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Doubles in session


Current system
03124-4425
HJ 3556 AB,C
HD 20121


Nearby doubles
42' : 03149-4458
TOI 914

43' : 03087-4413
HDS 398

50' : 03170-4426
TDS2514

63' : 03180-4408
DAM 786

69' : 03188-4418
RSS 63

72' : 03129-4314
DON 48

72' : 03111-4535
UC 962

72' : 03190-4411
R 26

72' : 03137-4536
I 1482

80' : 03140-4543
RST 62

81' : 03173-4324
HU 1354

82' : 03128-4547
RST 61

84' : 03046-4425
LDS3451

86' : 03195-4506
HU 1355

87' : 03196-4506
TDS2524

88' : 03169-4313
RST5199

94' : 03199-4514
B 1447AB

95' : 03200-4514
COO 18

103' : 03139-4244
TDS2488

107' : 03066-4259
UC 948

107' : 03153-4243
I 463

109' : 03040-4526
B 2079

110' : 03071-4252
DON 45

111' : 03217-4514
UC 992

117' : 03192-4557
KPP3518

118' : 03106-4621
I 1481



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.

03124-4425 HJ 3556 AB,C (HD 20121)

 
 
03h 12m 25.68s -44° 25' 10.8" P.A. 188.00 sep 3.7 mag 6.42,8.76 Sp F7III dist. 42.5 pc (138.64 l.y.)
 
 
Coord 2000 03124-4425 Discov num HJ 3556 Comp AB,C Coord arcsec 2000 03 12 25.68 -44 25 10.8
Date first 1848 Date last 2017 Obs 68
Pa first 238 Pa last 187.8 P.A. Now (θ) 187.8°
Sep first 1.8 Sep last 3.667 Sep. Now (ρ) 3.667"
Mag pri 6.42 Mag sec 8.76 delta mag (ΔM) 2.34 Spectral class F7III (yellow-white)
Pri motion ra +092 Sec motion ra +087
Pri motion dec -006 Sec motion dec -018
Notes N V (See Notes, Proper motion indicates physical)
rPM=0.141 (< 0.3, Physical double)
This double is physical.
 
 
03124-4425 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 216209 03 12 26 -44 25 11 JC 8 AB 2021 125 90 0.1 6.42 7.36 0.94 Y
Show HD 20121 216209 03 12 26 -44 25 11 HJ 3556 AB,C 2017 68 188 3.7 6.42 8.76 2.34 <===
Triple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 20121 Constellation Eridanus SAO 216209 HIP 14913
Tycho2 7567-01177-1 Gaia DR2 4850405974392311168 HD 20121 HR 968
CD CD-44 1025 CP CP-44 338 FK5 2228 Distance 42.5
Distance ly 138.64
 
 
WDS 03124-4425 HJ 3556 AB,C (HD 20121) : NOTES
 
 
discov_num notes refcode
JC 5 Ma,Mb = 1.365 +/- 0.031, 1.134 +/- 0.024 \msun. GmJ2022
JC 8 Variable RV of AB, not explained by the visual motion, has been
reported (Eggen 1965), but Heintz's mass ratio does not support Egg1965b
the presence of a fourth body. Hei1979a
AB: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 2.59 +/- 0.73, 2.18, and 3.82 Msun, respectively. Mlk2012
HJ 3556 AB,C: Star C (mag. 9.2, 3.5") is in slow retrograde motion.
Heintz (1979) gives AB orbit, attempts AC orbit with P=987yr. Hei1979a
The motion of AC is not directed away from PM(A), hence physical. Tok2014d
 
 
REFERENCES
 
 
refcode metd author reference
Egg1965b - Eggen, O.J. 1965Obs....85..191E
Egg1965b Observatory 85, 191, 1965
GmJ2022 orb j Gomez, J., Docobo, J.A., Campo, P.P., Andrade, M., Mendez, R.A. & Costa, E. 2022MNRAS.509.4229G
GmJ2022 +not MNRAS 509, 4229, 2022
Hei1979a orb - Heintz, W.D. 1979PASP...91..356H
Hei1979a PASP 91, 356, 1979
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Tok2014d E2 - Tokovinin, A. 2014AJ....147...86T
Tok2014d AJ 147, 86, 2014
 
 
DISCOVERER
 
 
idgroup discov author
1 HJ Herschel, J.F.W.
50 JC Jacob, W.S.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
03124-4425 HJ 3556 AB,C 2009 66 190 3.9 6.42 8.76 F5V N 031225.68-442510.8
03124-4425 HJ 3556 AB,C 2013 66 189 3.8 6.42 8.76 F5V N 031225.68-442510.8
03124-4425 HJ 3556 AB,C 2017 68 188 3.7 6.42 8.76 F7III NV 031225.68-442510.8

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

 
 
WDS 03124-4425 HJ 3556 AB,C (HD 20121) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 03124-4425 HJ 3556 AB,C (HD 20121) : MEASURES
 
 
No records found.

 
 
WDS 03124-4425 (HD 20121) : VIRTUAL EYEPIECE
 
 

03124-4425 JC 8A mag 6.42 Sp F7III 03124-4425 JC 8B mag 7.36 Sp A0V 03124-4425 HJ 3556C sep 3.6 P.A. 185.60 mag 8.76 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 03124-4425 (HD 20121) : ALADIN DSS IMAGE @ 03h 12m 25.68s -44° 25' 10.8"
 
 
 
 
WDS 03124-4425 HJ 3556 AB,C (HD 20121) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

03124-4425 JC 8AB distance=1' 03124-4425 HJ 3556AB,C distance=1' 03149-4458 TOI 914 distance=42' 03087-4413 HDS 398 distance=43' 03170-4426 TDS2514 distance=50' 03180-4408 DAM 786 distance=63' 03188-4418 RSS 63 distance=69' 03129-4314 DON 48 distance=72' 03111-4535 UC 962 distance=72' 03190-4411 R 26 distance=72' 03137-4536 I 1482 distance=72' 03140-4543 RST 62 distance=80' 03173-4324 HU 1354 distance=81' 03128-4547 RST 61 distance=82' 03046-4425 LDS3451 distance=84' 03195-4506 HU 1355 distance=86' 03196-4506 TDS2524 distance=87' 03169-4313 RST5199 distance=88' 03199-4514 B 1447AB distance=94' 03200-4514 COO 18 distance=95' 03139-4244 TDS2488 distance=103' 03066-4259 UC 948 distance=107' 03153-4243 I 463 distance=107' 03040-4526 B 2079 distance=109' 03071-4252 DON 45 distance=110' 03217-4514 UC 992 distance=111' 03192-4557 KPP3518 distance=117' 03106-4621 I 1481 distance=118' 03128-4226 DON 47 distance=120' 03069-4611 TDS2448 distance=121' 03168-4232 I 466AB distance=123' 03168-4232 I 466AC distance=123' 03049-4559 TDS2437 distance=124' 03081-4231 CPO 3 distance=124' 03186-4239 I 56 distance=127' 03113-4631 FAL 7 distance=127' 03075-4622 TDS2450 distance=128' 03009-4517 HDS 384 distance=134' 03206-4611 KPP1198 distance=137' 03253-4503 HU 1356 distance=142' 03005-4325 CPO 115 distance=143' 03246-4540 HJ 3576 distance=149' 02586-4444 DON 44 distance=150' 03249-4313 CBL 121 distance=154' 03262-4524 TDS2547 distance=158' 03074-4655 TSN 110 distance=159' 02590-4313 TVB 45 distance=163' 03273-4359 B 1452 distance=163' 03076-4702 TOK 206 distance=166' 03136-4712 SLR 4 distance=167' 02563-4440 DON1060 distance=174' 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 03124-4425 JC 8 AB 90 0.1 1
Show 03124-4425 HJ 3556 AB,C 188 3.7 1
Show 03149-4458 TOI 914 169 0.1 42
Show 03087-4413 HDS 398 89 0.1 43
Show 03170-4426 TDS2514 349 0.4 50
Show 03180-4408 DAM 786 299 8.1 63
Show 03188-4418 RSS 63 120 22.0 69
Show 03129-4314 DON 48 174 0.8 72
Show 03111-4535 UC 962 243 79.0 72
Show 03190-4411 R 26 243 58.6 72
Show 03137-4536 I 1482 336 7.0 72
Show 03140-4543 RST 62 202 1.5 80
Show 03173-4324 HU 1354 162 2.3 81
Show 03128-4547 RST 61 222 1.3 82
Show 03046-4425 LDS3451 244 12.4 84
Show 03195-4506 HU 1355 318 1.0 86
Show 03196-4506 TDS2524 352 0.9 87
Show 03169-4313 RST5199 59 0.5 88
Show 03199-4514 B 1447 AB 257 0.6 94
Show 03200-4514 COO 18 288 3.7 95
Show 03139-4244 TDS2488 239 0.7 103
Show 03066-4259 UC 948 266 94.5 107
Show 03153-4243 I 463 125 0.6 107
Show 03040-4526 B 2079 316 7.9 109
Show 03071-4252 DON 45 271 1.7 110
Show 03217-4514 UC 992 2 7.7 111
Show 03192-4557 KPP3518 71 1.6 117
Show 03106-4621 I 1481 197 2.7 118
Show 03128-4226 DON 47 294 0.7 120
Show 03069-4611 TDS2448 309 0.5 121
Show 03168-4232 I 466 AB 347 1.2 123
Show 03168-4232 I 466 AC 143 31.3 123
Show 03049-4559 TDS2437 132 0.9 124
Show 03081-4231 CPO 3 266 2.4 124
Show 03186-4239 I 56 257 3.9 127
Show 03113-4631 FAL 7 117 15.3 127
Show 03075-4622 TDS2450 96 0.6 128
Show 03009-4517 HDS 384 200 0.3 134
Show 03206-4611 KPP1198 80 9.3 137
Show 03253-4503 HU 1356 178 1.8 142
Show 03005-4325 CPO 115 185 6.6 143
Show 03246-4540 HJ 3576 342 2.8 149
Show 02586-4444 DON 44 345 2.3 150
Show 03249-4313 CBL 121 192 26.7 154
Show 03262-4524 TDS2547 149 1.0 158
Show 03074-4655 TSN 110 55 999.9 159
Show 02590-4313 TVB 45 229 6.0 163
Show 03273-4359 B 1452 258 0.9 163
Show 03076-4702 TOK 206 195 0.3 166
Show 03136-4712 SLR 4 259 0.7 167
Show 02563-4440 DON1060 351 5.6 174

 
 
WDS 03124-4425 : COMPONENTS
 
 
  A B
B pa=0.0°
sep=0.00"
 
C pa=185.6°
sep=3.65"
pa=186.7°
sep=3.66"
 
 
03124-4425 A
 
 
Coord arcsec 2000 031225.68-442510.8 Mag 6.42 Spectral class F7III (yellow-white) PmRA 92.00
PmDE -6.0 SAO 216209 HIP 14913 Tycho2 7567-01177-1
HD 20121 HR 968 GC 3845 CD CD-44 1025
CP CP-44 338 FK5 2228
Tycho2
Tycho2 7567-01177-1 Pflag RAmdeg 48.10730658 DEmdeg -44.41972130
PmRA 92.0 PmDE -6.2 E RAmdeg 4 E DEmdeg 4
E pmRA 0.9 E pmDE 0.8 EpRAm 1991.28 EpDEm 1991.28
Num 14 Q RAmdeg 1.2 Q DEmdeg 2.0 Q pmRA 1.3
Q pmDE 2.0 BTmag 6.574 E BTmag 0.014 VTmag 6.132
E VTmag 0.010 Prox 36 TYC T HIP 14913
CCDM AB RAdeg 48.10700889 DEdeg -44.41970694 EpRA 1990 1.67
EpDE 1990 1.73 E RAdeg 3.6 E DEdeg 3.5 Posflg P
Corr 0.1
SAO
SAO 216209 DelFlag RA1950 PmRA1950 0.0084
DE1950 PmDE1950 0.004 Vmag 5.9 SpType F2
Double code Source 70 CatNum 3845 DM CD-44 1025
DMcomp BDsup HD 20121 M HD 0
GC 3845 RA1950rad 0.83196245 DE1950rad -0.7785252 PmRA2000 0.0089
PmDE2000 -0.001
Hipparcos
Catalog H HIP 14913 Proxy H RAhms 03 12 25.68
DEdms -44 25 10.8 Vmag 5.92 VarFlag R Vmag G
RAdeg 48.107 DEdeg -44.4197 AstroRef A Plx 22.83
CCDM 03124-4425 N CCDM I Nsys 1 Ncomp 3
MultFlag C Source Qual B M HIP
Theta Rho HD 20121 BD
CD CD-44 1025 CP CP-44 338 Dm number -44 1025 VIred 0.51
SpType F3V+... R SpType Coord arcsec 2000 031225.68-442510.8
Hipparcos 2
HIP 14913 Sn 15 So 3 Nc 3
RArad 0.8396254644 DErad -0.7752692093 Plx 23.53 PmRA 81.63
PmDE -4.57 E RArad 0.4 E DErad 0.69 E Plx 0.62
E pmRA 0.55 E pmDE 0.98 Hpmag 6.0359 E Hpmag 0.0008
SHp 0.007 VA 0 BV 0.44 E BV 0.042
VI 0.51
CCDM
Ccdm 03124-4425 RComp Comp A Note1
Note2 Discov num DRAs 1.77 DDEs -11.1
R dRAs 10 Year Theta Rho
Obs 3 Vmag 6.6 Sp F2 PmNote *
PmRA 92 PmDE -8 Dm number -44 1025 Cat1 CD
Name2 216209 Cat2 SAO HD 20121 M HD
ADS BDS M ADS BDS N IDS IDS 03089S4448A
HIC 14913
 
 
03124-4425 B
 
 
Coord arcsec 2000 031225.69-442510.8 Mag 7.36 Spectral class A0V (white) PmRA 92.00
PmDE -6.0 Calc delta mag 0.94 Calc coord yes
CCDM
Ccdm 03124-4425 RComp Comp B Note1 *
Note2 Discov num JC 8 DRAs DDEs
R dRAs Year 1897 Theta Rho
Obs 99 Vmag 7.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 03089S4448B
HIC 14913
 
 
03124-4425 C
 
 
Coord arcsec 2000 031225.65-442514.4 Mag 8.76 PmRA 87.00 PmDE -18.0
Calc delta mag 2.34 Calc coord yes
CCDM
Ccdm 03124-4425 RComp Comp C Note1
Note2 Discov num HJ 3556 DRAs DDEs
R dRAs Year 1959 Theta 200 Rho 3.5
Obs 30 Vmag 9.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 03089S4448C
HIC 14913