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Doubles in session


Current system
03363-1728
HDS 456
20 Eri


Nearby doubles
28' : 03372-1753
B 2564

42' : 03384-1659
KPP1301

45' : 03357-1644
GWP 484

53' : 03357-1636
BRT 607

74' : 03411-1756
RST2315

76' : 03351-1841
ARA 525

79' : 03346-1613
GAL 332AB

85' : 03421-1709
HU 436AB

86' : 03305-1752
B 2517AB

87' : 03349-1604
GAL 353

89' : 03388-1607
LDS3517

91' : 03423-1705
LDS3526

91' : 03397-1612
GWP 496

99' : 03341-1555
LDS3507

104' : 03336-1904
RSS 66

105' : 03383-1547
A 3004

107' : 03417-1842
TVB 54

110' : 03335-1547
LDS3506

118' : 03329-1915
SEE 27

125' : 03422-1558
A 2912

129' : 03440-1836
GWP 505

132' : 03405-1925
GWP 498

133' : 03295-1558
GWP 472

134' : 03452-1647
RST2320

135' : 03379-1941
TDS2607

135' : 03344-1940
GWP 480



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.

03363-1728 HDS 456 (20 Eri)

 
 
03h 36m 17.39s -17° 28' 01.3" P.A. 100.00 sep 0.1 mag 5.48,6.84 Sp B8/B9III dist. 149.25 pc (486.85 l.y.)
 
 
Coord 2000 03363-1728 Discov num HDS 456 Comp Coord arcsec 2000 03 36 17.39 -17 28 01.3
Date first 1991 Date last 2020 Obs 20
Pa first 65 Pa last 99.5 P.A. Now (θ) 92.6°
Sep first 0.2 Sep last 0.113 Sep. Now (ρ) 0.158"
Mag pri 5.48 Mag sec 6.84 delta mag (ΔM) 1.36 Spectral class B8/B9III (blue-white)
Pri motion ra +033 Sec motion ra
Pri motion dec -010 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 20 Eri Var name EG Eri Constellation Eridanus SAO 149063
HIP 16803 Tycho2 5874-01098-1 Gaia DR2 5108493960822714752 HD 22470
HR 1100 GC 4305 BD BD-17 699 Flamsteed 20 Eridani
Flamsteed name 20 Eri FK5 1100 Distance 149.25 Distance ly 486.85
 
 
ORBITAL ELEMENTS
 
 
Period (P)21y± 0.27 Periastron (T)2018.05y± 0.08 Semi-major axis (a)0.107a± 0.003
Eccentricity (e)0.841± 0.008 Inclination (i)134.3°± 2.4 Longitude of periastron (ω)197.9°± 8.2
Node (Ω)92.8°± 5.9 Notes ReferenceTok2019c
Equinox Last observation2018 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 100.3 0.119
2001 95.9 0.141
2002 92.6 0.158
2003 89.8 0.171
2004 87.4 0.181
2005 85.3 0.187
2006 83.2 0.191
2007 81.2 0.193
2008 79.2 0.191
2009 77.1 0.187
2010 74.9 0.181
2011 72.6 0.172
2012 69.9 0.160
2013 66.7 0.145
2014 62.7 0.127
2015 57.2 0.105
2016 48.2 0.078
2017 27.4 0.045
2018 272.9 0.017
2019 122.7 0.051
2020 107.1 0.090
2021 100.3 0.119
2022 95.9 0.141
2023 92.6 0.158
2024 89.8 0.171
2025 87.4 0.181
2026 85.3 0.187
2027 83.2 0.191
2028 81.2 0.193
2029 79.2 0.191
2030 77.1 0.187


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


 
  


wds03363-1728a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 03363-1728 HDS 456 (20 Eri) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Tok2019c St j Tokovinin, A., Mason, B.D., Mendez, R.A., Horch, E.P. & Briceno, C. 2019AJ....158...48T
Tok2019c +orb AJ 158, 48, 2019
 
 
DISCOVERER
 
 
idgroup discov author
1 HDS Hipparcos Double Star (from additional DD list)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
03363-1728 HDS 456 2000 2 97 0.1 5.48 6.84 B8/B9III D 033617.39-172801.3
03363-1728 HDS 456 2007 3 80 0.2 5.48 6.84 B8/B9III D 033617.39-172801.3
03363-1728 HDS 456 2008 4 77 0.2 5.48 6.84 B8/B9III D 033617.39-172801.3
03363-1728 HDS 456 2010 7 73 0.2 5.48 6.84 B8/B9III 033617.39-172801.3
03363-1728 HDS 456 2014 9 58 0.1 5.48 6.84 B8/B9III 033617.39-172801.3
03363-1728 HDS 456 2015 10 50 0.1 5.48 6.84 B8/B9III 033617.39-172801.3
03363-1728 HDS 456 2016 15 29 0.0 5.48 6.84 B8/B9III 033617.39-172801.3
03363-1728 HDS 456 2018 17 123 0.1 5.48 6.84 B8/B9III 033617.39-172801.3
03363-1728 HDS 456 2019 18 110 0.1 5.48 6.84 B8/B9III O 033617.39-172801.3
03363-1728 HDS 456 2020 20 100 0.1 5.48 6.84 B8/B9III O 033617.39-172801.3

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

 
 
WDS 03363-1728 HDS 456 (20 Eri) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 03363-1728 HDS 456 (20 Eri) : MEASURES
 
 
No records found.

 
 
WDS 03363-1728 (20 Eri) : VIRTUAL EYEPIECE
 
 

03363-1728 HDS 456A mag 5.48 Sp B8/B9III 03363-1728 HDS 456B sep 0.1 P.A. 100.00 mag 6.84 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 03363-1728 (20 Eri) : ALADIN DSS IMAGE @ 03h 36m 17.39s -17° 28' 01.3"
 
 
 
 
WDS 03363-1728 HDS 456 (20 Eri) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

03363-1728 HDS 456 distance=0' 03372-1753 B 2564 distance=28' 03384-1659 KPP1301 distance=42' 03357-1644 GWP 484 distance=45' 03357-1636 BRT 607 distance=53' 03411-1756 RST2315 distance=74' 03351-1841 ARA 525 distance=76' 03346-1613 GAL 332AB distance=79' 03421-1709 HU 436AB distance=85' 03305-1752 B 2517AB distance=86' 03305-1752 B 2517BC distance=86' 03349-1604 GAL 353 distance=87' 03388-1607 LDS3517 distance=89' 03423-1705 LDS3526 distance=91' 03397-1612 GWP 496 distance=91' 03341-1555 LDS3507 distance=99' 03336-1904 RSS 66 distance=104' 03383-1547 A 3004 distance=105' 03417-1842 TVB 54 distance=107' 03335-1547 LDS3506 distance=110' 03329-1915 SEE 27 distance=118' 03422-1558 A 2912 distance=125' 03440-1836 GWP 505 distance=129' 03405-1925 GWP 498 distance=132' 03295-1558 GWP 472 distance=133' 03452-1647 RST2320 distance=134' 03379-1941 TDS2607 distance=135' 03344-1940 GWP 480 distance=135' 03338-1508 TOK 239Ba,Bb distance=135' 03266-1718 A 2910 distance=139' 03461-1708 GWP 507 distance=142' 03307-1926 HDS 441 distance=143' 03318-1521 UC 1020 distance=143' 03338-1508 TOK 239AB distance=146' 03262-1710 LDS5425 distance=146' 03262-1817 GWP 469 distance=153' 03358-2001 RST5200 distance=154' 03286-1537 LDS3498 distance=156' 03465-1631 HDO 63 distance=157' 03404-1502 GWP 497 distance=158' 03417-1948 KPP3538 distance=160' 03420-1508 HDS 471 distance=163' 03472-1847 KPP1382 distance=175' 03256-1855 GWP 468 distance=176' 03240-1718 A 2908 distance=176' 03437-1509 BRT 563 distance=177' 03241-1657 RST2306 distance=178' 03281-1945 SKF2172 distance=180' 03377-2028 HJ 3583 distance=182' 03289-1959 I 720BC distance=184' 03289-1959 I 720AB distance=184' 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 03363-1728 HDS 456 100 0.1
Show 03372-1753 B 2564 65 18.8 28
Show 03384-1659 KPP1301 265 9.9 42
Show 03357-1644 GWP 484 20 16.3 45
Show 03357-1636 BRT 607 257 5.1 53
Show 03411-1756 RST2315 145 1.8 74
Show 03351-1841 ARA 525 241 7.4 76
Show 03346-1613 GAL 332 AB 235 20.8 79
Show 03421-1709 HU 436 AB 303 1.3 85
Show 03305-1752 B 2517 AB 177 26.1 86
Show 03305-1752 B 2517 BC 13 2.0 86
Show 03349-1604 GAL 353 203 14.2 87
Show 03388-1607 LDS3517 69 6.6 89
Show 03423-1705 LDS3526 270 2.0 91
Show 03397-1612 GWP 496 314 7.6 91
Show 03341-1555 LDS3507 237 11.1 99
Show 03336-1904 RSS 66 88 37.1 104
Show 03383-1547 A 3004 26 2.2 105
Show 03417-1842 TVB 54 153 1.6 107
Show 03335-1547 LDS3506 186 34.0 110
Show 03329-1915 SEE 27 347 0.5 118
Show 03422-1558 A 2912 27 1.6 125
Show 03440-1836 GWP 505 184 108.2 129
Show 03405-1925 GWP 498 317 25.0 132
Show 03295-1558 GWP 472 130 94.3 133
Show 03452-1647 RST2320 91 0.6 134
Show 03379-1941 TDS2607 78 0.9 135
Show 03344-1940 GWP 480 36.7 135
Show 03338-1508 TOK 239 Ba,Bb 337 0.9 135
Show 03266-1718 A 2910 278 2.3 139
Show 03461-1708 GWP 507 189 24.0 142
Show 03307-1926 HDS 441 34 0.2 143
Show 03318-1521 UC 1020 163 51.8 143
Show 03338-1508 TOK 239 AB 180 624.7 146
Show 03262-1710 LDS5425 2 13.0 146
Show 03262-1817 GWP 469 224 77.2 153
Show 03358-2001 RST5200 106 0.1 154
Show 03286-1537 LDS3498 171 16.4 156
Show 03465-1631 HDO 63 113 22.6 157
Show 03404-1502 GWP 497 186 18.9 158
Show 03417-1948 KPP3538 158 1.9 160
Show 03420-1508 HDS 471 17 1.7 163
Show 03472-1847 KPP1382 3 10.4 175
Show 03256-1855 GWP 468 199 50.0 176
Show 03240-1718 A 2908 256 4.4 176
Show 03437-1509 BRT 563 68 3.1 177
Show 03241-1657 RST2306 315 1.8 178
Show 03281-1945 SKF2172 341 71.9 180
Show 03377-2028 HJ 3583 87 12.0 182
Show 03289-1959 I 720 BC 343 2.3 184
Show 03289-1959 I 720 AB 44 25.9 184

 
 
WDS 03363-1728 : COMPONENTS
 
 
  A
B pa=100.0°
sep=0.11"
 
 
03363-1728 A
 
 
Componente originario normalizzato AB Name 20 Eri Coord arcsec 2000 033617.39-172801.3 Mag 5.48
Spectral class B8/B9III (blue-white) PmRA 33.00 PmDE -10.0 SAO 149063
HIP 16803 Tycho2 5874-01098-1 HD 22470 HR 1100
GC 4305 BD BD-17 699 Flamsteed 20 Eridani Flamsteed name 20 Eri
FK5 1100
Tycho2
Tycho2 5874-01098-1 Pflag RAmdeg 54.07254010 DEmdeg -17.46706696
PmRA 28.5 PmDE -10.3 E RAmdeg 3 E DEmdeg 4
E pmRA 0.7 E pmDE 0.7 EpRAm 1991.40 EpDEm 1990.91
Num 22 Q RAmdeg 1.7 Q DEmdeg 1.5 Q pmRA 1.9
Q pmDE 1.6 BTmag 5.072 E BTmag 0.014 VTmag 5.218
E VTmag 0.009 Prox 999 TYC T HIP 16803
CCDM AB RAdeg 54.07247222 DEdeg -17.46704222 EpRA 1990 1.78
EpDE 1990 1.44 E RAdeg 3.4 E DEdeg 3.9 Posflg P
Corr 0.0
SAO
SAO 149063 DelFlag RA1950 PmRA1950 0.0014
DE1950 PmDE1950 -0.007 Vmag 5.3 SpType A0p
Double code Source 74 CatNum 1100 DM BD-17 699
DMcomp BDsup HD 22470 M HD 0
GC 4305 RA1950rad 0.93379426 DE1950rad -0.30772652 PmRA2000 0.0018
PmDE2000 -0.009
Hipparcos
Catalog H HIP 16803 Proxy H RAhms 03 36 17.39
DEdms -17 28 01.3 Vmag 5.24 VarFlag 1 R Vmag H
RAdeg 54.0725 DEdeg -17.467 AstroRef * Plx 6.89
CCDM 03363-1728 N CCDM H Nsys 1 Ncomp 2
MultFlag C Source S Qual A M HIP AB
Theta 65 Rho 0.152 HD 22470 BD BD-17 699
CD CP Dm number -17 699 VIred -0.12
SpType B8/B9III R SpType Coord arcsec 2000 033617.39-172801.3
Hipparcos 2
HIP 16803 Sn 55 So 3 Nc 2
RArad 0.9437426011 DErad -0.3048573717 Plx 6.7 PmRA 32.37
PmDE -10.91 E RArad 0.45 E DErad 0.36 E Plx 0.51
E pmRA 0.53 E pmDE 0.48 Hpmag 5.208 E Hpmag 0.0064
SHp 0.025 VA 1 BV -0.117 E BV 0.005
VI -0.1
CCDM
Ccdm 03363-1728 RComp Comp A Note1
Note2 Discov num DRAs -0.59 DDEs -1.4
R dRAs 82 Year Theta Rho
Obs 2 Vmag 5.5 Sp B8 PmNote *
PmRA 33 PmDE -10 Dm number -17 699 Cat1 BD
Name2 149063 Cat2 SAO HD 22470 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 16803
 
 
03363-1728 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 033617.40-172801.3 Mag 6.84 Calc delta mag 1.36
Calc coord yes
CCDM
Ccdm 03363-1728 RComp Comp B Note1
Note2 Discov num HDS DRAs -0.58 DDEs -1.4
R dRAs 82 Year 1991 Theta 65 Rho 0.2
Obs 1 Vmag 6.8 Sp PmNote *
PmRA 33 PmDE -10 Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS
HIC 16803