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Current system
21176+8231
STF 2807
HD 204372


Nearby doubles
22' : 21170+8210
LOC 482

22' : 21164+8210
LDS1949

45' : 21370+8255
STF2837

45' : 21354+8300
LDS1956

48' : 21239+8317
HDS3049

49' : 21196+8143
AZC 180

53' : 21322+8316
TDT3014

59' : 21147+8133
LOC 478

62' : 21060+8134
LOC 480

67' : 21236+8337
LOC 491

72' : 21118+8121
LOC 571AB

75' : 21060+8121
PKO 31

78' : 21157+8114
MLR 245

87' : 21105+8356
LOC 481

103' : 21210+8413
MLR 247

107' : 21066+8048
TOK 632

107' : 21235+8417
SKF 397AB

124' : 21070+8030
LOC 479

126' : 21211+8436
MLR 248

130' : 21185+8021
STF2801

151' : 21152+8501
LOC 483

151' : 21357+8459
LOC 492

167' : 21223+7945
MLR 246

175' : 21249+7938
LOC 489

197' : 21010+7919
MLR 244

210' : 21217+7902
UC 4456



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.

21176+8231 STF 2807 (HD 204372)

 
 
21h 17m 33.47s +82° 31' 03.7" P.A. 310.00 sep 1.8 mag 8.65,8.77 Sp F8 dist. 75.02 pc (244.72 l.y.)
 
 
Coord 2000 21176+8231 Discov num STF2807 Comp Coord arcsec 2000 21 17 33.47 +82 31 03.7
Date first 1829 Date last 2019 Obs 46
Pa first 315 Pa last 309.5 P.A. Now (θ) 309.5°
Sep first 1.9 Sep last 1.785 Sep. Now (ρ) 1.785"
Mag pri 8.65 Mag sec 8.77 delta mag (ΔM) 0.12 Spectral class F8 (yellow-white)
Pri motion ra +012 Sec motion ra +012
Pri motion dec +082 Sec motion dec +082
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 204372 Constellation Cepheus SAO 3550 HIP 105112
Tycho2 4649-00045-1 Gaia DR2 2298698382656425216 HD 204372 GC 29930
ADS 14921 BD BD+81 737 Distance 75.02 Distance ly 244.72
 
 
ORBITAL ELEMENTS
 
 
Period (P)2818.9854y± 1456.9941 Periastron (T)1641.0222y± 501.3932 Semi-major axis (a)6.15221a± 4.16702
Eccentricity (e)0.80384± 0.1589 Inclination (i)91.733°± 3.879 Longitude of periastron (ω)108.438°± 25.004
Node (Ω)136.406°± 5.633 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 310.7 1.851
2001 310.7 1.847
2002 310.7 1.842
2003 310.7 1.838
2004 310.6 1.833
2005 310.6 1.829
2006 310.6 1.825
2007 310.6 1.820
2008 310.5 1.816
2009 310.5 1.811
2010 310.5 1.807
2011 310.5 1.802
2012 310.4 1.798
2013 310.4 1.793
2014 310.4 1.789
2015 310.3 1.784
2016 310.3 1.780
2017 310.3 1.775
2018 310.3 1.770
2019 310.2 1.766
2020 310.2 1.761
2021 310.2 1.757
2022 310.2 1.752
2023 310.1 1.748
2024 310.1 1.743
2025 310.1 1.738
2026 310.0 1.734
2027 310.0 1.729
2028 310.0 1.725
2029 310.0 1.720
2030 309.9 1.715


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


 
  


wds21176%2B8231a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 21176+8231 STF 2807 (HD 204372) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Izm2019 orb u Izmailov, I.S. 2019AstL...45...30I
Izm2019 Ast. Lett. 45, 30, 2019
Izm2019 (Orbital elements from weighted solutions used when available (Table 2),
Izm2019 unweighted elements (Table 1) used for remaining 29 systems.)
 
 
DISCOVERER
 
 
idgroup discov author
1 STF Struve, F.G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21176+8231 STF2807 2005 39 311 1.8 8.65 8.77 F8 D 211733.47+823103.7
21176+8231 STF2807 2011 41 307 1.8 8.65 8.77 F8 211733.47+823103.7
21176+8231 STF2807 2016 42 311 1.8 8.65 8.77 F8 211733.47+823103.7
21176+8231 STF2807 2019 45 310 1.8 8.65 8.77 F8 O 211733.47+823103.7

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

 
 
WDS 21176+8231 STF 2807 (HD 204372) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21176+8231 STF 2807 (HD 204372) : MEASURES
 
 
No records found.

 
 
WDS 21176+8231 (HD 204372) : VIRTUAL EYEPIECE
 
 

21176+8231 STF2807A mag 8.65 Sp F8 21176+8231 STF2807B sep 1.1 P.A. 351.00 mag 8.77 virtual eyepiece
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Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 21176+8231 (HD 204372) : ALADIN DSS IMAGE @ 21h 17m 33.47s +82° 31' 03.7"
 
 
 
 
WDS 21176+8231 STF 2807 (HD 204372) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21176+8231 STF2807 distance=1' 21170+8210 LOC 482 distance=22' 21164+8210 LDS1949 distance=22' 21370+8255 STF2837 distance=45' 21354+8300 LDS1956 distance=45' 21239+8317 HDS3049 distance=48' 21196+8143 AZC 180 distance=49' 21322+8316 TDT3014 distance=53' 21147+8133 LOC 478 distance=59' 21060+8134 LOC 480 distance=62' 21236+8337 LOC 491 distance=67' 21118+8121 LOC 571BC distance=72' 21118+8121 LOC 571AB distance=72' 21118+8121 LOC 571AC distance=72' 21060+8121 PKO 31 distance=75' 21157+8114 MLR 245 distance=78' 21105+8356 LOC 481 distance=87' 21210+8413 MLR 247 distance=103' 21066+8048 TOK 632 distance=107' 21235+8417 SKF 397AB distance=107' 21070+8030 LOC 479 distance=124' 21211+8436 MLR 248 distance=126' 21185+8021 STF2801 distance=130' 21152+8501 LOC 483 distance=151' 21357+8459 LOC 492 distance=151' 21223+7945 MLR 246 distance=167' 21249+7938 LOC 489 distance=175' 21207+7916 LDS1950AC distance=195' 21010+7919 MLR 244 distance=197' 21217+7902 UC 4456 distance=210' 21290+7901 TDT2985 distance=213' 21021+7855 LOC 477 distance=219' 21156+7836 STF2796 distance=236' 21278+7830 LOC 487 distance=243' 21037+7827 KPP4222 distance=247' 21271+7822 UC 4469 distance=250' 20592+7823 CON 38 distance=252' 21312+8652 STF2858 distance=262' 21202+7804 KPP4234 distance=268' 21285+8700 HDS3057 distance=270' 21288+7756 HU 771 distance=277' 21089+7752 LOC 476 distance=280' 21276+7744 LOC 486 distance=289' 21341+7740 LOC 484 distance=295' 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 21176+8231 STF2807 310 1.8 1
Show 21170+8210 LOC 482 75 1.7 22
Show 21164+8210 LDS1949 106 15.4 22
Show 21370+8255 STF2837 269 3.2 45
Show 21354+8300 LDS1956 351 62.2 45
Show 21239+8317 HDS3049 339 0.3 48
Show 21196+8143 AZC 180 6 52.1 49
Show 21322+8316 TDT3014 217 1.6 53
Show 21147+8133 LOC 478 333 1.5 59
Show 21060+8134 LOC 480 285 3.1 62
Show 21236+8337 LOC 491 64 1.1 67
Show 21118+8121 LOC 571 BC 259 13.6 72
Show 21118+8121 LOC 571 AB 87 12.7 72
Show 21118+8121 LOC 571 AC 199 2.1 72
Show 21060+8121 PKO 31 119 9.6 75
Show 21157+8114 MLR 245 41 1.2 78
Show 21105+8356 LOC 481 15 21.0 87
Show 21210+8413 MLR 247 301 2.1 103
Show 21066+8048 TOK 632 53 999.9 107
Show 21235+8417 SKF 397 AB 200 3.7 107
Show 21070+8030 LOC 479 209 3.5 124
Show 21211+8436 MLR 248 107 0.5 126
Show 21185+8021 STF2801 271 2.1 130
Show 21152+8501 LOC 483 274 36.1 151
Show 21357+8459 LOC 492 314 1.9 151
Show 21223+7945 MLR 246 47 3.1 167
Show 21249+7938 LOC 489 31 1.5 175
Show 21207+7916 LDS1950 AC 287 5.3 195
Show 21010+7919 MLR 244 188 2.5 197
Show 21217+7902 UC 4456 353 30.2 210
Show 21290+7901 TDT2985 212 0.5 213
Show 21021+7855 LOC 477 275 3.4 219
Show 21156+7836 STF2796 42 26.7 236
Show 21278+7830 LOC 487 256 2.1 243
Show 21037+7827 KPP4222 264 2.0 247
Show 21271+7822 UC 4469 188 9.1 250
Show 20592+7823 CON 38 237 2.5 252
Show 21312+8652 STF2858 157 14.4 262
Show 21202+7804 KPP4234 212 3.6 268
Show 21285+8700 HDS3057 278 0.4 270
Show 21288+7756 HU 771 193 2.6 277
Show 21089+7752 LOC 476 53 1.2 280
Show 21276+7744 LOC 486 337 4.2 289
Show 21341+7740 LOC 484 235 10.4 295

 
 
WDS 21176+8231 : COMPONENTS
 
 
  A
B pa=351.0°
sep=1.15"
 
 
21176+8231 A
 
 
Componente originario normalizzato AB Name HD 204372 Coord arcsec 2000 211733.47+823103.7 Mag 8.65
Spectral class F8 (yellow-white) PmRA 12.00 PmDE 82.0 SAO 3550
HIP 105112 Tycho2 4649-00045-1 HD 204372 GC 29930
BD BD+81 737
Tycho2
Tycho2 4649-00045-1 Pflag P RAmdeg 319.38945513 DEmdeg 82.51769270
PmRA 11.8 PmDE 82.4 E RAmdeg 8 E DEmdeg 9
E pmRA 2.4 E pmDE 2.5 EpRAm 1991.62 EpDEm 1991.56
Num 3 Q RAmdeg 1.1 Q DEmdeg 0.1 Q pmRA 1.1
Q pmDE 0.1 BTmag 9.187 E BTmag 0.018 VTmag 8.651
E VTmag 0.014 Prox 19 TYC T HIP 105112
CCDM A RAdeg 319.39053528 DEdeg 82.51735361 EpRA 1990 1.73
EpDE 1990 1.71 E RAdeg 7.1 E DEdeg 7.5 Posflg D
Corr 0.0
SAO
SAO 3550 DelFlag RA1950 PmRA1950 0.0103
DE1950 PmDE1950 0.087 Vmag 7.8 SpType F8
Double code Source 70 CatNum 29930 DM BD+81 737
DMcomp BDsup HD 204372 M HD 0
GC 29930 RA1950rad 5.58677031 DE1950rad 1.43648089 PmRA2000 0.0098
PmDE2000 0.083
Hipparcos
Catalog H HIP 105112 Proxy H RAhms 21 17 33.73
DEdms +82 31 02.4 Vmag 7.91 VarFlag R Vmag G
RAdeg 319.391 DEdeg 82.5173 AstroRef A Plx 12.82
CCDM 21176+8231 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 311 Rho 1.909 HD 204372 BD BD+81 737
CD CP Dm number +81 737 VIred 0.62
SpType F8 R SpType Coord arcsec 2000 211733.73+823102.4
Hipparcos 2
HIP 105112 Sn 15 So 3 Nc 2
RArad 5.574416406 DErad 1.4401993183 Plx 13.33 PmRA 12.35
PmDE 78.75 E RArad 0.75 E DErad 0.72 E Plx 0.81
E pmRA 1.4 E pmDE 0.72 Hpmag 8.0212 E Hpmag 0.0012
SHp 0.011 VA 0 BV 0.551 E BV 0.015
VI 0.62
CCDM
Ccdm 21176+8231 RComp Comp A Note1
Note2 Discov num DRAs -2.94 DDEs 4.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 8.5 Sp F8 PmNote *
PmRA -5 PmDE 94 Dm number +81 737 Cat1 BD
Name2 +82 624 Cat2 AGK2/3 HD 204372 M HD
ADS BDS A14921 M ADS BDS N IDS IDS 21231N8205A
HIC 105112
 
 
21176+8231 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 211733.38+823104.8 Mag 8.77 PmRA 12.00
PmDE 82.0 HIP 105112 Tycho2 4649-00045-2 Calc delta mag 0.12
Calc coord yes
Tycho2
Tycho2 4649-00045-2 Pflag P RAmdeg 319.38945513 DEmdeg 82.51769270
PmRA 11.8 PmDE 82.4 E RAmdeg 8 E DEmdeg 9
E pmRA 2.4 E pmDE 2.5 EpRAm 1991.62 EpDEm 1991.56
Num 3 Q RAmdeg 1.1 Q DEmdeg 0.1 Q pmRA 1.1
Q pmDE 0.1 BTmag 9.358 E BTmag 0.019 VTmag 8.771
E VTmag 0.014 Prox 19 TYC T HIP 105112
CCDM B RAdeg 319.38752611 DEdeg 82.51770222 EpRA 1990 1.74
EpDE 1990 1.70 E RAdeg 8.0 E DEdeg 8.5 Posflg D
Corr 0.0
Hipparcos
Catalog H HIP 105112 Proxy H RAhms 21 17 33.73
DEdms +82 31 02.4 Vmag 7.91 VarFlag R Vmag G
RAdeg 319.391 DEdeg 82.5173 AstroRef A Plx 12.82
CCDM 21176+8231 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 311 Rho 1.909 HD 204372 BD BD+81 737
CD CP Dm number +81 737 VIred 0.62
SpType F8 R SpType Coord arcsec 2000 211733.73+823102.4
Hipparcos 2
HIP 105112 Sn 15 So 3 Nc 2
RArad 5.574416406 DErad 1.4401993183 Plx 13.33 PmRA 12.35
PmDE 78.75 E RArad 0.75 E DErad 0.72 E Plx 0.81
E pmRA 1.4 E pmDE 0.72 Hpmag 8.0212 E Hpmag 0.0012
SHp 0.011 VA 0 BV 0.551 E BV 0.015
VI 0.62
CCDM
Ccdm 21176+8231 RComp Comp B Note1
Note2 Discov num STF2807 DRAs DDEs
R dRAs Year 1944 Theta 313 Rho 2.1
Obs 15 Vmag 8.6 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14921 M ADS BDS N IDS IDS 21231N8205B
HIC 105112