 11137+2008 STF1517 AB 313 0.7 164
Show 11137+2008 BU 1431 AB,C 97 246.1 164
Show 11335+1838 LDS4115 350 154.1 168
Show 11264+2047 LDS4098 245 18.4 169
Show 11299+2017 CVR 615 42 29.1 170
Show 11274+2042 OSO 41 127 21.2 171
Show 11290+1555 HDS1629 341 0.5 171
Show 11335+1903 GWP1607 91 109.7 175
Show 11208+1515 LDS4085 172 46.3 177
Show Zosma 11141+2031 STT 573 AB 341 202.7 178

 
 
WDS 11218+1811 : COMPONENTS
 
 
  A
B pa=315.0°
sep=4.93"
 
 
11218+1811 A
 
 
Componente originario normalizzato AB Name HD 98736 Coord arcsec 2000 112149.34+181124.0 Mag 8.08
Spectral class G5 (yellow) PmRA -149.00 PmDE -95.0 SAO 99573
HIP 55486 Tycho2 1437-00352-1 HD 98736 GC 15608
ADS 8140 BD BD+19 2443
Tycho2
Tycho2 1437-00352-1 Pflag RAmdeg 170.45559482 DEmdeg 18.19000372
PmRA -148.2 PmDE -93.6 E RAmdeg 8 E DEmdeg 9
E pmRA 1.0 E pmDE 1.1 EpRAm 1990.97 EpDEm 1990.78
Num 11 Q RAmdeg 0.8 Q DEmdeg 1.0 Q pmRA 0.8
Q pmDE 1.0 BTmag 9.049 E BTmag 0.022 VTmag 8.081
E VTmag 0.015 Prox 52 TYC T HIP 55486
CCDM A RAdeg 170.45594528 DEdeg 18.19021667 EpRA 1990 1.91
EpDE 1990 1.81 E RAdeg 8.0 E DEdeg 9.2 Posflg
Corr 0.2
SAO
SAO 99573 DelFlag RA1950 PmRA1950 -0.0104
DE1950 PmDE1950 -0.104 Vmag 8.1 SpType G5
Double code Source 70 CatNum 15608 DM BD+19 2443
DMcomp BDsup HD 98736 M HD 0
GC 15608 RA1950rad 2.96359356 DE1950rad 0.32228324 PmRA2000 -0.0104
PmDE2000 -0.098
Hipparcos
Catalog H HIP 55486 Proxy H RAhms 11 21 49.44
DEdms +18 11 24.8 Vmag 7.93 VarFlag R Vmag G
RAdeg 170.456 DEdeg 18.1902 AstroRef A Plx 31.68
CCDM 11218+1811 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual B M HIP AB
Theta 317 Rho 5.166 HD 98736 BD BD+19 2443
CD CP Dm number +19 2443 VIred 0.9
SpType K6+... R SpType Coord arcsec 2000 112149.44+181124.8
Hipparcos 2
HIP 55486 Sn 15 So 3 Nc 2
RArad 2.9750180793 DErad 0.3174794489 Plx 32.21 PmRA -149.88
PmDE -92.98 E RArad 1.13 E DErad 0.7 E Plx 0.91
E pmRA 1.25 E pmDE 0.86 Hpmag 8.0663 E Hpmag 0.0019
SHp 0.011 VA 0 BV 0.894 E BV 0.005
VI 0.94
CCDM
Ccdm 11218+1811 RComp Comp A Note1
Note2 Discov num DRAs 1.31 DDEs 23.2
R dRAs 10 Year Theta Rho
Obs 2 Vmag 8.2 Sp G5 PmNote *
PmRA -154 PmDE -108 Dm number +19 2443 Cat1 BD
Name2 +18 1116 Cat2 AGK2/3 HD 98736 M HD
ADS BDS A 8140 M ADS BDS N IDS IDS 11166N1844A
HIC 55486
 
 
11218+1811 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 112149.10+181127.5 Mag 11.14 PmRA -151.00
PmDE -96.0 Calc delta mag 3.06 Calc coord yes
CCDM
Ccdm 11218+1811 RComp Comp B Note1
Note2 Discov num STF1534 DRAs DDEs
R dRAs Year 1955 Theta 321 Rho 5.2
Obs 25 Vmag 11.4 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A 8140 M ADS BDS N IDS IDS 11166N1844B
HIC 55486