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Current system
20205+4351
BU 1207 AB


Nearby doubles
13' : 20211+4341
A 46AB

18' : 20212+4335
HJ 1505

29' : 20224+4332
TDT2215

30' : 20187+4329
TDT2158

32' : 20210+4320
TDT2198

32' : 20231+4405
TDT2227

39' : 20190+4316
WFC 231

41' : 20169+4337
FOX 252

43' : 20179+4319
ES 1440

45' : 20167+4335
FOX 251

45' : 20165+4339
ES 1439

46' : 20195+4307
TDS1059

46' : 20210+4437
A 725

48' : 20229+4311
L 34

53' : 20253+4355
A 291AB

54' : 20157+4339
A 2095AB

57' : 20219+4257
BRT2262

59' : 20229+4259
HO 128AB

62' : 20166+4437
TDT2135

63' : 20237+4442
ES 1330

63' : 20161+4432
BRT2258

66' : 20159+4307
BRT2257

67' : 20266+4350
TDT2273

68' : 20267+4353
FYM 258AB

70' : 20188+4244
HO 124

70' : 20194+4500
TDS1058



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.

20205+4351 BU 1207 AB

 
 
20h 20m 27.98s +43° 51' 16.3" P.A. 211.00 sep 4.8 mag 6.85,14.40 Sp WC6/7 dist. 4000 pc (13048 l.y.)
 
 
Coord 2000 20205+4351 Discov num BU 1207 Comp AB Coord arcsec 2000 20 20 27.98 +43 51 16.3
Date first 1890 Date last 2015 Obs 10
Pa first 218 Pa last 210.6 P.A. Now (θ) 210.6°
Sep first 5.8 Sep last 4.783 Sep. Now (ρ) 4.783"
Mag pri 6.85 Mag sec 14.40 delta mag (ΔM) 7.55 Spectral class WC6/7 (Wolf-Rayet)
Pri motion ra -003 Sec motion ra
Pri motion dec -008 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
20205+4351 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show V1687 Cyg 49491 20 20 28 +43 51 16 IOT 2 Aa,Ab 2019 11 152 0.0 6.10 6.30 0.20 Y
Show 49491 20 20 28 +43 51 16 BU 1207 AB 2015 10 211 4.8 6.85 14.40 7.55 <===
Show 49491 20 20 28 +43 51 16 TRN 29 AC 2001 1 202 2.3 6.85 16.00 9.15
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name V1687 Cyg Constellation Cygnus SAO 49491 HIP 100287
Tycho2 3164-01678-1 Gaia DR2 2081261372633822592 HD 193793 GC 28303
BD BD+43 3571 Distance 4000 Distance ly 13048
 
 
WDS 20205+4351 BU 1207 AB : NOTES
 
 
discov_num notes refcode
IOT 2 Aa,Ab: Monnier et al (2011) derive a distance of 1.67 +/- 0.03 kpc;
masses for the WR and O star are 14.9 +/ 0.5 and 35.9 +/- 1.3 \msun,
respectively. CIA2011d
Aa,Ab: Thomas et al. (2021) derive a distance of 1.518 +/- 0.021 kpc;
masses for the WR and O star of 10.31 +/- 0.45 & 29.27 +/- 1.14 \msun;
and semi-axis major of 13.55 +/- 0.21 AU. CIA2021a
BU 1207 Spectrum: WC6/7+O5/6; classification from Smith (1968 MNRAS 138, 109). Msn1998a
Variable, V1687 Cyg = WR 140. Large IR variations associated with
circumstellar dust shell.
May be a long-period spectroscopic binary.
AB and TRN 29AC: The image rotator was in an unknown state, so no
theta values were determined for the 2001.7447 observations. Trn2008
Dust forms near periastron and quickly dissipates. Polarization appears IAU2014b
related to the dust formation.
 
 
REFERENCES
 
 
refcode metd author reference
CIA2011d orb j Monnier, J.D., Zhao, M., Pedretti, E., Millan-Gabet, R., Berger, J.-P., Traub, W., 2011ApJ...742L...1M
CIA2011d +Kc Schloerb, F.P., ten Brummelaar, T., McAlister, H., Ridgway, S., Sturmann, L.,
CIA2011d +K Sturmann, J., et al.
CIA2011d ApJ 742, L1, 2011 (see also IOT2011)
CIA2021a Kc j Thomas, J.D., Richardson, N.D., Eldridge, J.J., Schaefer, G., Monnier, J.D., 2021MNRAS.504.5221T
CIA2021a +orb Sana, H., Moffat, A.F.J., Williams, P., Corcoran, M.F., Stevens, I.R., Weigelt, G.,
CIA2021a +not Zainol, F.D., Anugu, N., Le Bouquin, J.-B., ten Brumelaar, T.A., Campos, F., et al.
CIA2021a MNRAS 504, 5221, 2021
IAU2014b - Lomax, J. (IAU Symposium 307, in press) .
Msn1998a Sc j Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G., 1998AJ....115..821M
Msn1998a ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a AJ 115, 821, 1998
Trn2008 Ac j Turner, N.H., ten Brummelaar, T.A., Roberts, L.C., Mason, B.D., Hartkopf, W.I., & 2008AJ....136..554T
Trn2008 +E2 Gies, D.R.
Trn2008 +A AJ 136, 554, 2008
Trn2008 (Note: For some observations the image derotator was in an unknown state. In these
Trn2008 cases the theta value is either left blank or two possible values are listed - one
Trn2008 for zenith up and one for north up. For unresolved objects, the listed rho value
Trn2008 is the FWHM of the corrected stellar PSF. Larger FWHM values are indicative of
Trn2008 poorer seeing and/or non-optimal AO system tuning.)
 
 
DISCOVERER
 
 
idgroup discov author
1 BU Burnham, S.W. (BU 1 - 81)
179 IOT IOTA Array
181 IOT Monnier, J.D., Traub, W.A., Schloerb, F.P., Millan-Gabet, R., Berger, J.-P.,
181 IOT Pedretti, E., Carleton, N.P., Kraus, S., Lacasse, M.G., Brewer, M., Ragland, S.,
181 IOT Ahearn, A., et al.
182 IOT Kraus, S., Schloerb, F.P., Traub, W.A., Carleton, N.P., Lacasse, M., Pearlman, M.,
182 IOT Monnier, J.D., Millan-Gabet, R., et al.
183 IOT Kraus, S., Balega, Y.Y., Berger, J.-P., Hofmann, K.-H., Millan-Gabat, R.,
183 IOT Monnier, J.D., Ohnaka, K., Pedretti, E., et al.
184 IOT Pedretti, E., Monnier, J.D., Lacour, S., Traub, W.A., Danchi, W.C., Tuthill, P.G.,
184 IOT Thureau, N.D., Millan-Gabet, R., et al.
185 IOT Monnier, J.D., Zhao, M., Pedretti, E., Millan-Gabet, R., Berger, J.-P., Traub, W.,
185 IOT Schloerb, F.P., ten Brummelaar, T., McAlister, H., Ridgway, S., Sturmann, L.,
185 IOT Sturmann, J., et al.
186 IOT Berger, J.-P., Monnier, J.D., Millan-Gabet. R., Renard, S., Pedretti, E.,
186 IOT Traub, W., Bechet, C., Benisty, M., et al.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20205+4351 BU 1207 AB 2002 8 210 4.8 6.85 14.40 N 202027.98+435116.3
20205+4351 BU 1207 AB 2008 9 211 4.8 6.85 14.40 N 202027.98+435116.3
20205+4351 BU 1207 AB 2015 10 211 4.8 6.85 14.40 WC6/7 N 202027.98+435116.3

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

 
 
WDS 20205+4351 BU 1207 AB : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20205+4351 BU 1207 AB : MEASURES
 
 
No records found.

 
 
WDS 20205+4351 : VIRTUAL EYEPIECE
 
 

20205+4351 BU 1207A mag 6.85 Sp WC6/7 20205+4351 IOT 2Ab mag 6.3 Sp O 20205+4351 BU 1207B sep 4.5 P.A. 203.10 mag 14.4 20205+4351 TRN 29C sep 2.2 P.A. 196.20 mag 16 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 20205+4351 : ALADIN DSS IMAGE @ 20h 20m 27.98s +43° 51' 16.3"
 
 
 
 
WDS 20205+4351 BU 1207 AB : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20205+4351 BU 1207AB distance=0' 20211+4341 A 46AB distance=13' 20211+4341 A 46AB,C distance=13' 20212+4335 HJ 1505 distance=18' 20224+4332 TDT2215 distance=29' 20187+4329 TDT2158 distance=30' 20210+4320 TDT2198 distance=32' 20231+4405 TDT2227 distance=32' 20190+4316 WFC 231 distance=39' 20169+4337 FOX 252 distance=41' 20179+4319 ES 1440 distance=43' 20167+4335 FOX 251 distance=45' 20165+4339 ES 1439 distance=45' 20195+4307 TDS1059 distance=46' 20210+4437 A 725 distance=46' 20229+4311 L 34 distance=48' 20253+4355 A 291AB distance=53' 20253+4355 A 291AC distance=53' 20157+4339 A 2095AB distance=54' 20157+4339 STF2659AB,C distance=54' 20157+4339 STF2659AB,D distance=54' 20157+4339 FOX 39DE distance=54' 20157+4339 A 2095DF distance=54' 20219+4257 BRT2262 distance=57' 20229+4259 HO 128AB distance=59' 20229+4259 STTA207AC distance=59' 20229+4259 STTA207CD distance=59' 20166+4437 TDT2135 distance=62' 20237+4442 ES 1330 distance=63' 20161+4432 BRT2258 distance=63' 20159+4307 BRT2257 distance=66' 20266+4350 TDT2273 distance=67' 20267+4353 FYM 258AB distance=68' 20267+4353 FYM 258AC distance=68' 20267+4353 FYM 258AD distance=68' 20188+4244 HO 124 distance=70' 20194+4500 TDS1058 distance=70' 20229+4243 A 289AB distance=73' 20229+4243 A 289AC distance=73' 20159+4257 ROE 42 distance=74' 20240+4457 ES 1331 distance=76' 20137+4323 BU 660AB distance=79' 20137+4323 BU 660AC distance=79' 20137+4323 FOX 250AD distance=79' 20156+4454 TDT2125 distance=82' 20272+4437 BRT2264 distance=86' 20151+4249 A 388 distance=86' 20189+4227 HJ 1503 distance=86' 20275+4307 TDT2289 distance=89' 20130+4433 A 723 distance=91' 20198+4522 STT 406 distance=91' 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 20205+4351 BU 1207 AB 211 4.8
Show 20205+4351 TRN 29 AC 202 2.3
Show 20205+4351 IOT 2 Aa,Ab 152 0.0
Show 20211+4341 A 46 AB 77 0.4 13
Show 20211+4341 A 46 AB,C 265 2.0 13
Show 20212+4335 HJ 1505 111 16.7 18
Show 20224+4332 TDT2215 91 0.9 29
Show 20187+4329 TDT2158 164 1.8 30
Show 20210+4320 TDT2198 3 1.8 32
Show 20231+4405 TDT2227 172 0.5 32
Show 20190+4316 WFC 231 331 7.4 39
Show 20169+4337 FOX 252 246 18.6 41
Show 20179+4319 ES 1440 256 2.6 43
Show 20167+4335 FOX 251 279 5.5 45
Show 20165+4339 ES 1439 30 1.7 45
Show 20195+4307 TDS1059 117 0.9 46
Show 20210+4437 A 725 25 0.9 46
Show 20229+4311 L 34 174 4.5 48
Show 20253+4355 A 291 AB 148 0.8 53
Show 20253+4355 A 291 AC 284 18.1 53
Show 20157+4339 A 2095 AB 333 0.2 54
Show 20157+4339 STF2659 AB,C 311 2.7 54
Show 20157+4339 STF2659 AB,D 251 20.5 54
Show 20157+4339 FOX 39 DE 135 1.4 54
Show 20157+4339 A 2095 DF 48 7.6 54
Show 20219+4257 BRT2262 129 2.5 57
Show 20229+4259 HO 128 AB 357 1.4 59
Show 20229+4259 STTA207 AC 65 85.8 59
Show 20229+4259 STTA207 CD 162 56.1 59
Show 20166+4437 TDT2135 38 0.9 62
Show 20237+4442 ES 1330 309 3.6 63
Show 20161+4432 BRT2258 6 2.8 63
Show 20159+4307 BRT2257 101 3.4 66
Show 20266+4350 TDT2273 211 0.5 67
Show 20267+4353 FYM 258 AB 345 17.2 68
Show 20267+4353 FYM 258 AC 244 37.4 68
Show 20267+4353 FYM 258 AD 100 24.8 68
Show 20188+4244 HO 124 357 0.9 70
Show 20194+4500 TDS1058 250 1.4 70
Show 20229+4243 A 289 AB 154 3.9 73
Show 20229+4243 A 289 AC 351 70.5 73
Show 20159+4257 ROE 42 91 6.1 74
Show 20240+4457 ES 1331 78 1.3 76
Show 20137+4323 BU 660 AB 318 8.7 79
Show 20137+4323 BU 660 AC 190 58.2 79
Show 20137+4323 FOX 250 AD 279 31.5 79
Show 20156+4454 TDT2125 257 2.3 82
Show 20272+4437 BRT2264 4 3.0 86
Show 20151+4249 A 388 36 0.7 86
Show 20189+4227 HJ 1503 73 16.9 86
Show 20275+4307 TDT2289 346 2.0 89

 
 
WDS 20205+4351 : COMPONENTS
 
 
  A Ab B
Ab pa=159.3°
sep=0.01"
 
B pa=203.1°
sep=4.48"
pa=203.2°
sep=4.47"
 
C pa=196.2°
sep=2.21"
pa=196.4°
sep=2.20"
pa=29.7°
sep=2.30"
 
 
20205+4351 A
 
 
Coord arcsec 2000 202027.98+435116.3 Mag 6.85 Spectral class WC6/7 (Wolf-Rayet) PmRA -3.00
PmDE -8.0 SAO 49491 HIP 100287 Tycho2 3164-01678-1
HD 193793 GC 28303 BD BD+43 3571
Tycho2
Tycho2 3164-01678-1 Pflag RAmdeg 305.11656507 DEmdeg 43.85452155
PmRA -5.3 PmDE -2.2 E RAmdeg 4 E DEmdeg 4
E pmRA 1.1 E pmDE 1.1 EpRAm 1991.46 EpDEm 1991.51
Num 15 Q RAmdeg 1.0 Q DEmdeg 1.0 Q pmRA 0.9
Q pmDE 1.1 BTmag 7.379 E BTmag 0.015 VTmag 6.926
E VTmag 0.010 Prox 999 TYC T HIP 100287
CCDM RAdeg 305.11658250 DEdeg 43.85452611 EpRA 1990 1.74
EpDE 1990 1.73 E RAdeg 3.9 E DEdeg 4.0 Posflg
Corr 0.0
SAO
SAO 49491 DelFlag RA1950 PmRA1950 -0.0005
DE1950 PmDE1950 -0.007 Vmag 6.8 SpType Oa
Double code Source 70 CatNum 28303 DM BD+43 3571
DMcomp BDsup HD 193793 M HD 0
GC 28303 RA1950rad 5.31792678 DE1950rad 0.76262598 PmRA2000 -0.0002
PmDE2000 -0.009
Hipparcos
Catalog H HIP 100287 Proxy RAhms 20 20 27.98
DEdms +43 51 16.3 Vmag 6.78 VarFlag R Vmag G
RAdeg 305.117 DEdeg 43.8545 AstroRef Plx 0.62
CCDM 20205+4351 N CCDM I Nsys 1 Ncomp 1
MultFlag Source Qual M HIP
Theta Rho HD 193793 BD BD+43 3571
CD CP Dm number +43 3571 VIred 0.53
SpType WC+... R SpType Coord arcsec 2000 202027.98+435116.3
Hipparcos 2
HIP 100287 Sn 5 So 0 Nc 1
RArad 5.3252890026 DErad 0.7654058748 Plx 0.25 PmRA -5.2
PmDE -1.63 E RArad 0.35 E DErad 0.27 E Plx 0.42
E pmRA 0.37 E pmDE 0.33 Hpmag 6.8898 E Hpmag 0.0013
SHp 0.01 VA 0 BV 0.461 E BV 0.002
VI 0.53
CCDM
Ccdm 20205+4351 RComp Comp A Note1
Note2 Discov num DRAs -2.06 DDEs 15.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 6.8 Sp OA PmNote *
PmRA -12 PmDE -12 Dm number +43 3571 Cat1 BD
Name2 +43 1809 Cat2 AGK2/3 HD 193793 M HD
ADS BDS A13736 M ADS BDS N IDS IDS 20171N4332A
HIC 100287
 
 
20205+4351 Ab
 
 
Coord arcsec 2000 202027.98+435116.3 Mag 6.3 Spectral class O (blue) Calc delta mag 0.2
Calc coord yes
 
 
20205+4351 B
 
 
Coord arcsec 2000 202027.82+435112.2 Mag 14.4 Calc delta mag 8.3 Calc coord yes
CCDM
Ccdm 20205+4351 RComp Comp B Note1
Note2 Discov num BU 1207 DRAs DDEs
R dRAs Year 1890 Theta 217 Rho 5.8
Obs 5 Vmag 14.4 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A13736 M ADS BDS N IDS IDS 20171N4332B
HIC 100287
 
 
20205+4351 C
 
 
Coord arcsec 2000 202027.92+435114.2 Mag 16 Calc delta mag 9.9 Calc coord yes