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Current system
03307-1926
HDS 441
HD 21841


Nearby doubles
34' : 03329-1915
SEE 27

41' : 03281-1945
SKF2172

42' : 03289-1959
I 720AB

47' : 03336-1904
RSS 66

56' : 03344-1940
GWP 480

77' : 03351-1841
ARA 525

79' : 03256-1855
GWP 468

81' : 03358-2001
RST5200

87' : 03246-1915
RST2307

94' : 03262-1817
GWP 469

94' : 03305-1752
B 2517AB

97' : 03270-2047
CLZ 13

104' : 03379-1941
TDS2607

110' : 03365-2038
CLL 3

118' : 03377-2028
HJ 3583

128' : 03217-1943
RST2304

132' : 03372-1753
B 2564

135' : 03214-1852
LDS5421

138' : 03217-2019
HJ 3570

140' : 03405-1925
GWP 498

141' : 03266-1718
A 2910

143' : 03363-1728
HDS 456

150' : 03247-2131
HJ 3574

150' : 03262-1710
LDS5425

153' : 03200-1911
UC 985

153' : 03203-2007
LDS3480



Selections
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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.

03307-1926 HDS 441 (HD 21841)

 
 
03h 30m 40.06s -19° 26' 08.0" P.A. 34.00 sep 0.2 mag 8.22,8.47 Sp G5V dist. 44.4 pc (144.83 l.y.)
 
 
Coord 2000 03307-1926 Discov num HDS 441 Comp Coord arcsec 2000 03 30 40.06 -19 26 08.0
Date first 1991 Date last 2021 Obs 25
Pa first 195 Pa last 33.5 P.A. Now (θ) 26.8°
Sep first 0.2 Sep last 0.156 Sep. Now (ρ) 0.179"
Mag pri 8.22 Mag sec 8.47 delta mag (ΔM) 0.25 Spectral class G5V (yellow)
Pri motion ra +000 Sec motion ra
Pri motion dec -007 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 21841 Constellation Eridanus SAO 149001 HIP 16348
Tycho2 5876-00918-1 Gaia DR2 5101676365959144832 HD 21841 BD BD-19 694
Distance 44.4 Distance ly 144.83
 
 
ORBITAL ELEMENTS
 
 
Period (P)18.964y± 0.125 Periastron (T)2007.281y± 0.149 Semi-major axis (a)0.2181a± 0.0097
Eccentricity (e)0.5± 0.059 Inclination (i)102.7°± 1.1 Longitude of periastron (ω)84.4°± 9.8
Node (Ω)17.8°± 0.9 Notes ReferenceCve2016b
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 66.5 0.090
2001 50.1 0.117
2002 39.8 0.144
2003 32.7 0.167
2004 27.0 0.179
2005 21.6 0.174
2006 14.7 0.136
2007 351.4 0.050
2008 213.2 0.078
2009 199.9 0.156
2010 194.4 0.192
2011 190.0 0.201
2012 185.7 0.194
2013 180.7 0.175
2014 174.2 0.150
2015 164.8 0.122
2016 149.8 0.094
2017 124.9 0.075
2018 92.2 0.074
2019 65.8 0.091
2020 49.6 0.118
2021 39.5 0.145
2022 32.5 0.167
2023 26.8 0.179
2024 21.4 0.173
2025 14.3 0.134
2026 348.7 0.046
2027 212.2 0.081
2028 199.7 0.158
2029 194.2 0.193
2030 189.9 0.201


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


 
  


wds03307-1926a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 03307-1926 HDS 441 (HD 21841) : NOTES
 
 
discov_num notes refcode
HDS 441 Cvetkovic et al. (2016) estimate spectral types G2 and G5, masses 1.11
and 1.05 Msun. Dynamical parallax is 24.78 +/- 1.48 mas. Cve2016b
 
 
REFERENCES
 
 
refcode metd author reference
Cve2016b orb - Cvetkovic, Z., Pavlovic, R. & Ninkovic, S. 2016AJ....151...83C
Cve2016b +lin AJ 151, 83, 2016
 
 
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
03307-1926 HDS 441 1991 1 195 0.2 8.22 8.47 G5V 033040.06-192608.0
03307-1926 HDS 441 2008 2 21 0.1 8.22 8.47 G5V 033040.06-192608.0
03307-1926 HDS 441 2011 7 190 0.2 8.22 8.47 G5V D 033040.06-192608.0
03307-1926 HDS 441 2013 9 176 0.2 8.22 8.47 G5V 033040.06-192608.0
03307-1926 HDS 441 2014 11 168 0.1 8.22 8.47 G5V 033040.06-192608.0
03307-1926 HDS 441 2015 14 152 0.1 8.22 8.47 G5V 033040.06-192608.0
03307-1926 HDS 441 2017 18 105 0.1 8.22 8.47 G5V NO 033040.06-192608.0
03307-1926 HDS 441 2018 20 70 0.1 8.22 8.47 G5V NO 033040.06-192608.0
03307-1926 HDS 441 2019 22 56 0.1 8.22 8.47 G5V NO 033040.06-192608.0
03307-1926 HDS 441 2020 24 41 0.1 8.22 8.47 G5V NO 033040.06-192608.0
03307-1926 HDS 441 2021 25 34 0.2 8.22 8.47 G5V NO 033040.06-192608.0

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

 
 
WDS 03307-1926 HDS 441 (HD 21841) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 03307-1926 HDS 441 (HD 21841) : MEASURES
 
 
No records found.

 
 
WDS 03307-1926 (HD 21841) : VIRTUAL EYEPIECE
 
 

03307-1926 HDS 441A mag 8.22 Sp G5V 03307-1926 HDS 441B sep 0.1 P.A. 32.00 mag 8.47 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 03307-1926 (HD 21841) : ALADIN DSS IMAGE @ 03h 30m 40.06s -19° 26' 08.0"
 
 
 
 
WDS 03307-1926 HDS 441 (HD 21841) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

03307-1926 HDS 441 distance=0' 03329-1915 SEE 27 distance=34' 03289-1959 I 720BC distance=41' 03281-1945 SKF2172 distance=41' 03289-1959 I 720AB distance=42' 03336-1904 RSS 66 distance=47' 03344-1940 GWP 480 distance=56' 03351-1841 ARA 525 distance=77' 03256-1855 GWP 468 distance=79' 03358-2001 RST5200 distance=81' 03246-1915 RST2307 distance=87' 03305-1752 B 2517BC distance=94' 03262-1817 GWP 469 distance=94' 03305-1752 B 2517AB distance=94' 03270-2047 CLZ 13 distance=97' 03379-1941 TDS2607 distance=104' 03365-2038 CLL 3 distance=110' 03377-2028 HJ 3583 distance=118' 03217-1943 RST2304 distance=128' 03372-1753 B 2564 distance=132' 03214-1852 LDS5421 distance=135' 03217-2019 HJ 3570 distance=138' 03405-1925 GWP 498 distance=140' 03266-1718 A 2910 distance=141' 03363-1728 HDS 456 distance=143' 03247-2131 HJ 3574 distance=150' 03262-1710 LDS5425 distance=150' 03200-1911 UC 985 distance=153' 03203-2007 LDS3480 distance=153' 03204-1835 UC 987 distance=155' 03304-2202 DON 51 distance=157' 03417-1948 KPP3538 distance=158' 03240-1718 A 2908 distance=160' 03417-1842 TVB 54 distance=163' 03411-1756 RST2315 distance=174' 03241-1657 RST2306 distance=177' 03357-1644 GWP 484 distance=177' 03370-2200 TDS2601 distance=178' 03187-1834 HJ 3565 distance=178' 03181-1904 I 341AB distance=179' 03181-1904 I 341AC distance=179' 03207-1731 RST2302 distance=183' 03384-1659 KPP1301 distance=184' 03357-1636 BRT 607 distance=185' 03189-2054 ARA1266 distance=189' 03199-1728 RST2301 distance=194' 03440-1836 GWP 505 distance=196' 03168-1956 HJ 3561 distance=198' 03346-1613 GAL 332AB distance=201' 03368-2229 HDS 458 distance=203' 03172-2041 SKF 422 distance=204' 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 03307-1926 HDS 441 34 0.2
Show 03329-1915 SEE 27 347 0.5 34
Show 03289-1959 I 720 BC 343 2.3 41
Show 03281-1945 SKF2172 341 71.9 41
Show 03289-1959 I 720 AB 44 25.9 42
Show 03336-1904 RSS 66 88 37.1 47
Show 03344-1940 GWP 480 36.7 56
Show 03351-1841 ARA 525 241 7.4 77
Show 03256-1855 GWP 468 199 50.0 79
Show 03358-2001 RST5200 106 0.1 81
Show 03246-1915 RST2307 218 1.2 87
Show 03305-1752 B 2517 BC 13 2.0 94
Show 03262-1817 GWP 469 224 77.2 94
Show 03305-1752 B 2517 AB 177 26.1 94
Show 03270-2047 CLZ 13 28 61.9 97
Show 03379-1941 TDS2607 78 0.9 104
Show 03365-2038 CLL 3 206 42.5 110
Show 03377-2028 HJ 3583 87 12.0 118
Show 03217-1943 RST2304 91 2.1 128
Show 03372-1753 B 2564 65 18.8 132
Show 03214-1852 LDS5421 166 25.9 135
Show 03217-2019 HJ 3570 256 34.0 138
Show 03405-1925 GWP 498 317 25.0 140
Show 03266-1718 A 2910 278 2.3 141
Show 03363-1728 HDS 456 100 0.1 143
Show 03247-2131 HJ 3574 86 16.4 150
Show 03262-1710 LDS5425 2 13.0 150
Show 03200-1911 UC 985 49 24.2 153
Show 03203-2007 LDS3480 30 27.2 153
Show 03204-1835 UC 987 235 11.4 155
Show 03304-2202 DON 51 183 0.6 157
Show 03417-1948 KPP3538 158 1.9 158
Show 03240-1718 A 2908 256 4.4 160
Show 03417-1842 TVB 54 153 1.6 163
Show 03411-1756 RST2315 145 1.8 174
Show 03241-1657 RST2306 315 1.8 177
Show 03357-1644 GWP 484 20 16.3 177
Show 03370-2200 TDS2601 339 0.7 178
Show 03187-1834 HJ 3565 122 8.0 178
Show 03181-1904 I 341 AB 160 4.1 179
Show 03181-1904 I 341 AC 94 52.9 179
Show 03207-1731 RST2302 121 1.2 183
Show 03384-1659 KPP1301 265 9.9 184
Show 03357-1636 BRT 607 257 5.1 185
Show 03189-2054 ARA1266 93 10.6 189
Show 03199-1728 RST2301 30 1.4 194
Show 03440-1836 GWP 505 184 108.2 196
Show 03168-1956 HJ 3561 152 25.7 198
Show 03346-1613 GAL 332 AB 235 20.8 201
Show 03368-2229 HDS 458 221 1.4 203
Show 03172-2041 SKF 422 52 5.7 204

 
 
WDS 03307-1926 : COMPONENTS
 
 
  A
B pa=32.0°
sep=0.15"
 
 
03307-1926 A
 
 
Componente originario normalizzato AB Name HD 21841 Coord arcsec 2000 033040.06-192608.0 Mag 8.22
Spectral class G5V (yellow) PmRA 0.00 PmDE -7.0 SAO 149001
HIP 16348 Tycho2 5876-00918-1 HD 21841 BD BD-19 694
Tycho2
Tycho2 5876-00918-1 Pflag RAmdeg 52.66689147 DEmdeg -19.43558312
PmRA -0.6 PmDE -6.2 E RAmdeg 5 E DEmdeg 5
E pmRA 1.4 E pmDE 1.3 EpRAm 1991.35 EpDEm 1991.25
Num 10 Q RAmdeg 0.8 Q DEmdeg 0.8 Q pmRA 0.8
Q pmDE 0.8 BTmag 8.291 E BTmag 0.016 VTmag 7.542
E VTmag 0.011 Prox 999 TYC T HIP 16348
CCDM AB RAdeg 52.66689278 DEdeg -19.43556889 EpRA 1990 1.75
EpDE 1990 1.66 E RAdeg 5.1 E DEdeg 5.3 Posflg P
Corr -0.2
SAO
SAO 149001 DelFlag RA1950 PmRA1950 -0.0017
DE1950 PmDE1950 -0.008 Vmag 7.6 SpType G0
Double code Source 23 CatNum 983 DM BD-19 694
DMcomp BDsup HD 21841 M HD 0
GC RA1950rad 0.90939206 DE1950rad -0.34217867 PmRA2000 -0.0013
PmDE2000 -0.01
Hipparcos
Catalog H HIP 16348 Proxy H RAhms 03 30 40.06
DEdms -19 26 08.0 Vmag 7.45 VarFlag R Vmag G
RAdeg 52.6669 DEdeg -19.4356 AstroRef * Plx 23.76
CCDM 03307-1926 N CCDM H Nsys 1 Ncomp 2
MultFlag C Source S Qual A M HIP AB
Theta 195 Rho 0.183 HD 21841 BD BD-19 694
CD CP Dm number -19 694 VIred 0.73
SpType G5V R SpType Coord arcsec 2000 033040.06-192608.0
Hipparcos 2
HIP 16348 Sn 55 So 3 Nc 2
RArad 0.9192107535 DErad -0.3392146472 Plx 22.52 PmRA -0.4
PmDE -6.55 E RArad 0.66 E DErad 0.54 E Plx 0.88
E pmRA 0.86 E pmDE 0.77 Hpmag 7.5859 E Hpmag 0.0015
SHp 0.012 VA 0 BV 0.666 E BV 0.015
VI 0.73
CCDM
Ccdm 03307-1926 RComp Comp A Note1
Note2 Discov num DRAs -1.95 DDEs -8.0
R dRAs 82 Year Theta Rho
Obs 2 Vmag 8.2 Sp G5 PmNote *
PmRA -7 PmDE 1 Dm number -19 694 Cat1 BD
Name2 149001 Cat2 SAO HD 21841 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 16348
 
 
03307-1926 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 033040.07-192607.9 Mag 8.47 Calc delta mag 0.25
Calc coord yes
CCDM
Ccdm 03307-1926 RComp Comp B Note1
Note2 Discov num HDS DRAs -1.94 DDEs -8.3
R dRAs 82 Year 1991 Theta 195 Rho 0.2
Obs 1 Vmag 8.5 Sp PmNote *
PmRA 9 PmDE -16 Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS
HIC 16348