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Current system
20120+3454
SEI 987


Nearby doubles
5' : 20123+3451
AG 249AB

6' : 20117+3458
SEI 977

6' : 20124+3455
ABT9004

9' : 20127+3456
TDT2090

14' : 20130+3450
SEI1012

16' : 20119+3510
SEI 988

18' : 20106+3452
A 281AB

18' : 20133+3502
ARY 23AB

18' : 20128+3439
TDT2091

19' : 20120+3436
HO 120AB

24' : 20117+3431
CRB 133

26' : 20129+3432
TDT2093

26' : 20120+3429
A 282AB

27' : 20103+3511
SEI 941

28' : 20139+3439
SEI1027

28' : 20129+3429
AG 250

30' : 20144+3501
COU2216

31' : 20099+3509
BKO 99

31' : 20096+3459
SEI 929

33' : 20097+3510
SEI 937

33' : 20096+3506
TOB 173

34' : 20113+3527
SEI 966

35' : 20116+3420
TDT2069

37' : 20135+3526
COU2214AB

38' : 20150+3500
ES 205

38' : 20089+3450
SEI 918



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

20120+3454 SEI 987

 
 
20h 12m 01.45s +34° 54' 05.1" P.A. 336.00 sep 23.2 mag 11.40,12.26 Sp A2
 
 
Coord 2000 20120+3454 Discov num SEI 987 Comp Coord arcsec 2000 20 12 01.45 +34 54 05.1
Date first 1896 Date last 2015 Obs 12
Pa first 336 Pa last 336.1 P.A. Now (θ) 336.1°
Sep first 23.7 Sep last 23.235 Sep. Now (ρ) 23.235"
Mag pri 11.40 Mag sec 12.26 delta mag (ΔM) 0.86 Spectral class A2 (white)
Pri motion ra +000 Sec motion ra +001
Pri motion dec -002 Sec motion dec -002
Notes
rPM=0.447
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Cygnus Tycho2 2679-02013-1 Gaia DR2 2055751912613118208
 
 
WDS 20120+3454 SEI 987 : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Sei1908 Pa - Scheiner, J. 1908POPot..59.....S
Sei1908 +Po Pub. Obs. Potsdam 20, #59, 1908
Sei1913A Pa - Scheiner, J. 1913QB811.B8.......
Sei1913A cited by Burnham (Carnegie Inst. Wash. #168, 1913)
Sei1932A Pa - Scheiner, J. 1932QB821.A43......
Sei1932A cited in ADS (Aitken Double Star Cat.), 1932
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20120+3454 SEI 987 1998 4 336 23.3 11.40 12.40 D 201201.45+345405.1
20120+3454 SEI 987 2002 5 336 23.3 11.40 12.40 D 201201.45+345405.1
20120+3454 SEI 987 2011 6 336 23.2 11.40 12.40 D 201201.45+345405.1
20120+3454 SEI 987 2015 8 336 23.2 11.40 12.26 A2 201201.45+345405.1

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

 
 
WDS 20120+3454 SEI 987 : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20120+3454 SEI 987 : MEASURES
 
 
No records found.

 
 
WDS 20120+3454 : VIRTUAL EYEPIECE
 
 

20120+3454 SEI 987A mag 11.4 Sp A2 20120+3454 SEI 987B sep 22.6 P.A. 340.00 mag 12.26 virtual eyepiece
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Radius:
Components only
 
 
WDS 20120+3454 : ALADIN DSS IMAGE @ 20h 12m 01.45s +34° 54' 05.1"
 
 
 
 
WDS 20120+3454 SEI 987 : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20120+3454 SEI 987 distance=0' 20123+3451 AG 249CD distance=5' 20123+3451 AG 249AB distance=5' 20123+3451 AG 249AC distance=5' 20117+3458 SEI 977 distance=6' 20124+3455 ABT9004 distance=6' 20127+3456 TDT2090 distance=9' 20130+3450 SEI1012 distance=14' 20119+3510 SEI 988 distance=16' 20106+3452 A 281AB distance=18' 20106+3452 ARN 96AC distance=18' 20133+3502 ARY 23AB distance=18' 20128+3439 TDT2091 distance=18' 20120+3436 HO 120AB distance=19' 20120+3436 HO 120AC distance=19' 20133+3502 SKF2392BD distance=19' 20133+3502 ARY 23BC distance=19' 20117+3431 CRB 133 distance=24' 20129+3432 TDT2093 distance=26' 20120+3429 A 282AB distance=26' 20120+3429 HO 121AB,C distance=26' 20120+3429 HO 121AB,D distance=26' 20103+3511 SEI 941 distance=27' 20139+3439 SEI1027 distance=28' 20129+3429 AG 250 distance=28' 20144+3501 COU2216 distance=30' 20099+3509 BKO 99 distance=31' 20096+3459 SEI 929 distance=31' 20097+3510 SEI 937 distance=33' 20096+3506 TOB 173 distance=33' 20113+3527 SEI 966 distance=34' 20116+3420 TDT2069 distance=35' 20135+3526 COU2214AB distance=37' 20135+3526 COU2214AC distance=37' 20150+3500 ES 205 distance=38' 20089+3450 SEI 918 distance=38' 20107+3529 RAO 427 distance=38' 20095+3431 TOB 172 distance=39' 20096+3519 COU2128 distance=39' 20114+3532 TDT2064 distance=39' 20142+3522 ES 204 distance=39' 20130+3416 LDS1035 distance=39' 20144+3524 ES 244AB distance=43' 20086+3446 TDT2016 distance=43' 20144+3524 ES 244BC distance=43' 20144+3524 ES 244CD distance=43' 20090+3516 SEI 919 distance=43' 20146+3522 SEI1040 distance=43' 20092+3520 ALI 184 distance=43' 20095+3525 TDT2034 distance=44' 20131+3411 STTA203 distance=45' 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 20120+3454 SEI 987 336 23.2
Show 20123+3451 AG 249 CD 352 6.3 5
Show 20123+3451 AG 249 AB 133 32.9 5
Show 20123+3451 AG 249 AC 30 13.0 5
Show 20117+3458 SEI 977 39 15.2 6
Show 20124+3455 ABT9004 5 27.9 6
Show 20127+3456 TDT2090 256 0.5 9
Show 20130+3450 SEI1012 49 14.6 14
Show 20119+3510 SEI 988 3 3.8 16
Show 20106+3452 A 281 AB 172 4.2 18
Show 20106+3452 ARN 96 AC 314 63.6 18
Show 20133+3502 ARY 23 AB 28 81.6 18
Show 20128+3439 TDT2091 24 1.0 18
Show 20120+3436 HO 120 AB 111 1.2 19
Show 20120+3436 HO 120 AC 200 24.2 19
Show 20133+3502 SKF2392 BD 346 14.0 19
Show 20133+3502 ARY 23 BC 339 65.0 19
Show 20117+3431 CRB 133 113 10.7 24
Show 20129+3432 TDT2093 20 0.4 26
Show 20120+3429 A 282 AB 207 0.3 26
Show 20120+3429 HO 121 AB,C 12 24.5 26
Show 20120+3429 HO 121 AB,D 11 42.0 26
Show 20103+3511 SEI 941 156 27.5 27
Show 20139+3439 SEI1027 10 28.7 28
Show 20129+3429 AG 250 53 8.9 28
Show 20144+3501 COU2216 207 0.6 30
Show 20099+3509 BKO 99 67 7.3 31
Show 20096+3459 SEI 929 31 20.9 31
Show 20097+3510 SEI 937 67 25.3 33
Show 20096+3506 TOB 173 186 15.6 33
Show 20113+3527 SEI 966 246 26.0 34
Show 20116+3420 TDT2069 317 0.5 35
Show 20135+3526 COU2214 AB 31 1.1 37
Show 20135+3526 COU2214 AC 263 3.4 37
Show 20150+3500 ES 205 198 7.1 38
Show 20089+3450 SEI 918 343 14.6 38
Show 20107+3529 RAO 427 126 0.5 38
Show 20095+3431 TOB 172 108 8.5 39
Show 20096+3519 COU2128 243 2.1 39
Show 20114+3532 TDT2064 329 0.6 39
Show 20142+3522 ES 204 281 15.1 39
Show 20130+3416 LDS1035 193 17.3 39
Show 20144+3524 ES 244 AB 130 41.2 43
Show 20086+3446 TDT2016 166 0.5 43
Show 20144+3524 ES 244 BC 17 4.9 43
Show 20144+3524 ES 244 CD 304 4.1 43
Show 20090+3516 SEI 919 118 5.5 43
Show 20146+3522 SEI1040 49 4.4 43
Show 20092+3520 ALI 184 228 13.2 43
Show 20095+3525 TDT2034 120 0.3 44
Show 20131+3411 STTA203 37 88.4 45

 
 
WDS 20120+3454 : COMPONENTS
 
 
  A
B pa=340.0°
sep=22.60"
 
 
20120+3454 A
 
 
Componente originario normalizzato AB Coord arcsec 2000 201201.45+345405.1 Mag 11.4 Spectral class A2 (white)
PmRA 0.00 PmDE -2.0 Tycho2 2679-02013-1
Tycho2
Tycho2 2679-02013-1 Pflag RAmdeg 303.00608692 DEmdeg 34.90143079
PmRA 6.3 PmDE 3.2 E RAmdeg 52 E DEmdeg 51
E pmRA 2.4 E pmDE 2.4 EpRAm 1985.17 EpDEm 1985.89
Num 4 Q RAmdeg 0.5 Q DEmdeg 0.1 Q pmRA 0.5
Q pmDE 0.1 BTmag 11.691 E BTmag 0.075 VTmag 11.397
E VTmag 0.097 Prox 999 TYC T HIP
CCDM RAdeg 303.00606778 DEdeg 34.90142361 EpRA 1990 1.61
EpDE 1990 1.70 E RAdeg 54.4 E DEdeg 53.4 Posflg
Corr 0.0
CCDM
Ccdm 20120+3454 RComp Comp A Note1
Note2 Discov num DRAs 1.47 DDEs 5.1
R dRAs 65 Year Theta Rho
Obs 2 Vmag 10.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 20082N3436A
HIC
 
 
20120+3454 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 201200.82+345426.3 Mag 12.26 PmRA 1.00
PmDE -2.0 Calc delta mag 0.86 Calc coord yes
CCDM
Ccdm 20120+3454 RComp Comp B Note1
Note2 Discov num SEI 987 DRAs 0.71 DDEs 26.2
R dRAs 65 Year 1896 Theta 336 Rho 23.6
Obs 1 Vmag 11.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 20082N3436B
HIC