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Current system
10557+0044
BU 1076
55 Leo


Nearby doubles
12' : 10555-0055
GWP1498

15' : 10549+0051
GWP1492

17' : 10554-0059
NSN 131

20' : 10562+0026
OCC 335

21' : 10570-0051
LDS6235

26' : 10562+0020
SLW 542

26' : 10540+0036
GRV1049

30' : 10572+0025
ITF 71

39' : 10555+0006
SKF 890

43' : 10574-0010
STF1493

47' : 10541+0124
LDS4033

47' : 10543+0003
CBL 323

49' : 10527+0029
TOK 893AB

50' : 10568+0131
BAL1878AB

51' : 10523+0012
LDS6233

55' : 10522+0101
BUP 134

62' : 10519+0105
CVR 584

65' : 10520-0010
WIS 176

68' : 10574+0147
HEI 763

79' : 10548+0201
SLW 539

81' : 11010+0100
GWP1519

83' : 10514+0136
LDS4025AB

91' : 11011+0003
HJ 1182

100' : 10491-0058
BVD 147

101' : 10590+0212
OCC 511

102' : 10494+0121
ZHN 16



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.

10557+0044 BU 1076 (55 Leo)

 
 
10h 55m 42.40s +00° 44' 13.0" P.A. 48.00 sep 1.1 mag 5.98,9.02 Sp F4V dist. 44.86 pc (146.33 l.y.)
 
 
Coord 2000 10557+0044 Discov num BU 1076 Comp Coord arcsec 2000 10 55 42.40 +00 44 13.0
Date first 1889 Date last 2021 Obs 62
Pa first 50 Pa last 48.4 P.A. Now (θ) 47.9°
Sep first 1.0 Sep last 1.075 Sep. Now (ρ) 1.064"
Mag pri 5.98 Mag sec 9.02 delta mag (ΔM) 3.04 Spectral class F4V (yellow-white)
Pri motion ra +100 Sec motion ra +103
Pri motion dec +000 Sec motion dec -003
Notes N O (See Notes, Orbital solution)
rPM=0.041 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 55 Leo Constellation Leo SAO 118574 HIP 53423
Tycho2 0255-01197-1 Gaia DR2 3807937319101754112 HD 94672 HR 4265
GC 15022 ADS 7982 BD BD+01 2501 Flamsteed 55 Leonis
Flamsteed name 55 Leo Distance 44.86 Distance ly 146.33
 
 
ORBITAL ELEMENTS
 
 
Period (P)138.9y± 3.02 Periastron (T)1921.62y± 5.07 Semi-major axis (a)0.75a± 0.069
Eccentricity (e)0.714± 0.036 Inclination (i)125.7°± 9.5 Longitude of periastron (ω)323.4°± 10.8
Node (Ω)219.3°± 4 Notesn ReferenceTok2015c
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 58.7 1.154
2001 58.2 1.155
2002 57.8 1.156
2003 57.3 1.156
2004 56.9 1.156
2005 56.4 1.156
2006 56.0 1.155
2007 55.5 1.154
2008 55.1 1.152
2009 54.6 1.149
2010 54.2 1.147
2011 53.7 1.143
2012 53.3 1.140
2013 52.8 1.136
2014 52.3 1.131
2015 51.9 1.126
2016 51.4 1.120
2017 50.9 1.114
2018 50.4 1.107
2019 50.0 1.100
2020 49.5 1.092
2021 49.0 1.083
2022 48.4 1.074
2023 47.9 1.064
2024 47.4 1.054
2025 46.8 1.043
2026 46.3 1.031
2027 45.7 1.019
2028 45.1 1.006
2029 44.5 0.992
2030 43.9 0.978


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


 
  


wds10557%2B0044d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 10557+0044 BU 1076 (55 Leo) : NOTES
 
 
discov_num notes refcode
BU 1076 55 Leo. If T is reasonably accurate, the RV run of the primary in
1919-30 would fit the visual motion with an ascending node in the third
quadrant.
 
 
REFERENCES
 
 
refcode metd author reference
Tok2015c orb+j Tokovinin, A., Mason, B.D., Hartkopf, W.I., Mendez, R.A., & Horch, E.P. 2015AJ....150...50T
Tok2015c +St AJ 150, 50, 2015 (some measures corrected in Tok2017b) 2017AJ....154..110T
 
 
DISCOVERER
 
 
idgroup discov author
1 BU Burnham, S.W. (BU 1 - 81)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
10557+0044 BU 1076 2006 53 56 1.2 5.98 9.02 F4V NOD 105542.40+004413.0
10557+0044 BU 1076 2009 55 54 1.2 5.98 9.02 F4V NOD 105542.40+004413.0
10557+0044 BU 1076 2010 56 55 1.1 5.98 9.02 F4V NOD 105542.40+004413.0
10557+0044 BU 1076 2013 57 53 1.1 5.98 9.02 F4V NOD 105542.40+004413.0
10557+0044 BU 1076 2014 59 53 1.1 5.98 9.02 F4V NO 105542.40+004413.0
10557+0044 BU 1076 2015 60 52 1.1 5.98 9.02 F4V NO 105542.40+004413.0
10557+0044 BU 1076 2019 61 50 1.1 5.98 9.02 F4V NO 105542.40+004413.0
10557+0044 BU 1076 2021 62 48 1.1 5.98 9.02 F4V NO 105542.40+004413.0

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

 
 
WDS 10557+0044 BU 1076 (55 Leo) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 10557+0044 BU 1076 (55 Leo) : MEASURES
 
 
No records found.

 
 
WDS 10557+0044 (55 Leo) : VIRTUAL EYEPIECE
 
 

10557+0044 BU 1076A mag 5.98 Sp F4V 10557+0044 BU 1076B sep 1.1 P.A. 48.40 mag 9.02 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 10557+0044 (55 Leo) : ALADIN DSS IMAGE @ 10h 55m 42.40s +00° 44' 13.0"
 
 
 
 
WDS 10557+0044 BU 1076 (55 Leo) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

10557+0044 BU 1076 distance=1' 10555-0055 GWP1498 distance=12' 10549+0051 GWP1492 distance=15' 10554-0059 NSN 131 distance=17' 10562+0026 OCC 335 distance=20' 10570-0051 LDS6235 distance=21' 10562+0020 SLW 542 distance=26' 10540+0036 GRV1049 distance=26' 10572+0025 ITF 71 distance=30' 10555+0006 SKF 890 distance=39' 10574-0010 STF1493 distance=43' 10541+0124 LDS4033 distance=47' 10543+0003 CBL 323 distance=47' 10527+0029 TOK 893AB distance=49' 10527+0029 TOK 893BC distance=49' 10568+0131 BAL1878AB distance=50' 10568+0131 BAL1878AC distance=50' 10523+0012 LDS6233 distance=51' 10522+0101 BUP 134 distance=55' 10519+0105 CVR 584 distance=62' 10520-0010 WIS 176 distance=65' 10574+0147 HEI 763 distance=68' 10548+0201 SLW 539 distance=79' 11010+0100 GWP1519 distance=81' 10514+0136 LDS4025AB distance=83' 11011+0003 HJ 1182 distance=91' 10491-0058 BVD 147 distance=100' 10590+0212 OCC 511 distance=101' 10494+0121 ZHN 16 distance=102' 10572-0102 BAL 862 distance=108' 10488+0124 A 2572 distance=111' 10578-0107 GWP1509 distance=116' 11028+0136 GWP1528 distance=119' 10474-0053 RST4931 distance=126' 11041-0031 BAL1156 distance=127' 10483+0149 SLN 65 distance=129' 10522-0116 UC 2013 distance=131' 11041-0006 KPP2757 distance=133' 10531+0251 SLN 20 distance=133' 10469+0049 RST5351 distance=133' 10466+0051 RST5350 distance=137' 11049-0043 SLW 565 distance=138' 10460-0049 GRV1047 distance=139' 10518+0254 FMR 217 distance=143' 10530+0301 BAL2377 distance=143' 10564-0142 BAL 529 distance=147' 10481-0218 OCC1061 distance=147' 10489-0102 GWP1465 distance=148' 10580+0308 BAL2378 distance=148' 10457-0039 RST5349 distance=151' 11005+0258 AG 173 distance=153' 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 10557+0044 BU 1076 48 1.1 1
Show 10555-0055 GWP1498 19 70.2 12
Show 10549+0051 GWP1492 251 22.9 15
Show 10554-0059 NSN 131 26 3.8 17
Show 10562+0026 OCC 335 -1 0.0 20
Show 10570-0051 LDS6235 114 26.3 21
Show 10562+0020 SLW 542 140 95.3 26
Show 10540+0036 GRV1049 82 19.7 26
Show 10572+0025 ITF 71 159 521.6 30
Show 10555+0006 SKF 890 295 118.8 39
Show 10574-0010 STF1493 356 26.6 43
Show 10541+0124 LDS4033 275 22.9 47
Show 10543+0003 CBL 323 117 42.1 47
Show 10527+0029 TOK 893 AB 245 1.7 49
Show 10527+0029 TOK 893 BC 58 0.2 49
Show 10568+0131 BAL1878 AB 73 11.0 50
Show 10568+0131 BAL1878 AC 284 100.7 50
Show 10523+0012 LDS6233 301 6.8 51
Show 10522+0101 BUP 134 271 39.8 55
Show 10519+0105 CVR 584 275 10.7 62
Show 10520-0010 WIS 176 296 132.6 65
Show 10574+0147 HEI 763 251 0.8 68
Show 10548+0201 SLW 539 76 164.8 79
Show 11010+0100 GWP1519 150 41.4 81
Show 10514+0136 LDS4025 AB 325 7.5 83
Show 11011+0003 HJ 1182 107 33.3 91
Show 10491-0058 BVD 147 129 62.8 100
Show 10590+0212 OCC 511 -1 0.0 101
Show 10494+0121 ZHN 16 32 12.9 102
Show 10572-0102 BAL 862 190 9.6 108
Show 10488+0124 A 2572 121 0.8 111
Show 10578-0107 GWP1509 186 50.6 116
Show 11028+0136 GWP1528 178 9.6 119
Show 10474-0053 RST4931 309 0.8 126
Show 11041-0031 BAL1156 94 9.3 127
Show 10483+0149 SLN 65 21 2.8 129
Show 10522-0116 UC 2013 186 11.3 131
Show 11041-0006 KPP2757 18 2.6 133
Show 10531+0251 SLN 20 157 26.6 133
Show 10469+0049 RST5351 343 0.9 133
Show 10466+0051 RST5350 190 0.5 137
Show 11049-0043 SLW 565 314 163.9 138
Show 10460-0049 GRV1047 228 31.9 139
Show 10518+0254 FMR 217 35 3.6 143
Show 10530+0301 BAL2377 110 5.3 143
Show 10564-0142 BAL 529 164 16.0 147
Show 10481-0218 OCC1061 -1 0.1 147
Show 10489-0102 GWP1465 61 11.3 148
Show 10580+0308 BAL2378 300 2.9 148
Show 10457-0039 RST5349 171 3.1 151
Show 11005+0258 AG 173 127 2.2 153

 
 
WDS 10557+0044 : COMPONENTS
 
 
  A
B pa=48.4°
sep=1.07"
 
 
10557+0044 A
 
 
Componente originario normalizzato AB Name 55 Leo Coord arcsec 2000 105542.40+004413.0 Mag 5.98
Spectral class F4V (yellow-white) PmRA 100.00 PmDE 0.0 SAO 118574
HIP 53423 Tycho2 0255-01197-1 HD 94672 HR 4265
GC 15022 ADS 7982 BD BD+01 2501 Flamsteed 55 Leonis
Flamsteed name 55 Leo
Tycho2
Tycho2 0255-01197-1 Pflag RAmdeg 163.92664947 DEmdeg 0.73693427
PmRA 100.3 PmDE -0.3 E RAmdeg 3 E DEmdeg 4
E pmRA 0.6 E pmDE 0.6 EpRAm 1991.41 EpDEm 1990.94
Num 26 Q RAmdeg 1.7 Q DEmdeg 1.2 Q pmRA 1.8
Q pmDE 1.3 BTmag 6.431 E BTmag 0.015 VTmag 5.984
E VTmag 0.009 Prox 11 TYC T HIP 53423
CCDM A RAdeg 163.92642083 DEdeg 0.73693500 EpRA 1990 1.79
EpDE 1990 1.63 E RAdeg 3.3 E DEdeg 3.9 Posflg P
Corr 0.1
SAO
SAO 118574 DelFlag RA1950 PmRA1950 0.0069
DE1950 PmDE1950 -0.004 Vmag 6 SpType F2
Double code Source 70 CatNum 15022 DM BD+01 2501
DMcomp BDsup HD 94672 M HD 0
GC 15022 RA1950rad 2.84983525 DE1950rad 0.01752266 PmRA2000 0.0071
PmDE2000 0
Hipparcos
Catalog H HIP 53423 Proxy H RAhms 10 55 42.34
DEdms +00 44 13.0 Vmag 5.91 VarFlag R Vmag G
RAdeg 163.926 DEdeg 0.736931 AstroRef A Plx 22.85
CCDM 10557+0044 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual B M HIP AB
Theta 61 Rho 1.108 HD 94672 BD BD+01 2501
CD CP Dm number +01 2501 VIred 0.49
SpType F2III R SpType Coord arcsec 2000 105542.34+004413.0
Hipparcos 2
HIP 53423 Sn 15 So 3 Nc 2
RArad 2.8610554893 DErad 0.0128618624 Plx 22.29 PmRA 103.98
PmDE -2.9 E RArad 0.45 E DErad 0.31 E Plx 0.48
E pmRA 0.55 E pmDE 0.37 Hpmag 6.0061 E Hpmag 0.0008
SHp 0.006 VA 0 BV 0.425 E BV 0.005
VI 0.49
CCDM
Ccdm 10557+0044 RComp Comp A Note1
Note2 Discov num DRAs 0.39 DDEs 13.5
R dRAs 10 Year Theta Rho
Obs 2 Vmag 6.0 Sp F2 PmNote *
PmRA 97 PmDE 3 Dm number +01 2501 Cat1 BD
Name2 +01 1342 Cat2 AGK2/3 HD 94672 M HD
ADS BDS A 7982 M ADS BDS N IDS IDS 10506N0116A
HIC 53423
 
 
10557+0044 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 105542.45+004413.7 Mag 9.02 PmRA 103.00
PmDE -3.0 Calc delta mag 3.04 Calc coord yes
CCDM
Ccdm 10557+0044 RComp Comp B Note1 *
Note2 Discov num BU 1076 DRAs DDEs
R dRAs Year 1889 Theta Rho
Obs 11 Vmag 10.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A 7982 M ADS BDS N N IDS IDS 10506N0116B
HIC 53423