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Current system
21143-3835
B 520 AB
HD 201991


Nearby doubles
24' : 21140-3858
TDT2844

27' : 21163-3845
LDS 737

36' : 21121-3811
HJ 5249

52' : 21187-3835
NSN 467

56' : 21176-3914
SEE 442

63' : 21142-3936
WG 267

78' : 21208-3847
CVN 110AB

81' : 21075-3842
WG 266

82' : 21178-3945
CRU9019AB

83' : 21196-3929
I 1438

83' : 21088-3927
CRU9015

87' : 21111-3717
COO 242

88' : 21097-3725
TDT2796

92' : 21065-3826
KIR 23

92' : 21136-3703
BRT1817

94' : 21107-3959
HDS3018

94' : 21221-3818
HDS3042

104' : 21087-3715
B 1895

105' : 21122-4016
CRU9018AB

109' : 21232-3800
LDS 741

109' : 21071-3944
KPP2409

110' : 21103-4014
CRU9017

110' : 21220-3733
B 525

111' : 21144-4025
UC 4416

118' : 21055-3933
TDT2734

126' : 21213-4011
WG 270



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Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

21143-3835 B 520 AB (HD 201991)

 
 
21h 14m 16.34s -38° 34' 40.6" P.A. 252.00 sep 0.8 mag 8.81,9.48 Sp F2 dist. 420.17 pc (1370.59 l.y.)
 
 
Coord 2000 21143-3835 Discov num B   520 Comp AB Coord arcsec 2000 21 14 16.34 -38 34 40.6
Date first 1926 Date last 2008 Obs 13
Pa first 242 Pa last 252.3 P.A. Now (θ) 252.3°
Sep first 0.9 Sep last 0.812 Sep. Now (ρ) 0.812"
Mag pri 8.81 Mag sec 9.48 delta mag (ΔM) 0.67 Spectral class F2 (yellow-white)
Pri motion ra -004 Sec motion ra -004
Pri motion dec -010 Sec motion dec -010
Notes
Nature of this double is uncertain.
 
 
21143-3835 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 201991 212815 21 14 16 -38 34 41 B 520 AB 2008 13 252 0.8 8.81 9.48 0.67 <===
Show 212815 21 14 16 -38 34 41 HJ 5253 AC 2015 13 183 10.4 8.81 9.53 0.72
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 201991 Constellation Microscopium SAO 212815 HIP 104835
Tycho2 7966-01198-1 Gaia DR2 6583524543613156352 HD 201991 CD CD-3914165
Distance 420.17 Distance ly 1370.59
 
 
WDS 21143-3835 B 520 AB (HD 201991) : NOTES
 
 
discov_num notes refcode
HJ 5253 AC: The C component was found to have a spectroscopic companion with a Tok2020h
period of 11d. The close AB pair, estimated period 1.3k yr, may be
responsible for proper motion differences, and this may be a physical
quadruple.
 
 
REFERENCES
 
 
refcode metd author reference
Tok2020h not j Tokovinin, A. 2020AJ....160...69T
Tok2020h AJ 160, 69, 2020
 
 
DISCOVERER
 
 
idgroup discov author
1 B van den Bos, W.H.
212 HJ Herschel, J.F.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21143-3835 B 520 AB 1991 12 248 0.8 8.81 9.48 F2 D 211416.34-383440.6
21143-3835 B 520 AB 2008 13 252 0.8 8.81 9.48 F2 D 211416.34-383440.6

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

 
 
WDS 21143-3835 B 520 AB (HD 201991) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21143-3835 B 520 AB (HD 201991) : MEASURES
 
 
No records found.

 
 
WDS 21143-3835 (HD 201991) : VIRTUAL EYEPIECE
 
 

21143-3835 B 520A mag 8.81 Sp F2 21143-3835 B 520B sep 0.7 P.A. 247.80 mag 9.48 21143-3835 HJ 5253C sep 10.4 P.A. 182.10 mag 9.53 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 21143-3835 (HD 201991) : ALADIN DSS IMAGE @ 21h 14m 16.34s -38° 34' 40.6"
 
 
 
 
WDS 21143-3835 B 520 AB (HD 201991) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21143-3835 B 520AB distance=0' 21140-3858 TDT2844 distance=24' 21163-3845 LDS 737 distance=27' 21121-3811 HJ 5249 distance=36' 21187-3835 NSN 467 distance=52' 21156-3927 HJ 5254A,BC distance=55' 21156-3927 B 521BC distance=56' 21176-3914 SEE 442 distance=56' 21142-3936 WG 267 distance=63' 21208-3847 CVN 110AB distance=78' 21075-3842 WG 266 distance=81' 21178-3945 CRU9019AB distance=82' 21178-3945 CRU9019AC distance=82' 21178-3945 TDT2890Ba,Bb distance=82' 21196-3929 I 1438 distance=83' 21088-3927 CRU9015 distance=83' 21111-3717 COO 242 distance=87' 21097-3725 TDT2796 distance=88' 21065-3826 KIR 23 distance=92' 21136-3703 BRT1817 distance=92' 21107-3959 HDS3018 distance=94' 21221-3818 HDS3042 distance=94' 21087-3715 B 1895 distance=104' 21122-4016 CRU9018AB distance=105' 21122-4016 CRU9018AC distance=105' 21122-4016 CRU9018AD distance=105' 21122-4016 CRU9018AE distance=105' 21122-4016 CRU9018AF distance=105' 21232-3800 LDS 741 distance=109' 21071-3944 KPP2409 distance=109' 21103-4014 CRU9017 distance=110' 21220-3733 B 525 distance=110' 21144-4025 UC 4416 distance=111' 21055-3933 TDT2734 distance=118' 21213-4011 WG 270 distance=126' 21236-3734 TDT2941 distance=127' 21162-4041 CBL 182 distance=129' 21251-3812 RST5478 distance=130' 21237-3947 SKF1173 distance=131' 21065-4012 WG 265 distance=132' 21114-3627 KPP2046 distance=133' 21030-3838 UC 4365 distance=133' 21029-3839 KPP4221CD distance=134' 21034-3748 TDT2717 distance=137' 21257-3913 SEE 445 distance=139' 21209-3639 B 1006 distance=140' 21176-3619 UC 4431 distance=142' 21241-4002 UC 4465 distance=144' 21091-4047 CPO 620AB distance=146' 21263-3801 B 2494 distance=146' 21232-3653 SUB 9 distance=148' 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 21143-3835 B 520 AB 252 0.8
Show 21143-3835 HJ 5253 AC 183 10.4
Show 21140-3858 TDT2844 69 0.5 24
Show 21163-3845 LDS 737 157 7.2 27
Show 21121-3811 HJ 5249 327 23.1 36
Show 21187-3835 NSN 467 290 36.2 52
Show 21156-3927 HJ 5254 A,BC 191 57.8 55
Show 21156-3927 B 521 BC 50 0.5 56
Show 21176-3914 SEE 442 40 4.9 56
Show 21142-3936 WG 267 318 10.0 63
Show 21208-3847 CVN 110 AB 25 7.0 78
Show 21075-3842 WG 266 299 3.4 81
Show 21178-3945 CRU9019 AB 230 117.1 82
Show 21178-3945 CRU9019 AC 62 62.8 82
Show 21178-3945 TDT2890 Ba,Bb 252 0.5 82
Show 21196-3929 I 1438 57 3.8 83
Show 21088-3927 CRU9015 88 23.6 83
Show 21111-3717 COO 242 239 5.2 87
Show 21097-3725 TDT2796 263 0.6 88
Show 21065-3826 KIR 23 143 42.8 92
Show 21136-3703 BRT1817 61 3.6 92
Show 21107-3959 HDS3018 189 0.8 94
Show 21221-3818 HDS3042 126 0.2 94
Show 21087-3715 B 1895 119 0.9 104
Show 21122-4016 CRU9018 AB 212 122.8 105
Show 21122-4016 CRU9018 AC 237 146.0 105
Show 21122-4016 CRU9018 AD 250 180.1 105
Show 21122-4016 CRU9018 AE 268 219.6 105
Show 21122-4016 CRU9018 AF 326 122.7 105
Show 21232-3800 LDS 741 290 8.9 109
Show 21071-3944 KPP2409 194 20.9 109
Show 21103-4014 CRU9017 303 25.0 110
Show 21220-3733 B 525 171 0.9 110
Show 21144-4025 UC 4416 140 12.5 111
Show 21055-3933 TDT2734 35 0.4 118
Show 21213-4011 WG 270 52 4.8 126
Show 21236-3734 TDT2941 97 0.4 127
Show 21162-4041 CBL 182 152 31.3 129
Show 21251-3812 RST5478 126 1.4 130
Show 21237-3947 SKF1173 153 94.0 131
Show 21065-4012 WG 265 64 10.0 132
Show 21114-3627 KPP2046 331 16.4 133
Show 21030-3838 UC 4365 207 99.7 133
Show 21029-3839 KPP4221 CD 265 4.5 134
Show 21034-3748 TDT2717 255 0.7 137
Show 21257-3913 SEE 445 216 2.3 139
Show 21209-3639 B 1006 151 5.7 140
Show 21176-3619 UC 4431 146 15.1 142
Show 21241-4002 UC 4465 50 38.1 144
Show 21091-4047 CPO 620 AB 347 20.1 146
Show 21263-3801 B 2494 324 8.2 146

 
 
WDS 21143-3835 : COMPONENTS
 
 
  A B
B pa=247.8°
sep=0.65"
 
C pa=182.1°
sep=10.42"
pa=178.8°
sep=10.17"
 
 
21143-3835 A
 
 
Name HD 201991 Coord arcsec 2000 211416.34-383440.6 Mag 8.81 Spectral class F2 (yellow-white)
PmRA -4.00 PmDE -10.0 SAO 212815 HIP 104835
Tycho2 7966-01198-1 HD 201991 CD CD-3914165
Tycho2
Tycho2 7966-01198-1 Pflag RAmdeg 318.56802675 DEmdeg -38.57797293
PmRA -4.1 PmDE -10.0 E RAmdeg 6 E DEmdeg 8
E pmRA 1.3 E pmDE 1.4 EpRAm 1991.20 EpDEm 1990.68
Num 9 Q RAmdeg 1.0 Q DEmdeg 2.1 Q pmRA 0.9
Q pmDE 2.2 BTmag 8.950 E BTmag 0.017 VTmag 8.451
E VTmag 0.013 Prox 104 TYC T HIP 104835
CCDM AB RAdeg 318.56803917 DEdeg -38.57794778 EpRA 1990 1.75
EpDE 1990 1.39 E RAdeg 5.5 E DEdeg 8.1 Posflg P
Corr -0.2
SAO
SAO 212815 DelFlag RA1950 PmRA1950 -0.0011
DE1950 PmDE1950 -0.036 Vmag 7.8 SpType F2
Double code Source 41 CatNum 10954 DM CD-3914165
DMcomp BDsup HD 201991 M HD 1
GC RA1950rad 5.54628417 DE1950rad -0.6769328 PmRA2000 -0.001
PmDE2000 -0.039
Hipparcos
Catalog H HIP 104835 Proxy H RAhms 21 14 16.34
DEdms -38 34 40.6 Vmag 8.31 VarFlag R Vmag G
RAdeg 318.568 DEdeg -38.5779 AstroRef A Plx -0.38
CCDM 21143-3835 N CCDM I Nsys 2 Ncomp 2
MultFlag C Source P Qual B M HIP AB
Theta 252 Rho 0.851 HD 201991 BD
CD CD-3914165 CP Dm number -3914165 VIred 0.52
SpType K2/K3III+.. R SpType Coord arcsec 2000 211416.34-383440.6
Hipparcos 2
HIP 104835 Sn 15 So 3 Nc 2
RArad 5.5600622171 DErad -0.6733119399 Plx 2.38 PmRA -7.65
PmDE -9.38 E RArad 2.12 E DErad 1.15 E Plx 3.33
E pmRA 3.97 E pmDE 1.19 Hpmag 8.0982 E Hpmag 0.0019
SHp 0.018 VA 0 BV 0.446 E BV 0.015
VI 0.52
CCDM
Ccdm 21143-3835 RComp Comp A Note1
Note2 Discov num DRAs -1.71 DDEs 18.1
R dRAs 41 Year Theta Rho
Obs 3 Vmag 8.7 Sp F2 PmNote *
PmRA -13 PmDE -36 Dm number -3914165 Cat1 CD
Name2 212815 Cat2 SAO HD 201991 M HD
ADS BDS M ADS BDS N IDS IDS 21079S3859A
HIC 104835
 
 
21143-3835 B
 
 
Coord arcsec 2000 211416.29-383440.8 Mag 9.48 PmRA -4.00 PmDE -10.0
Calc delta mag 0.67 Calc coord yes
CCDM
Ccdm 21143-3835 RComp Comp B Note1
Note2 Discov num B 520 DRAs DDEs
R dRAs Year 1926 Theta 247 Rho 0.9
Obs 9 Vmag 9.4 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 21079S3859B
HIC 104835
 
 
21143-3835 C
 
 
Coord arcsec 2000 211416.31-383451.0 Mag 9.53 PmRA -5.00 PmDE -12.0
HIP 104833 Tycho2 7966-01199-1 Calc delta mag 0.72 Calc coord yes
Tycho2
Tycho2 7966-01199-1 Pflag RAmdeg 318.56788886 DEmdeg -38.58086359
PmRA -5.0 PmDE -12.0 E RAmdeg 11 E DEmdeg 19
E pmRA 1.7 E pmDE 1.6 EpRAm 1991.22 EpDEm 1989.56
Num 6 Q RAmdeg 1.4 Q DEmdeg 1.3 Q pmRA 1.3
Q pmDE 1.3 BTmag 9.976 E BTmag 0.027 VTmag 9.527
E VTmag 0.025 Prox 104 TYC T HIP 104833
CCDM C RAdeg 318.56790361 DEdeg -38.58083444 EpRA 1990 1.80
EpDE 1990 1.34 E RAdeg 11.1 E DEdeg 19.3 Posflg D
Corr 0.0
Hipparcos
Catalog H HIP 104833 Proxy RAhms 21 14 16.30
DEdms -38 34 51.0 Vmag 8.12 VarFlag R Vmag H
RAdeg 318.568 DEdeg -38.5808 AstroRef C Plx -0.38
CCDM 21143-3835 N CCDM I Nsys 2 Ncomp 1
MultFlag C Source F Qual B M HIP
Theta Rho HD 201991 BD
CD CP Dm number VIred 0.46
SpType F2 R SpType Coord arcsec 2000 211416.30-383451.0
Hipparcos 2
HIP 104833 Sn 15 So 3 Nc 1
RArad 5.5600591297 DErad -0.6733625694 Plx -118.14 PmRA -90.46
PmDE -92.22 E RArad 20.94 E DErad 12.39 E Plx 25.76
E pmRA 33.29 E pmDE 10.72 Hpmag 8.2148 E Hpmag 0.0223
SHp 0.168 VA 0 BV 0.42 E BV 0.072
VI 0.46
CCDM
Ccdm 21143-3835 RComp Comp C Note1
Note2 Discov num HJ 5253 DRAs -1.72 DDEs 8.3
R dRAs 41 Year 1904 Theta 183 Rho 10.4
Obs 3 Vmag 9.2 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 21079S3859C
HIC 104833