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Current system
11279-0142
RST 4944
HD 99651


Nearby doubles
14' : 11280-0155
STF3071

27' : 11293-0127
K2 3

27' : 11294-0157
SLW 608

28' : 11281-0209
SLW 603

36' : 11257-0127
GWP1584

39' : 11290-0117
GRV1056

50' : 11249-0205
EPI 5

51' : 11246-0156
BAL 536

56' : 11244-0158
BAL 535

56' : 11242-0144
SLW 596

57' : 11296-0233
KPP3847

59' : 11265-0237
CBL 603

65' : 11295-0243
GWP1591

82' : 11245-0246
SLW 597

92' : 11218-0144
STF3069

99' : 11216-0211
RST4943

102' : 11304-0316
GWP1595

103' : 11214-0212
CVR 606

104' : 11228-0252
BAL 216

111' : 11286+0007
UC 2148

112' : 11273-0333
RST4478

112' : 11206-0208
UC 2120

118' : 11310-0006
SLW 611

120' : 11314-0329
SLW 612

120' : 11358-0151
BAL 537

121' : 11287-0018
UC 2149



Selections
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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.

11279-0142 RST 4944 (HD 99651)

 
 
11h 27m 53.73s -01° 41' 59.8" P.A. 182.00 sep 0.1 mag 6.62,8.22 Sp gK2 dist. 161.03 pc (525.28 l.y.)
 
 
Coord 2000 11279-0142 Discov num RST4944 Comp Coord arcsec 2000 11 27 53.73 -01 41 59.8
Date first 1943 Date last 2021 Obs 34
Pa first 331 Pa last 182.4 P.A. Now (θ) 167.9°
Sep first 0.3 Sep last 0.099 Sep. Now (ρ) 0.086"
Mag pri 6.62 Mag sec 8.22 delta mag (ΔM) 1.6 Spectral class gK2
Pri motion ra -034 Sec motion ra
Pri motion dec +000 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 99651 Constellation Leo SAO 138216 HIP 55941
Tycho2 4923-00979-1 Gaia DR2 3796597059252894848 HD 99651 HR 4419
GC 15728 BD BD-00 2442 Distance 161.03 Distance ly 525.28
 
 
ORBITAL ELEMENTS
 
 
Period (P)120.5y± 18.9 Periastron (T)2025.58y± 0.42 Semi-major axis (a)0.215a± 0.012
Eccentricity (e)0.64± 0.05 Inclination (i)134.8°± 6.5 Longitude of periastron (ω)51.7°± 6.2
Node (Ω)174.4°± 5.6 Notes ReferenceTok2021f
Equinox Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 267.8 0.186
2001 265.6 0.182
2002 263.3 0.178
2003 260.9 0.174
2004 258.4 0.170
2005 255.7 0.166
2006 252.9 0.162
2007 250.0 0.158
2008 246.9 0.154
2009 243.6 0.150
2010 240.2 0.146
2011 236.6 0.142
2012 232.8 0.138
2013 228.8 0.134
2014 224.5 0.131
2015 220.0 0.127
2016 215.2 0.123
2017 210.1 0.119
2018 204.7 0.115
2019 198.8 0.110
2020 192.4 0.105
2021 185.2 0.100
2022 177.2 0.093
2023 167.9 0.086
2024 156.6 0.077
2025 142.5 0.069
2026 124.7 0.062
2027 103.5 0.058
2028 81.8 0.060
2029 63.1 0.067
2030 48.6 0.078


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


 
  


wds11279-0142c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 11279-0142 RST 4944 (HD 99651) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Tok2021f orb - Tokovinin, A. 2021IAUDS.204....1T
Tok2021f Inf. Circ. 204, 1, 2021
 
 
DISCOVERER
 
 
idgroup discov author
1 RST Rossiter, R.A.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
11279-0142 RST4944 2006 26 252 0.2 6.62 8.22 gK2 O 112753.73-014159.8
11279-0142 RST4944 2009 28 242 0.1 6.62 8.22 gK2 O 112753.73-014159.8
11279-0142 RST4944 2013 29 228 0.1 6.62 8.22 gK2 O 112753.73-014159.8
11279-0142 RST4944 2018 31 202 0.1 6.62 8.22 gK2 O 112753.73-014159.8
11279-0142 RST4944 2019 32 192 0.1 6.62 8.22 gK2 O 112753.73-014159.8
11279-0142 RST4944 2021 34 182 0.1 6.62 8.22 gK2 O 112753.73-014159.8

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

 
 
WDS 11279-0142 RST 4944 (HD 99651) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 11279-0142 RST 4944 (HD 99651) : MEASURES
 
 
No records found.

 
 
WDS 11279-0142 (HD 99651) : VIRTUAL EYEPIECE
 
 

11279-0142 RST4944A mag 6.62 Sp gK2 11279-0142 RST4944B sep 0.1 P.A. 182.40 mag 8.22 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 11279-0142 (HD 99651) : ALADIN DSS IMAGE @ 11h 27m 53.73s -01° 41' 59.8"
 
 
 
 
WDS 11279-0142 RST 4944 (HD 99651) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

11279-0142 RST4944 distance=0' 11280-0155 STF3071 distance=14' 11293-0127 K2 3 distance=27' 11294-0157 SLW 608 distance=27' 11281-0209 SLW 603 distance=28' 11257-0127 GWP1584 distance=36' 11290-0117 GRV1056 distance=39' 11249-0205 EPI 5 distance=50' 11246-0156 BAL 536 distance=51' 11244-0158 BAL 535 distance=56' 11242-0144 SLW 596 distance=56' 11296-0233 KPP3847 distance=57' 11265-0237 CBL 603 distance=59' 11295-0243 GWP1591 distance=65' 11245-0246 SLW 597 distance=82' 11218-0144 STF3069 distance=92' 11216-0211 RST4943 distance=99' 11304-0316 GWP1595 distance=102' 11214-0212 CVR 606 distance=103' 11228-0252 BAL 216 distance=104' 11286+0007 UC 2148 distance=111' 11273-0333 RST4478 distance=112' 11206-0208 UC 2120 distance=112' 11310-0006 SLW 611 distance=118' 11314-0329 SLW 612 distance=120' 11358-0151 BAL 537 distance=120' 11287-0018 UC 2149 distance=121' 11197-0125 LDS4083 distance=123' 11360-0124 GRV1058 distance=124' 11294-0343 A 6AB distance=124' 11321-0332 STF1548A,BC distance=127' 11321-0332 RST4480BC distance=127' 11194-0139 STF1529 distance=128' 11362-0223 RST4946 distance=132' 11326-0008 SLW 614 distance=132' 11205-0254 BAL 215 distance=132' 11360-0231 EPI 8AB distance=132' 11360-0231 K2 44AC distance=132' 11187-0150 CVR 602 distance=138' 11323-0025 TOK 142 distance=144' 11292+0040 BAL1448 distance=144' 11201-0318 CVR 603 distance=152' 11380-0136 LDS4125AB distance=152' 11380-0136 TOK 548AC distance=152' 11321+0038 LDS4112 distance=154' 11344-0021 J 1015 distance=157' 11231-0403 RST4474 distance=159' 11172-0153 EPI 1 distance=161' 11220+0033 BAL1446 distance=161' 11336+0035 SLW 616 distance=162' 11384-0226 STF1560 distance=164' 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 11279-0142 RST4944 182 0.1
Show 11280-0155 STF3071 299 35.6 14
Show 11293-0127 K2 3 54 26.0 27
Show 11294-0157 SLW 608 184 40.6 27
Show 11281-0209 SLW 603 82 8.3 28
Show 11257-0127 GWP1584 226 19.5 36
Show 11290-0117 GRV1056 106 9.6 39
Show 11249-0205 EPI 5 190 0.1 50
Show 11246-0156 BAL 536 146 11.5 51
Show 11244-0158 BAL 535 116 7.6 56
Show 11242-0144 SLW 596 309 77.5 56
Show 11296-0233 KPP3847 25 2.8 57
Show 11265-0237 CBL 603 241 8.3 59
Show 11295-0243 GWP1591 151 119.3 65
Show 11245-0246 SLW 597 103 19.6 82
Show 11218-0144 STF3069 219 17.4 92
Show 11216-0211 RST4943 86 1.6 99
Show 11304-0316 GWP1595 211 53.6 102
Show 11214-0212 CVR 606 65 25.2 103
Show 11228-0252 BAL 216 167 14.2 104
Show 11286+0007 UC 2148 80 19.8 111
Show 11273-0333 RST4478 148 0.4 112
Show 11206-0208 UC 2120 152 36.5 112
Show 11310-0006 SLW 611 111 29.3 118
Show 11314-0329 SLW 612 286 37.2 120
Show 11358-0151 BAL 537 121 10.7 120
Show 11287-0018 UC 2149 342 16.8 121
Show 11197-0125 LDS4083 7 6.0 123
Show 11360-0124 GRV1058 189 29.0 124
Show 11294-0343 A 6 AB 56 2.5 124
Show 11321-0332 STF1548 A,BC 127 10.9 127
Show 11321-0332 RST4480 BC 315 0.5 127
Show 11194-0139 STF1529 254 9.3 128
Show 11362-0223 RST4946 232 1.0 132
Show 11326-0008 SLW 614 333 17.2 132
Show 11205-0254 BAL 215 191 16.3 132
Show 11360-0231 EPI 8 AB 224 8.1 132
Show 11360-0231 K2 44 AC 42 28.3 132
Show 11187-0150 CVR 602 295 25.7 138
Show 11323-0025 TOK 142 256 15.9 144
Show 11292+0040 BAL1448 303 0.7 144
Show 11201-0318 CVR 603 93 21.6 152
Show 11380-0136 LDS4125 AB 321 42.2 152
Show 11380-0136 TOK 548 AC 301 788.0 152
Show 11321+0038 LDS4112 156 34.2 154
Show 11344-0021 J 1015 241 3.9 157
Show 11231-0403 RST4474 63 1.4 159
Show 11172-0153 EPI 1 48 22.0 161
Show 11220+0033 BAL1446 280 2.9 161
Show 11336+0035 SLW 616 128 9.5 162
Show 11384-0226 STF1560 279 4.9 164

 
 
WDS 11279-0142 : COMPONENTS
 
 
  A
B pa=182.4°
sep=0.10"
 
 
11279-0142 A
 
 
Componente originario normalizzato AB Name HD 99651 Coord arcsec 2000 112753.73-014159.8 Mag 6.62
Spectral class gK2 PmRA -34.00 PmDE 0.0 SAO 138216
HIP 55941 Tycho2 4923-00979-1 HD 99651 HR 4419
GC 15728 BD BD-00 2442
Tycho2
Tycho2 4923-00979-1 Pflag RAmdeg 171.97379177 DEmdeg -1.69994426
PmRA -35.1 PmDE 3.5 E RAmdeg 4 E DEmdeg 5
E pmRA 0.7 E pmDE 0.7 EpRAm 1990.99 EpDEm 1990.56
Num 23 Q RAmdeg 1.2 Q DEmdeg 1.2 Q pmRA 1.1
Q pmDE 1.3 BTmag 7.564 E BTmag 0.016 VTmag 6.370
E VTmag 0.010 Prox 999 TYC T HIP 55941
CCDM AB RAdeg 171.97387278 DEdeg -1.69995222 EpRA 1990 1.64
EpDE 1990 1.58 E RAdeg 4.1 E DEdeg 4.6 Posflg P
Corr 0.3
SAO
SAO 138216 DelFlag RA1950 PmRA1950 -0.0025
DE1950 PmDE1950 -0.007 Vmag 6.3 SpType K0
Double code Source 70 CatNum 15728 DM BD-00 2442
DMcomp BDsup HD 99651 M HD 0
GC 15728 RA1950rad 2.99035469 DE1950rad -0.02486433 PmRA2000 -0.0023
PmDE2000 -0.003
Hipparcos
Catalog H HIP 55941 Proxy H RAhms 11 27 53.73
DEdms -01 41 59.8 Vmag 6.23 VarFlag R Vmag H
RAdeg 171.974 DEdeg -1.69995 AstroRef * Plx 6.25
CCDM 11279-0142 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 283 Rho 0.216 HD 99651 BD BD-00 2442
CD CP Dm number -00 2442 VIred 1.01
SpType K2III: R SpType Coord arcsec 2000 112753.73-014159.8
Hipparcos 2
HIP 55941 Sn 55 So 3 Nc 2
RArad 3.0015103961 DErad -0.0296697824 Plx 6.21 PmRA -34.88
PmDE 2.04 E RArad 0.54 E DErad 0.42 E Plx 0.71
E pmRA 0.67 E pmDE 0.5 Hpmag 6.3987 E Hpmag 0.0008
SHp 0.007 VA 0 BV 1.037 E BV 0.008
VI 1.01
CCDM
Ccdm 11279-0142 RComp Comp A Note1
Note2 Discov num DRAs -0.28 DDEs -0.3
R dRAs 10 Year Theta Rho
Obs 2 Vmag 7.0 Sp K0 PmNote *
PmRA -30 PmDE 1 Dm number -00 2442 Cat1 BD
Name2 -01 1593 Cat2 AGK2/3 HD 99651 M HD
ADS BDS M ADS BDS N IDS IDS 11228S0109A
HIC 55941
 
 
11279-0142 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 112753.73-014159.9 Mag 8.22 Calc delta mag 1.6
Calc coord yes
CCDM
Ccdm 11279-0142 RComp Comp B Note1
Note2 Discov num RST4944 DRAs DDEs
R dRAs Year 1943 Theta 327 Rho 0.3
Obs 3 Vmag 8.4 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 11228S0109B
HIC 55941