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Current system
20557-6609
HDS 2981 AB
HD 198678


Nearby doubles
13' : 20553-6557
DAM1257

19' : 20552-6550
LDS 728

25' : 20594-6558
MLO 91

28' : 20598-6621
TDT2683

37' : 20515-6543
HJ 5221

38' : 20513-6542
UC 4309

44' : 20492-6550
TDT2562

48' : 20573-6655
TDT2657

54' : 20478-6546
TDT2544

60' : 21026-6651
TDT2709

85' : 20459-6710
TDT2524

87' : 20490-6453
UC 4298

87' : 21032-6723
DON 997

91' : 21032-6452
TDT2715

92' : 21081-6702
HJ 5240

92' : 20411-6638
NZO 102

93' : 20559-6742
TDT2637

95' : 20404-6551
KPP4210

98' : 21117-6621
FAL 71

99' : 21119-6617
HDS3020

99' : 20527-6432
HDS2974

100' : 20560-6748
TDT2639

110' : 20432-6730
LDS 718

112' : 20472-6749
DON 991

112' : 20496-6427
DAW 229AB

114' : 20370-6623
TDT2424



Selections
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20557-6609 HDS 2981 AB (HD 198678)

 
 
20h 55m 40.79s -66° 08' 59.7" P.A. 243.00 sep 0.1 mag 8.17,9.00 Sp G3V dist. 101.52 pc (331.16 l.y.)
 
 
Coord 2000 20557-6609 Discov num HDS2981 Comp AB Coord arcsec 2000 20 55 40.79 -66 08 59.7
Date first 1991 Date last 2021 Obs 8
Pa first 31 Pa last 242.5 P.A. Now (θ) 242.5°
Sep first 0.1 Sep last 0.076 Sep. Now (ρ) 0.076"
Mag pri 8.17 Mag sec 9.00 delta mag (ΔM) 0.83 Spectral class G3V (yellow)
Pri motion ra -002 Sec motion ra
Pri motion dec -005 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
20557-6609 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 198678 254899 20 55 41 -66 08 60 HDS 2981 AB 2021 8 243 0.1 8.17 9.00 0.83 Y <===
Show 254899 20 55 41 -66 08 60 HDS 2981 AC 2021 1 172 1.3 8.17 14.50 6.33
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 198678 Constellation Pavo SAO 254899 HIP 103302
Tycho2 9113-00624-1 HD 198678 CP CP-66 3510 Distance 101.52
Distance ly 331.16
 
 
SUSPECTED ORBITAL ELEMENTS
 
 
Identifier20557-6609 HDS2981
coord_arcsec_2000205540.79-660859.7
Period (P)19.32y Periastron (T)2023.33y Semi-major axis (a)0.099a
Eccentricity (e)0.35 Inclination (i)156.4° Longitude of periastron (ω)191.1°
Node (Ω)16.9° Notes ReferenceTok2021c
Equinox2000 Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 301.8 0.094
2001 281.6 0.083
2002 255.7 0.073
2003 223.7 0.067
2004 187.1 0.064
2005 149.0 0.065
2006 114.9 0.072
2007 88.5 0.083
2008 68.9 0.096
2009 53.8 0.108
2010 41.6 0.118
2011 31.1 0.126
2012 21.6 0.131
2013 12.6 0.133
2014 3.8 0.133
2015 354.7 0.130
2016 345.1 0.125
2017 334.5 0.117
2018 322.2 0.108
2019 307.3 0.097
2020 288.7 0.086
2021 264.7 0.076
2022 234.6 0.069
2023 199.2 0.065
2024 161.1 0.064
2025 125.1 0.069
2026 96.1 0.079
2027 74.6 0.092
2028 58.3 0.104
2029 45.3 0.115
2030 34.3 0.124


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


 
  


wds20557-6609a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 20557-6609 HDS 2981 AB (HD 198678) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
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
20557-6609 HDS2981 AB 2021 8 243 0.1 8.17 9.00 G3V O 205540.79-660859.7

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

 
 
WDS 20557-6609 HDS 2981 AB (HD 198678) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20557-6609 HDS 2981 AB (HD 198678) : MEASURES
 
 
No records found.

 
 
WDS 20557-6609 (HD 198678) : VIRTUAL EYEPIECE
 
 

20557-6609 HDS2981A mag 8.17 Sp G3V 20557-6609 HDS2981B mag 9 20557-6609 HDS2981C sep 1.3 P.A. 176.70 mag 14.5 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 20557-6609 (HD 198678) : ALADIN DSS IMAGE @ 20h 55m 40.79s -66° 08' 59.7"
 
 
 
 
WDS 20557-6609 HDS 2981 AB (HD 198678) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20557-6609 HDS2981AB distance=0' 20553-6557 DAM1257 distance=13' 20552-6550 LDS 728 distance=19' 20594-6558 MLO 91 distance=25' 20598-6621 TDT2683 distance=28' 20515-6543 HJ 5221 distance=37' 20513-6542 UC 4309 distance=38' 20492-6550 TDT2562 distance=44' 20573-6655 TDT2657 distance=48' 20478-6546 TDT2544 distance=54' 21026-6651 TDT2709 distance=60' 20446-6630 TOK 918Aa,Ab distance=71' 20459-6710 TDT2524 distance=85' 20490-6453 UC 4298 distance=87' 21032-6723 DON 997 distance=87' 21032-6452 TDT2715 distance=91' 21081-6702 HJ 5240 distance=92' 20411-6638 NZO 102 distance=92' 20559-6742 TDT2637 distance=93' 20404-6551 KPP4210 distance=95' 21117-6621 FAL 71 distance=98' 21119-6617 HDS3020 distance=99' 20527-6432 HDS2974 distance=99' 20560-6748 TDT2639 distance=100' 20432-6730 LDS 718 distance=110' 20472-6749 DON 991 distance=112' 20496-6427 DAW 229AB distance=112' 20496-6427 BAU 64AC distance=112' 20496-6427 BAU 64AD distance=112' 20370-6623 TDT2424 distance=114' 21110-6724 LDS 733 distance=118' 21156-6609 TDT2866 distance=121' 20549-6810 UC 4322 distance=121' 21100-6447 RST1083 distance=121' 20371-6523 UC 4233 distance=124' 20361-6705 CBL 179 distance=130' 20579-6359 TSN 36AB distance=132' 21096-6754 LDS 732 distance=133' 21061-6411 TDT2746 distance=136' 20416-6427 UC 4259 distance=136' 20397-6436 FAB 16 distance=137' 20444-6411 B 994 distance=138' 20370-6455 TSN 35 distance=138' 20398-6430 HJ 5217 distance=141' 20535-6348 LDS 726 distance=142' 20489-6353 HU 1620 distance=143' 20407-6411 HU 1616 distance=151' 21146-6429 UC 4419 distance=156' 21129-6407 RSS 555 distance=164' 20489-6847 SHY 782 distance=164' 20423-6348 TDT2483 distance=165' 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 20557-6609 HDS2981 AB 243 0.1
Show 20557-6609 HDS2981 AC 172 1.3
Show 20553-6557 DAM1257 104 87.1 13
Show 20552-6550 LDS 728 253 277.9 19
Show 20594-6558 MLO 91 242 17.0 25
Show 20598-6621 TDT2683 186 2.4 28
Show 20515-6543 HJ 5221 44 10.3 37
Show 20513-6542 UC 4309 344 30.7 38
Show 20492-6550 TDT2562 279 0.5 44
Show 20573-6655 TDT2657 126 0.7 48
Show 20478-6546 TDT2544 158 0.5 54
Show 21026-6651 TDT2709 213 0.7 60
Show 20446-6630 TOK 918 Aa,Ab 336 0.1 71
Show 20459-6710 TDT2524 164 0.4 85
Show 20490-6453 UC 4298 57 10.8 87
Show 21032-6723 DON 997 61 2.5 87
Show 21032-6452 TDT2715 294 1.8 91
Show 21081-6702 HJ 5240 203 11.8 92
Show 20411-6638 NZO 102 141 10.1 92
Show 20559-6742 TDT2637 246 0.5 93
Show 20404-6551 KPP4210 53 1.5 95
Show 21117-6621 FAL 71 97 22.2 98
Show 21119-6617 HDS3020 80 0.3 99
Show 20527-6432 HDS2974 31 1.0 99
Show 20560-6748 TDT2639 325 0.9 100
Show 20432-6730 LDS 718 309 29.1 110
Show 20472-6749 DON 991 76 2.3 112
Show 20496-6427 DAW 229 AB 136 7.7 112
Show 20496-6427 BAU 64 AC 305 49.8 112
Show 20496-6427 BAU 64 AD 161 51.0 112
Show 20370-6623 TDT2424 19 1.8 114
Show 21110-6724 LDS 733 51 71.1 118
Show 21156-6609 TDT2866 157 0.5 121
Show 20549-6810 UC 4322 10 16.8 121
Show 21100-6447 RST1083 8 0.5 121
Show 20371-6523 UC 4233 2 9.3 124
Show 20361-6705 CBL 179 107 24.7 130
Show 20579-6359 TSN 36 AB 122 260.3 132
Show 21096-6754 LDS 732 179 4.2 133
Show 21061-6411 TDT2746 330 0.4 136
Show 20416-6427 UC 4259 191 13.9 136
Show 20397-6436 FAB 16 358 20.0 137
Show 20444-6411 B 994 193 0.8 138
Show 20370-6455 TSN 35 73 35.3 138
Show 20398-6430 HJ 5217 232 7.7 141
Show 20535-6348 LDS 726 195 7.5 142
Show 20489-6353 HU 1620 271 1.3 143
Show 20407-6411 HU 1616 68 0.7 151
Show 21146-6429 UC 4419 176 55.6 156
Show 21129-6407 RSS 555 95 8.2 164
Show 20489-6847 SHY 782 107 999.9 164

 
 
WDS 20557-6609 : COMPONENTS
 
 
  A B
B pa=217.8°
sep=0.04"
 
C pa=176.7°
sep=1.30"
pa=175.4°
sep=1.27"
 
 
20557-6609 A
 
 
Name HD 198678 Coord arcsec 2000 205540.79-660859.7 Mag 8.17 Spectral class G3V (yellow)
PmRA -2.00 PmDE -5.0 SAO 254899 HIP 103302
Tycho2 9113-00624-1 HD 198678 CP CP-66 3510
Tycho2
Tycho2 9113-00624-1 Pflag RAmdeg 313.91995541 DEmdeg -66.14992671
PmRA -0.5 PmDE -1.6 E RAmdeg 4 E DEmdeg 4
E pmRA 1.4 E pmDE 1.6 EpRAm 1991.24 EpDEm 1991.38
Num 11 Q RAmdeg 0.8 Q DEmdeg 0.8 Q pmRA 0.7
Q pmDE 0.7 BTmag 8.389 E BTmag 0.016 VTmag 7.700
E VTmag 0.010 Prox 999 TYC T HIP 103302
CCDM AB RAdeg 313.91995778 DEdeg -66.14992278 EpRA 1990 1.49
EpDE 1990 1.55 E RAdeg 4.3 E DEdeg 4.2 Posflg P
Corr 0.2
SAO
SAO 254899 DelFlag RA1950 PmRA1950 0.0002
DE1950 PmDE1950 -0.054 Vmag 8.3 SpType A0
Double code Source 61 CatNum 4480 DM CP-66 3510
DMcomp BDsup HD 198678 M HD 0
GC RA1950rad 5.45972122 DE1950rad -1.15788758 PmRA2000 -0.0012
PmDE2000 -0.055
Hipparcos
Catalog H HIP 103302 Proxy H RAhms 20 55 40.79
DEdms -66 08 59.7 Vmag 7.62 VarFlag R Vmag H
RAdeg 313.92 DEdeg -66.1499 AstroRef * Plx 11.75
CCDM 20557-6609 N CCDM H Nsys 1 Ncomp 2
MultFlag C Source S Qual A M HIP AB
Theta 31 Rho 0.121 HD 198678 BD
CD CP CP-66 3510 Dm number -66 3510 VIred 0.69
SpType G3V R SpType Coord arcsec 2000 205540.79-660859.7
Hipparcos 2
HIP 103302 Sn 55 So 3 Nc 2
RArad 5.4789368038 DErad -1.1545339885 Plx 9.85 PmRA -1.23
PmDE -5.76 E RArad 0.52 E DErad 0.54 E Plx 0.88
E pmRA 0.67 E pmDE 0.72 Hpmag 7.7537 E Hpmag 0.001
SHp 0.012 VA 0 BV 0.618 E BV 0.007
VI 0.69
CCDM
Ccdm 20557-6609 RComp Comp A Note1
Note2 Discov num DRAs -1.21 DDEs 0.2
R dRAs 82 Year Theta Rho
Obs 2 Vmag 8.2 Sp G3 PmNote *
PmRA -2 PmDE -5 Dm number -66 3510 Cat1 CPD
Name2 254899 Cat2 SAO HD 198678 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 103302
 
 
20557-6609 B
 
 
Coord arcsec 2000 205540.79-660859.7 Mag 9 Calc delta mag 0.83 Calc coord yes
CCDM
Ccdm 20557-6609 RComp Comp B Note1
Note2 Discov num HDS DRAs -1.20 DDEs 0.3
R dRAs 82 Year 1991 Theta 31 Rho 0.1
Obs 1 Vmag 9.0 Sp PmNote *
PmRA -2 PmDE -5 Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS
HIC 103302
 
 
20557-6609 C
 
 
Coord arcsec 2000 205540.80-660901.0 Mag 14.5 Calc delta mag 6.33 Calc coord yes