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Doubles in session


Current system
21243+3740
WSI 7
HD 203940


Nearby doubles
2' : 21241+3741
SEI1458

20' : 21238+3721
STFA 55AB

21' : 21226+3744
COU1820

23' : 21228+3754
WIS 349

23' : 21233+3801
ES 2519

26' : 21221+3734
ES 2517

30' : 21249+3711
TDS1126

32' : 21268+3731
SEI1516AB

32' : 21233+3810
ALI 690

34' : 21252+3708
SEI1513

36' : 21250+3814
TDT2950

38' : 21272+3752
ES 2520

38' : 21264+3712
SEI1514

39' : 21215+3719
ROE 24AB

43' : 21231+3821
ALI 689

48' : 21257+3824
TDT2955

49' : 21278+3715
SEI1518

50' : 21284+3745
TDT2983

55' : 21231+3647
ES 2124

55' : 21287+3755
KPP1064

57' : 21195+3745
TDT2904

58' : 21202+3818
PTT 18

58' : 21239+3837
GRV 461

62' : 21215+3648
TDT2919

63' : 21258+3640
S 790AB

64' : 21295+3728
SEI1519



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.

21243+3740 WSI 7 (HD 203940)

 
 
21h 24m 16.13s +37° 39' 44.2" P.A. 44.00 sep 0.1 mag 7.81, Sp G5 dist. 48.5 pc (158.21 l.y.)
 
 
Coord 2000 21243+3740 Discov num WSI   7 Comp Coord arcsec 2000 21 24 16.13 +37 39 44.2
Date first 1999 Date last 2012 Obs 5
Pa first 55 Pa last 43.5 P.A. Now (θ) 43.5°
Sep first 0.1 Sep last 0.116 Sep. Now (ρ) 0.116"
Mag pri 7.81 Mag sec delta mag (ΔM) Spectral class G5 (yellow)
Pri motion ra +145 Sec motion ra
Pri motion dec +008 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 203940 Constellation Cygnus SAO 71288 HIP 105676
Tycho2 3182-04068-1 Gaia DR2 1964029072058622464 HD 203940 BD BD+37 4295
Distance 48.5 Distance ly 158.21
 
 
ORBITAL ELEMENTS
 
 
Period (P)17.8y± 1.9 Periastron (T)2014.6y± 1.3 Semi-major axis (a)0.167a± 0.015
Eccentricity (e)0.31± 0.1 Inclination (i)122.1°± 4.8 Longitude of periastron (ω)285.6°± 7.4
Node (Ω)247.3°± 7.8 Notes ReferenceRAO2015
Equinox2000 Last observation2012 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 232.6 0.148
2001 219.3 0.143
2002 204.1 0.131
2003 185.6 0.119
2004 164.4 0.114
2005 143.0 0.118
2006 124.4 0.131
2007 109.6 0.147
2008 97.7 0.163
2009 87.6 0.174
2010 78.4 0.176
2011 68.9 0.167
2012 57.2 0.143
2013 38.2 0.103
2014 352.7 0.064
2015 288.1 0.081
2016 259.2 0.121
2017 243.2 0.144
2018 230.1 0.148
2019 216.5 0.140
2020 200.7 0.128
2021 181.6 0.117
2022 160.0 0.114
2023 139.0 0.120
2024 121.2 0.134
2025 107.0 0.150
2026 95.6 0.165
2027 85.8 0.175
2028 76.6 0.176
2029 66.8 0.164
2030 54.3 0.136


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


 
  


wds21243%2B3740a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 21243+3740 WSI 7 (HD 203940) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
RAO2015 Ag u Riddle, R.L., Tokovinin, A., Mason, B.D., Hartkopf, W.I., Roberts, L.C., Jr., 2015ApJ...799....4R
RAO2015 +orb Baranec, C., Law, N.M., Bui, K., Burse, M.P., Das, H.K., Dekany, R.G.,
RAO2015 Kulkarni, S., Punnadi, S., Ramaprakash, A.N., & Tendulkar, S.P.
RAO2015 ApJ 799, 4, 2015
RAO2015 (Note: Paper includes separation/magnitude difference limits for all stars
RAO2015 observed. These limits have been added to the Interferometric Catalog even for
RAO2015 resolved pairs, to indicate restrictions on any potential additional components.)
 
 
DISCOVERER
 
 
idgroup discov author
1 WSI Douglass, G.G., Hindsley, R.B., & Worley, C.E.
10 WSI Mason, B.D., Hartkopf, W.I., Holdenried, E.R., Rafferty, T.J., Wycoff, G.L.,
10 WSI Hennessy, G.S., Hall, D.M., Urban, S.E., et al.
13 WSI Mason, B.D., Hartkopf, W.I., Wycoff, G.L., Holdenried, E.R., Platais, I.,
13 WSI Rafferty, T.J., Hall, D.M., Hennessy, G.S., et al.
14 WSI Mason, B.D., Hartkopf, W.I., Urban, S.E., Wycoff, G.L., Pascu, D., Hall, D.M.,
14 WSI Hennessy, G.S., Platais, I., et al.
15 WSI Mason, B.D., Hartkopf, W.I., Wycoff, G.L., Pascu, D., Urban, S.E., Hall, D.M.,
15 WSI Hennessy, G.S., Rafferty, T.J., et al.
42 WSI Mason, B.D., Hartkopf, W.I., Bredthauer, G., Ferguson, E.W., Finch, C.T., Kilian,
42 WSI C.M., Rafferty, T.J., Ragan, T.J. & Wieder, G.D.
52 WSI Mason, B.D., Williams, S.J., Matson, R.A., Josties, J.D., Eakens, P.D., Justice,
52 WSI M., Kilian, C.M. & Warner, R.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21243+3740 WSI 7 1999 1 55 0.1 7.81   G5 212416.13+373944.2
21243+3740 WSI 7 2008 3 95 0.2 7.81   G5 212416.13+373944.2
21243+3740 WSI 7 2009 4 80 0.2 7.81   G5 212416.13+373944.2
21243+3740 WSI 7 2012 5 44 0.1 7.81   G5 212416.13+373944.2

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

 
 
WDS 21243+3740 WSI 7 (HD 203940) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21243+3740 WSI 7 (HD 203940) : MEASURES
 
 
No records found.

 
 
WDS 21243+3740 (HD 203940) : VIRTUAL EYEPIECE
 
 

21243+3740 WSI 7A mag 7.81 Sp G5 21243+3740 WSI 7B sep 0.1 P.A. 36.90 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 21243+3740 (HD 203940) : ALADIN DSS IMAGE @ 21h 24m 16.13s +37° 39' 44.2"
 
 
 
 
WDS 21243+3740 WSI 7 (HD 203940) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21243+3740 WSI 7 distance=0' 21241+3741 SEI1458 distance=2' 21238+3721 STFA 55AB distance=20' 21238+3721 STFA 55AC distance=20' 21238+3721 STFA 55AF distance=20' 21226+3744 COU1820 distance=21' 21238+3721 STFA 55CD distance=22' 21238+3721 STFA 55CE distance=22' 21228+3754 WIS 349 distance=23' 21233+3801 ES 2519 distance=23' 21221+3734 ES 2517 distance=26' 21249+3711 TDS1126 distance=30' 21268+3731 COU1821Da,Db distance=31' 21268+3731 SEI1516AB distance=32' 21268+3731 HEI9004AC distance=32' 21268+3731 HEI9004AD distance=32' 21233+3810 ALI 690 distance=32' 21252+3708 SEI1513 distance=34' 21250+3814 TDT2950 distance=36' 21272+3752 ES 2520 distance=38' 21264+3712 SEI1514 distance=38' 21215+3719 ROE 24AB distance=39' 21215+3719 ROE 24AD distance=39' 21215+3719 ROE 24AC distance=39' 21215+3719 ROE 23CD distance=40' 21231+3821 ALI 689 distance=43' 21257+3824 TDT2955 distance=48' 21278+3715 SEI1518 distance=49' 21284+3745 TDT2983 distance=50' 21231+3647 ES 2124 distance=55' 21287+3755 KPP1064 distance=55' 21195+3745 TDT2904 distance=57' 21202+3818 PTT 18 distance=58' 21239+3837 GRV 461 distance=58' 21215+3648 TDT2919 distance=62' 21258+3640 S 790AB distance=63' 21258+3640 S 790AC distance=63' 21258+3640 FYM 124CD distance=63' 21295+3728 SEI1519 distance=64' 21199+3815 ES 2062 distance=64' 21194+3814 HO 286AB distance=68' 21194+3814 CIA 5Aa,Ab distance=68' 21194+3814 KRV 42AC distance=68' 21245+3632 ES 2125AB distance=69' 21245+3632 SEI1512AC distance=69' 21226+3846 HDS3044 distance=69' 21278+3835 KU 61AB distance=70' 21278+3835 KU 61AC distance=70' 21278+3835 KU 61AD distance=70' 21247+3631 ES 2126AB distance=70' 21247+3631 WSI 23AC distance=70' 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 21243+3740 WSI 7 44 0.1
Show 21241+3741 SEI1458 312 7.9 2
Show 21238+3721 STFA 55 AB 304 364.1 20
Show 21238+3721 STFA 55 AC 154 178.3 20
Show 21238+3721 STFA 55 AF 201 22.8 20
Show 21226+3744 COU1820 319 1.4 21
Show 21238+3721 STFA 55 CD 183 12.8 22
Show 21238+3721 STFA 55 CE 320 17.7 22
Show 21228+3754 WIS 349 176 44.9 23
Show 21233+3801 ES 2519 224 6.5 23
Show 21221+3734 ES 2517 115 5.3 26
Show 21249+3711 TDS1126 314 1.9 30
Show 21268+3731 COU1821 Da,Db 96 0.7 31
Show 21268+3731 SEI1516 AB 335 3.9 32
Show 21268+3731 HEI9004 AC 275 25.5 32
Show 21268+3731 HEI9004 AD 335 109.8 32
Show 21233+3810 ALI 690 65 8.8 32
Show 21252+3708 SEI1513 90 14.5 34
Show 21250+3814 TDT2950 200 1.6 36
Show 21272+3752 ES 2520 238 6.2 38
Show 21264+3712 SEI1514 184 12.0 38
Show 21215+3719 ROE 24 AB 168 10.3 39
Show 21215+3719 ROE 24 AD 266 81.7 39
Show 21215+3719 ROE 24 AC 266 68.7 39
Show 21215+3719 ROE 23 CD 261 13.1 40
Show 21231+3821 ALI 689 107 14.6 43
Show 21257+3824 TDT2955 18 0.5 48
Show 21278+3715 SEI1518 143 15.5 49
Show 21284+3745 TDT2983 111 0.5 50
Show 21231+3647 ES 2124 263 7.6 55
Show 21287+3755 KPP1064 246 8.5 55
Show 21195+3745 TDT2904 216 2.0 57
Show 21202+3818 PTT 18 124 6.6 58
Show 21239+3837 GRV 461 197 65.7 58
Show 21215+3648 TDT2919 344 1.5 62
Show 21258+3640 S 790 AB 28 34.5 63
Show 21258+3640 S 790 AC 99 53.1 63
Show 21258+3640 FYM 124 CD 84 19.4 63
Show 21295+3728 SEI1519 181 13.8 64
Show 21199+3815 ES 2062 327 4.0 64
Show 21194+3814 HO 286 AB 237 0.2 68
Show 21194+3814 CIA 5 Aa,Ab 230 0.0 68
Show 21194+3814 KRV 42 AC 256 65.7 68
Show 21245+3632 ES 2125 AB 34 2.0 69
Show 21245+3632 SEI1512 AC 198 29.0 69
Show 21226+3846 HDS3044 141 0.1 69
Show 21278+3835 KU 61 AB 271 3.9 70
Show 21278+3835 KU 61 AC 206 14.3 70
Show 21278+3835 KU 61 AD 235 25.7 70
Show 21247+3631 ES 2126 AB 170 4.1 70
Show 21247+3631 WSI 23 AC 84 9.0 70

 
 
WDS 21243+3740 : COMPONENTS
 
 
  A
B pa=36.9°
sep=0.11"
 
 
21243+3740 A
 
 
Componente originario normalizzato AB Name HD 203940 Coord arcsec 2000 212416.13+373944.2 Mag 7.81
Spectral class G5 (yellow) PmRA 145.00 PmDE 8.0 SAO 71288
HIP 105676 Tycho2 3182-04068-1 HD 203940 BD BD+37 4295
Tycho2
Tycho2 3182-04068-1 Pflag RAmdeg 321.06768996 DEmdeg 37.66229838
PmRA 157.2 PmDE 2.2 E RAmdeg 5 E DEmdeg 5
E pmRA 1.0 E pmDE 1.0 EpRAm 1991.25 EpDEm 1991.24
Num 12 Q RAmdeg 1.2 Q DEmdeg 1.2 Q pmRA 1.1
Q pmDE 1.2 BTmag 8.624 E BTmag 0.016 VTmag 7.875
E VTmag 0.011 Prox 866 TYC T HIP 105676
CCDM RAdeg 321.06722750 DEdeg 37.66229361 EpRA 1990 1.62
EpDE 1990 1.67 E RAdeg 4.8 E DEdeg 4.6 Posflg
Corr 0.1
SAO
SAO 71288 DelFlag RA1950 PmRA1950 0.0125
DE1950 PmDE1950 0.001 Vmag 8.4 SpType G5
Double code Source 5 CatNum 2111 DM BD+37 4295
DMcomp BDsup HD 203940 M HD 0
GC RA1950rad 5.59481543 DE1950rad 0.65356626 PmRA2000 0.0128
PmDE2000 -0.001
Hipparcos
Catalog H HIP 105676 Proxy RAhms 21 24 16.13
DEdms +37 39 44.2 Vmag 7.8 VarFlag R Vmag H
RAdeg 321.067 DEdeg 37.6623 AstroRef Plx 19.68
CCDM N CCDM Nsys Ncomp 1
MultFlag G Source Qual M HIP
Theta Rho HD 203940 BD BD+37 4295
CD CP Dm number +37 4295 VIred 0.71
SpType G5 R SpType Coord arcsec 2000 212416.13+373944.2
Hipparcos 2
HIP 105676 Sn 7 So 1 Nc 1
RArad 5.6036799572 DErad 0.6573309572 Plx 20.62 PmRA 145.81
PmDE 7.53 E RArad 0.41 E DErad 0.5 E Plx 0.75
E pmRA 0.49 E pmDE 0.6 Hpmag 7.9416 E Hpmag 0.0011
SHp 0.014 VA 0 BV 0.675 E BV 0.008
VI 0.73
 
 
21243+3740 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 212416.14+373944.3 Calc delta mag 7.81 Calc coord yes