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Doubles in session


Current system
20374+7536
HEI 7
VW Cep


Nearby doubles
41' : 20272+7522
TDT2285

44' : 20354+7619
OSW 17

45' : 20485+7517
LDS1940

63' : 20304+7634
TDT2327

63' : 20500+7455
VKI 38

66' : 20550+7547
LDS1942

70' : 20201+7605
A 869

78' : 20562+7611
UC 4336

80' : 20248+7641
TDT2248

80' : 20485+7429
MLR 238

95' : 20512+7656
SLW1227

98' : 20557+7648
UC 4331

99' : 20546+7653
LOC 460

125' : 20219+7347
HDS2909

128' : 20217+7345
A 870

128' : 20282+7333
MLR 233

130' : 20464+7332
TDS1099

138' : 20408+7319
LDS1939

138' : 20323+7753
LOC 450

161' : 20186+7314
LDS1931

163' : 20515+7304
LDS1941

166' : 20291+7819
KPP1433

167' : 20491+7818
LOC 463

176' : 20277+7828
KPP4200

177' : 20274+7245
A 871

188' : 20339+7229
LDS1933



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.

20374+7536 HEI 7 (VW Cep)

 
 
20h 37m 21.54s +75° 36' 01.5" P.A. 231.00 sep 0.7 mag 7.68,10.48 Sp K0V dist. 27.59 pc (90 l.y.)
 
 
Coord 2000 20374+7536 Discov num HEI   7 Comp Coord arcsec 2000 20 37 21.54 +75 36 01.5
Date first 1974 Date last 2007 Obs 18
Pa first 223 Pa last 231 P.A. Now (θ) 231°
Sep first 0.6 Sep last 0.675 Sep. Now (ρ) 0.675"
Mag pri 7.68 Mag sec 10.48 delta mag (ΔM) 2.8 Spectral class K0V (yellow-orange)
Pri motion ra +309 Sec motion ra
Pri motion dec +540 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name VW Cep Constellation Cepheus SAO 9828 HIP 101750
Tycho2 4585-03284-1 Gaia DR2 2278045980881186176 HD 197433 GC 28804
GL GJ 1255A BD BD+75 752 Distance 27.59 Distance ly 90
 
 
ORBITAL ELEMENTS
 
 
Period (P)30.64y Periastron (T)1996.75y Semi-major axis (a)0.469a
Eccentricity (e)0.629 Inclination (i)34.4° Longitude of periastron (ω)46.9°
Node (Ω)26.4° Notesn ReferenceDoc2013k
Equinox2000 Last observation2007 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 190.4 0.374
2001 200.3 0.447
2002 207.6 0.507
2003 213.4 0.557
2004 218.4 0.598
2005 222.8 0.631
2006 226.8 0.657
2007 230.5 0.677
2008 234.0 0.691
2009 237.5 0.699
2010 240.8 0.703
2011 244.2 0.702
2012 247.6 0.697
2013 251.0 0.687
2014 254.6 0.673
2015 258.4 0.655
2016 262.4 0.633
2017 266.7 0.607
2018 271.4 0.577
2019 276.7 0.544
2020 282.7 0.508
2021 289.6 0.468
2022 298.0 0.425
2023 308.3 0.379
2024 321.4 0.332
2025 339.1 0.283
2026 4.2 0.232
2027 44.5 0.177
2028 110.4 0.157
2029 159.1 0.229
2030 181.6 0.321


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


 
  


wds20374%2B7536a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 20374+7536 HEI 7 (VW Cep) : NOTES
 
 
discov_num notes refcode
HEI 7 The primary is the class W eclipsing SB VW Cep, P = 0.278 d. The
light amplitude is 0.5 mag. and the light curve is variable.
The Hershey (1975) orbit is astrometric; only the value of the Hry1975
semi-major axis was computed after the companion was resolved. The
ascending node is tentatively identified from what appears to be a
lighttime effect superimposed on intrinsic period changes in the
eclipsing pair.
See Baize & Petit (1989) catalog of doubles with variable component. Baz1989d
BD+74@889, (mag. 7.9, G5) one degree distant, shares common proper
motion and radial velocity.
Pribulla & Rucinski (2006) estimate the mass of the contact pair at Pbl2006
1.781 Msun and the minimum mass of the wider component at 0.42 Msun.
 
 
REFERENCES
 
 
refcode metd author reference
Baz1989d - Baize, P. & Petit, M. 1989A&AS...77..497B
Baz1989d A&AS 77, 497, 1989
Doc2013k orb - Docobo, J.A. & Andrade, M. 2013IAUDS.181T...1D
Doc2013k Inf. Circ. 181, 1, 2013
Hry1975 orb - Hershey, J.L. 1975AJ.....80..662H
Hry1975 AJ 80, 662, 1975
Pbl2006 A j Pribulla, T. & Rucinski, S.M. 2006AJ....131.2986P
Pbl2006 AJ 131, 2986, 2006
 
 
DISCOVERER
 
 
idgroup discov author
1 HEI Heintz, W.D.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20374+7536 HEI 7 1999 15 187 0.4 7.68 10.48 K0V NOD 203720.82+753556.7
20374+7536 HEI 7 2007 17 232 0.7 7.68 10.48 K0V NOD 203720.82+753556.7

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

 
 
WDS 20374+7536 HEI 7 (VW Cep) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20374+7536 HEI 7 (VW Cep) : MEASURES
 
 
No records found.

 
 
WDS 20374+7536 (VW Cep) : VIRTUAL EYEPIECE
 
 

20374+7536 HEI 7A mag 7.68 Sp K0V 20374+7536 HEI 7B sep 0.4 P.A. 197.10 mag 10.48 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 20374+7536 (VW Cep) : ALADIN DSS IMAGE @ 20h 37m 21.54s +75° 36' 01.5"
 
 
 
 
WDS 20374+7536 HEI 7 (VW Cep) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20374+7536 HEI 7 distance=0' 20272+7522 TDT2285 distance=41' 20354+7619 OSW 17 distance=44' 20485+7517 LDS1940 distance=45' 20304+7634 TDT2327 distance=63' 20500+7455 VKI 38 distance=63' 20550+7547 LDS1942 distance=66' 20201+7605 A 869 distance=70' 20562+7611 UC 4336 distance=78' 20248+7641 TDT2248 distance=80' 20485+7429 MLR 238 distance=80' 20512+7656 SLW1227 distance=95' 20557+7648 UC 4331 distance=98' 20546+7653 LOC 460 distance=99' 20219+7347 HDS2909 distance=125' 20217+7345 A 870 distance=128' 20282+7333 MLR 233 distance=128' 20464+7332 TDS1099 distance=130' 20408+7319 LDS1939 distance=138' 20323+7753 LOC 450 distance=138' 20186+7314 LDS1931 distance=161' 20515+7304 LDS1941 distance=163' 20291+7819 KPP1433 distance=166' 20491+7818 LOC 463 distance=167' 20277+7828 KPP4200 distance=176' 20274+7245 A 871 distance=177' 20339+7229 LDS1933 distance=188' 20195+7836 WFC 232 distance=190' 20458+7219 MLB 421 distance=201' 20499+7900 LOC 464 distance=209' 20460+7907 MLR 237AB distance=214' 20423+7915 SKF1247 distance=220' 20458+7146 SKF1249 distance=233' 20530+7932 TDT2601 distance=241' 20493+7131 MLB 422 distance=250' 20571+7138 TDT2652 distance=253' 20380+7119 MLB 420 distance=257' 20192+7124 MLB 419 distance=264' 20372+8001 LDS1936 distance=266' 20496+8000 TDT2564 distance=267' 20554+8011 LDS1943 distance=282' 20477+8016 SKF1250 distance=282' 20397+8030 HDS2946 distance=295' 20561+7052 TDT2640 distance=296' 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 20374+7536 HEI 7 231 0.7
Show 20272+7522 TDT2285 154 0.6 41
Show 20354+7619 OSW 17 198 65.6 44
Show 20485+7517 LDS1940 133 10.0 45
Show 20304+7634 TDT2327 320 0.6 63
Show 20500+7455 VKI 38 297 2.8 63
Show 20550+7547 LDS1942 346 2.7 66
Show 20201+7605 A 869 269 2.1 70
Show 20562+7611 UC 4336 300 22.3 78
Show 20248+7641 TDT2248 243 0.4 80
Show 20485+7429 MLR 238 20 0.2 80
Show 20512+7656 SLW1227 136 10.1 95
Show 20557+7648 UC 4331 35 15.6 98
Show 20546+7653 LOC 460 81 6.6 99
Show 20219+7347 HDS2909 238 0.7 125
Show 20217+7345 A 870 196 0.1 128
Show 20282+7333 MLR 233 88 1.2 128
Show 20464+7332 TDS1099 336 1.2 130
Show 20408+7319 LDS1939 227 18.9 138
Show 20323+7753 LOC 450 293 3.2 138
Show 20186+7314 LDS1931 85 21.4 161
Show 20515+7304 LDS1941 234 1.6 163
Show 20291+7819 KPP1433 234 10.8 166
Show 20491+7818 LOC 463 193 1.2 167
Show 20277+7828 KPP4200 166 1.7 176
Show 20274+7245 A 871 184 0.3 177
Show 20339+7229 LDS1933 175 7.0 188
Show 20195+7836 WFC 232 143 3.8 190
Show 20458+7219 MLB 421 251 1.9 201
Show 20499+7900 LOC 464 336 2.1 209
Show 20460+7907 MLR 237 AB 118 3.1 214
Show 20423+7915 SKF1247 338 17.3 220
Show 20458+7146 SKF1249 281 39.0 233
Show 20530+7932 TDT2601 350 2.5 241
Show 20493+7131 MLB 422 203 5.5 250
Show 20571+7138 TDT2652 307 0.6 253
Show 20380+7119 MLB 420 276 3.6 257
Show 20192+7124 MLB 419 314 2.0 264
Show 20372+8001 LDS1936 313 40.8 266
Show 20496+8000 TDT2564 256 1.1 267
Show 20554+8011 LDS1943 314 15.8 282
Show 20477+8016 SKF1250 333 4.3 282
Show 20397+8030 HDS2946 143 0.2 295
Show 20561+7052 TDT2640 318 0.7 296

 
 
WDS 20374+7536 : COMPONENTS
 
 
  A
B pa=197.1°
sep=0.44"
 
 
20374+7536 A
 
 
Componente originario normalizzato AB Name VW Cep Coord arcsec 2000 203721.54+753601.5 Mag 7.68
Spectral class K0V (yellow-orange) PmRA 309.00 PmDE 540.0 SAO 9828
HIP 101750 Tycho2 4585-03284-1 HD 197433 GC 28804
BD BD+75 752
Tycho2
Tycho2 4585-03284-1 Pflag RAmdeg 309.33995894 DEmdeg 75.60042803
PmRA 331.6 PmDE 548.3 E RAmdeg 5 E DEmdeg 5
E pmRA 1.3 E pmDE 1.3 EpRAm 1991.41 EpDEm 1991.43
Num 9 Q RAmdeg 1.6 Q DEmdeg 1.6 Q pmRA 1.6
Q pmDE 1.5 BTmag 8.566 E BTmag 0.017 VTmag 7.600
E VTmag 0.010 Prox 999 TYC T HIP 101750
CCDM AB RAdeg 309.33687611 DEdeg 75.59916361 EpRA 1990 1.68
EpDE 1990 1.70 E RAdeg 4.6 E DEdeg 4.8 Posflg
Corr -0.1
SAO
SAO 9828 DelFlag RA1950 PmRA1950 0.0899
DE1950 PmDE1950 0.56 Vmag 7.1 SpType G5
Double code Source 70 CatNum 28804 DM BD+75 752
DMcomp BDsup HD 197433 M HD 0
GC 28804 RA1950rad 5.40201287 DE1950rad 1.31626126 PmRA2000 0.0895
PmDE2000 0.561
Hipparcos
Catalog H HIP 101750 Proxy H RAhms 20 37 20.82
DEdms +75 35 56.7 Vmag 7.46 VarFlag 2 R Vmag H
RAdeg 309.337 DEdeg 75.5991 AstroRef A Plx 36.16
CCDM 20374+7536 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual C M HIP AB
Theta 291 Rho 0.501 HD 197433 BD BD+75 752
CD CP Dm number +75 752 VIred 0.86
SpType K0Vvar R SpType Coord arcsec 2000 203720.82+753556.7
Hipparcos 2
HIP 101750 Sn 15 So 3 Nc 2
RArad 5.3989447685 DErad 1.3194530818 Plx 36.25 PmRA 308.71
PmDE 540.86 E RArad 0.55 E DErad 0.49 E Plx 0.58
E pmRA 0.67 E pmDE 0.58 Hpmag 7.5982 E Hpmag 0.0185
SHp 0.129 VA 1 BV 0.859 E BV 0.009
VI 0.87
CCDM
Ccdm 20374+7536 RComp Comp A Note1
Note2 Discov num DRAs -2.41 DDEs 2.1
R dRAs 10 Year Theta Rho
Obs 2 Vmag 7.6 Sp G5 PmNote *
PmRA 338 PmDE 557 Dm number +75 752 Cat1 BD
Name2 +75 860 Cat2 AGK2/3 HD 197433 M HD
ADS BDS M ADS BDS N IDS IDS 20388N7514A
HIC 101750
 
 
20374+7536 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 203721.51+753601.1 Mag 10.48 Calc delta mag 2.8
Calc coord yes
CCDM
Ccdm 20374+7536 RComp Comp B Note1 *
Note2 Discov num HEI DRAs DDEs
R dRAs Year 1974 Theta 223 Rho 0.6
Obs 1 Vmag 10.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 20388N7514B
HIC 101750