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Current system
21198-2621
BU 271 AB
HD 202940


Nearby doubles
21' : 21188-2637
SEE 443

27' : 21181-2636
KPP 713

36' : 21179-2555
RST1086

39' : 21173-2601
UC 4428

56' : 21162-2651
RST2175

58' : 21200-2718
BU 252

59' : 21178-2714
STN 54

61' : 21229-2705
I 1441

66' : 21210-2725
UC 4451

69' : 21224-2523
TDT2932

73' : 21148-2555
HJ 3014

77' : 21242-2534
BU 1035

79' : 21157-2526
RST3281

84' : 21140-2650
RST2174

85' : 21212-2744
HDS3040

92' : 21257-2706
TDT2956

95' : 21166-2746
BRT3100

102' : 21215-2442
SEE 441AB

102' : 21125-2649
UC 4402

104' : 21140-2513
BRT3098

105' : 21127-2539
KPP1612

105' : 21136-2725
LDS5919

107' : 21244-2455
SPM 40

109' : 21136-2511
RST3278

113' : 21161-2802
LDS5920

114' : 21231-2806
HDS3047



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.

21198-2621 BU 271 AB (HD 202940)

 
 
21h 19m 45.62s -26° 21' 10.3" P.A. 24.00 sep 0.6 mag 6.73,9.76 Sp G5V dist. 17.97 pc (58.62 l.y.)
 
 
Coord 2000 21198-2621 Discov num BU  271 Comp AB Coord arcsec 2000 21 19 45.62 -26 21 10.3
Date first 1874 Date last 2021 Obs 58
Pa first 250 Pa last 24.2 P.A. Now (θ) 31.7°
Sep first 1.8 Sep last 0.642 Sep. Now (ρ) 0.678"
Mag pri 6.73 Mag sec 9.76 delta mag (ΔM) 3.03 Spectral class G5V (yellow)
Pri motion ra -582 Sec motion ra -541
Pri motion dec -358 Sec motion dec -336
Notes N O (See Notes, Orbital solution)
rPM=0.068 (< 0.3, Physical double)
This double is physical.
 
 
21198-2621 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 202940 190236 21 19 46 -26 21 10 BU 271 AB 2021 58 24 0.6 6.73 9.76 3.03 Y <===
Show 190236 21 19 46 -26 21 10 BU 271 AC 1999 5 67 141.7 6.73 14.35 7.62
Show 190236 21 19 46 -26 21 10 BU 271 AD 1999 3 61 298.6 6.73 12.15 5.42
Show 190236 21 19 46 -26 21 10 BU 271 AE 1999 3 32 180.4 6.73 13.82 7.09
Quintuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 202940 Constellation Capricornus SAO 190236 HIP 105312
Tycho2 6945-00785-1 HD 202940 HR 8148 GC 29832
ADS 14847 GL Gl 825.4A CD CD-2615541 CP CP-26 7193
Distance 17.97 Distance ly 58.62
 
 
ORBITAL ELEMENTS
 
 
Period (P)189.1y± 4.5 Periastron (T)1841.48y± 4.06 Semi-major axis (a)2.159a± 0.013
Eccentricity (e)0.631± 0.021 Inclination (i)65.2°± 0.4 Longitude of periastron (ω)190.5°± 3.8
Node (Ω)244.7°± 1.3 Notesn ReferenceTok2020e
Equinox Last observation Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 278.7 1.440
2001 280.2 1.381
2002 281.7 1.322
2003 283.5 1.263
2004 285.4 1.203
2005 287.5 1.144
2006 289.8 1.084
2007 292.4 1.025
2008 295.3 0.967
2009 298.6 0.910
2010 302.3 0.855
2011 306.5 0.802
2012 311.3 0.753
2013 316.7 0.708
2014 322.8 0.668
2015 329.7 0.634
2016 337.2 0.609
2017 345.2 0.592
2018 353.6 0.585
2019 2.0 0.588
2020 10.2 0.601
2021 17.9 0.621
2022 25.1 0.647
2023 31.7 0.678
2024 37.7 0.710
2025 43.2 0.741
2026 48.3 0.769
2027 53.0 0.790
2028 57.5 0.803
2029 62.0 0.806
2030 66.5 0.797


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


 
  


wds21198-2621d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 21198-2621 BU 271 AB (HD 202940) : NOTES
 
 
discov_num notes refcode
BU 271 A is a spectroscopic binary.
 
 
REFERENCES
 
 
refcode metd author reference
Tok2020e St j Tokovinin, A., Mason, B.D., Mendez, R.A., Costa, E. & Horch, E.P. 2020AJ....160....7T
Tok2020e +orb AJ 160, 7, 2020
 
 
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
21198-2621 BU 271 AB 1991 49 269 1.9 6.73 9.76 G5V NOD 211945.62-262110.3
21198-2621 BU 271 AB 2008 50 298 0.9 6.73 9.76 G5V NOD 211945.62-262110.3
21198-2621 BU 271 AB 2010 51 244 1.7 6.73 9.76 G5V NOD 211945.62-262110.3
21198-2621 BU 271 AB 2013 54 321 0.7 6.73 9.76 G5V NOD 211945.62-262110.3
21198-2621 BU 271 AB 2018 56 0 0.6 6.73 9.76 G5V NO 211945.62-262110.3
21198-2621 BU 271 AB 2019 56 6 0.6 6.73 9.76 G5V NO 211945.62-262110.3
21198-2621 BU 271 AB 2021 58 24 0.6 6.73 9.76 G5V NO 211945.62-262110.3

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

 
 
WDS 21198-2621 BU 271 AB (HD 202940) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21198-2621 BU 271 AB (HD 202940) : MEASURES
 
 
No records found.

 
 
WDS 21198-2621 (HD 202940) : VIRTUAL EYEPIECE
 
 

21198-2621 BU 271A mag 6.73 Sp G5V 21198-2621 BU 271B sep 0.6 P.A. 21.90 mag 9.76 21198-2621 BU 271C sep 129.3 P.A. 64.40 mag 14.35 21198-2621 BU 271D sep 275.3 P.A. 58.00 mag 12.15 21198-2621 BU 271E sep 175.3 P.A. 29.40 mag 13.82 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 21198-2621 (HD 202940) : ALADIN DSS IMAGE @ 21h 19m 45.62s -26° 21' 10.3"
 
 
 
 
WDS 21198-2621 BU 271 AB (HD 202940) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21198-2621 BU 271AB distance=0' 21188-2637 SEE 443 distance=21' 21181-2636 KPP 713 distance=27' 21179-2555 RST1086 distance=36' 21173-2601 UC 4428 distance=39' 21162-2651 RST2175 distance=56' 21200-2718 BU 252 distance=58' 21178-2714 STN 54 distance=59' 21229-2705 I 1441 distance=61' 21210-2725 UC 4451 distance=66' 21224-2523 TDT2932 distance=69' 21148-2555 HJ 3014 distance=73' 21242-2534 BU 1035 distance=77' 21157-2526 RST3281 distance=79' 21140-2650 RST2174 distance=84' 21212-2744 HDS3040 distance=85' 21257-2706 TDT2956 distance=92' 21166-2746 BRT3100 distance=95' 21215-2442 SEE 441AB distance=102' 21215-2442 SEE 441AC distance=102' 21125-2649 UC 4402 distance=102' 21140-2513 BRT3098 distance=104' 21127-2539 KPP1612 distance=105' 21136-2725 LDS5919 distance=105' 21244-2455 SPM 40 distance=107' 21136-2511 RST3278 distance=109' 21161-2802 LDS5920 distance=113' 21231-2806 HDS3047 distance=114' 21113-2632 TDT2811 distance=115' 21157-2803 BRT3099 distance=119' 21145-2444 UC 4417 distance=121' 21121-2735 HJ 3012 distance=127' 21124-2501 KPP3119 distance=128' 21194-2831 B 523 distance=130' 21100-2603 SEE 440 distance=133' 21105-2711 BRG 32 distance=134' 21218-2409 KPP 492 distance=135' 21277-2453 HJ 5271 distance=139' 21169-2836 DAW 154 distance=141' 21275-2446 LDS4886 distance=142' 21182-2355 HJ 3018 distance=147' 21251-2831 LDS5923 distance=150' 21154-2842 LDS4874 distance=153' 21187-2348 RSS 559 distance=154' 21195-2346 SEE 444 distance=155' 21078-2606 HTS 13 distance=162' 21146-2849 LDS4872 distance=164' 21266-2839 TDT2970 distance=165' 21325-2631 RST1093 distance=171' 21092-2447 I 1435 distance=172' 21131-2850 BRT3096 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 21198-2621 BU 271 AB 24 0.6
Show 21198-2621 BU 271 AC 67 141.7
Show 21198-2621 BU 271 AD 61 298.6
Show 21198-2621 BU 271 AE 32 180.4
Show 21188-2637 SEE 443 295 1.3 21
Show 21181-2636 KPP 713 34 6.3 27
Show 21179-2555 RST1086 162 0.4 36
Show 21173-2601 UC 4428 18 69.6 39
Show 21162-2651 RST2175 329 1.9 56
Show 21200-2718 BU 252 88 2.1 58
Show 21178-2714 STN 54 238 7.1 59
Show 21229-2705 I 1441 159 1.8 61
Show 21210-2725 UC 4451 203 24.7 66
Show 21224-2523 TDT2932 203 0.6 69
Show 21148-2555 HJ 3014 301 2.1 73
Show 21242-2534 BU 1035 214 0.8 77
Show 21157-2526 RST3281 112 3.1 79
Show 21140-2650 RST2174 11 0.6 84
Show 21212-2744 HDS3040 65 0.3 85
Show 21257-2706 TDT2956 239 0.5 92
Show 21166-2746 BRT3100 168 7.1 95
Show 21215-2442 SEE 441 AB 19 1.8 102
Show 21215-2442 SEE 441 AC 317 102.8 102
Show 21125-2649 UC 4402 325 36.0 102
Show 21140-2513 BRT3098 162 4.5 104
Show 21127-2539 KPP1612 181 12.3 105
Show 21136-2725 LDS5919 214 219.6 105
Show 21244-2455 SPM 40 107 42.4 107
Show 21136-2511 RST3278 239 0.6 109
Show 21161-2802 LDS5920 15 52.4 113
Show 21231-2806 HDS3047 103 0.1 114
Show 21113-2632 TDT2811 96 0.7 115
Show 21157-2803 BRT3099 298 4.4 119
Show 21145-2444 UC 4417 54 10.0 121
Show 21121-2735 HJ 3012 320 25.8 127
Show 21124-2501 KPP3119 6 6.5 128
Show 21194-2831 B 523 212 0.8 130
Show 21100-2603 SEE 440 38 9.1 133
Show 21105-2711 BRG 32 314 9.4 134
Show 21218-2409 KPP 492 227 3.9 135
Show 21277-2453 HJ 5271 44 6.5 139
Show 21169-2836 DAW 154 88 1.1 141
Show 21275-2446 LDS4886 240 52.1 142
Show 21182-2355 HJ 3018 350 14.7 147
Show 21251-2831 LDS5923 208 33.3 150
Show 21154-2842 LDS4874 34 22.5 153
Show 21187-2348 RSS 559 354 20.7 154
Show 21195-2346 SEE 444 260 9.0 155
Show 21078-2606 HTS 13 144 17.5 162
Show 21146-2849 LDS4872 276 62.7 164
Show 21266-2839 TDT2970 278 0.6 165

 
 
WDS 21198-2621 : COMPONENTS
 
 
  A B C D
B pa=21.9°
sep=0.63"
 
C pa=64.4°
sep=129.35"
pa=64.6°
sep=128.89"
 
D pa=58.0°
sep=275.33"
pa=58.1°
sep=274.82"
pa=52.5°
sep=147.48"
 
E pa=29.4°
sep=175.26"
pa=29.5°
sep=174.64"
pa=342.5°
sep=101.53"
pa=272.7°
sep=147.67"
 
 
21198-2621 A
 
 
Name HD 202940 Coord arcsec 2000 211945.62-262110.3 Mag 6.73 Spectral class G5V (yellow)
PmRA -582.00 PmDE -358.0 SAO 190236 HIP 105312
Tycho2 6945-00785-1 HD 202940 HR 8148 GC 29832
CD CD-2615541 CP CP-26 7193
Tycho2
Tycho2 6945-00785-1 Pflag RAmdeg 319.94013585 DEmdeg -26.35286136
PmRA -568.3 PmDE -353.7 E RAmdeg 10 E DEmdeg 5
E pmRA 1.5 E pmDE 1.5 EpRAm 1990.38 EpDEm 1991.55
Num 13 Q RAmdeg 1.2 Q DEmdeg 1.2 Q pmRA 1.3
Q pmDE 1.3 BTmag 7.528 E BTmag 0.019 VTmag 6.727
E VTmag 0.013 Prox 19 TYC T HIP 105312
CCDM A RAdeg 319.94166306 DEdeg -26.35205583 EpRA 1990 1.34
EpDE 1990 1.80 E RAdeg 9.5 E DEdeg 5.3 Posflg
Corr 0.1
SAO
SAO 190236 DelFlag RA1950 PmRA1950 -0.0402
DE1950 PmDE1950 -0.352 Vmag 6.5 SpType G5
Double code Source 70 CatNum 29832 DM CD-2615541
DMcomp BDsup HD 202940 M HD 0
GC 29832 RA1950rad 5.57141758 DE1950rad -0.46355909 PmRA2000 -0.0401
PmDE2000 -0.357
Hipparcos
Catalog H HIP 105312 Proxy H RAhms 21 19 46.00
DEdms -26 21 07.2 Vmag 6.56 VarFlag R Vmag G
RAdeg 319.942 DEdeg -26.352 AstroRef A Plx 53.4
CCDM 21198-2621 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 270 Rho 1.914 HD 202940 BD
CD CD-2615541 CP CP-26 7193 Dm number -2615541 VIred 0.85
SpType G5V R SpType Coord arcsec 2000 211946.00-262107.2
Hipparcos 2
HIP 105312 Sn 17 So 3 Nc 2
RArad 5.5840357912 DErad -0.4599293602 Plx 55.65 PmRA -582.58
PmDE -358.93 E RArad 0.54 E DErad 0.42 E Plx 0.62
E pmRA 0.78 E pmDE 0.52 Hpmag 6.6973 E Hpmag 0.0011
SHp 0.009 VA 0 BV 0.737 E BV 0.018
VI 0.85
CCDM
Ccdm 21198-2621 RComp Comp A Note1
Note2 Discov num DRAs -2.28 DDEs -12.7
R dRAs 41 Year Theta Rho
Obs 5 Vmag 6.6 Sp G4 PmNote *
PmRA -537 PmDE -352 Dm number -2615541 Cat1 CD
Name2 190236 Cat2 SAO HD 202940 M HD
ADS BDS A14847 M ADS BDS N IDS IDS 21140S2646A
HIC 105312
 
 
21198-2621 B
 
 
Coord arcsec 2000 211945.64-262109.7 Mag 9.76 PmRA -541.00 PmDE -336.0
Calc delta mag 3.03 Calc coord yes
CCDM
Ccdm 21198-2621 RComp Comp B Note1
Note2 Discov num BU 271 DRAs DDEs
R dRAs Year 1959 Theta 255 Rho 3.2
Obs 99 Vmag 9.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14847 M ADS BDS N IDS IDS 21140S2646B
HIC 105312
 
 
21198-2621 C
 
 
Coord arcsec 2000 211954.30-262014.5 Mag 14.35 PmRA 17.00 PmDE -15.0
Calc delta mag 7.62 Calc coord yes
CCDM
Ccdm 21198-2621 RComp Comp C Note1
Note2 Discov num BU 271 DRAs 7.34 DDEs 46.5
R dRAs 41 Year 1909 Theta 072 Rho 81.7
Obs 3 Vmag 12.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14847 M ADS BDS N IDS IDS 21140S2646C
HIC
 
 
21198-2621 D
 
 
Coord arcsec 2000 212003.00-261844.6 Mag 12.15 PmRA -10.00 PmDE -29.0
Calc delta mag 5.42 Calc coord yes
CCDM
Ccdm 21198-2621 RComp Comp D Note1
Note2 Discov num BU 271 DRAs 17.04 DDEs 137.2
R dRAs 41 Year 1917 Theta 62 Rho 247.2
Obs 1 Vmag 12.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14847 M ADS BDS N IDS IDS 21140S2646D
HIC
 
 
21198-2621 E
 
 
Coord arcsec 2000 211952.03-261837.7 Mag 13.82 PmRA -9.00 PmDE -7.0
Calc delta mag 7.09 Calc coord yes
CCDM
Ccdm 21198-2621 RComp Comp E Note1
Note2 Discov num BU 271 DRAs 8.82 DDEs 162.6
R dRAs 41 Year 1918 Theta 037 Rho 179.4
Obs 1 Vmag 12.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14847 M ADS BDS N IDS IDS 21140S2646E
HIC