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Current system
21238+3721
STFA 55 AF


Nearby doubles
17' : 21249+3711
TDS1126

20' : 21243+3740
WSI 7

21' : 21241+3741
SEI1458

21' : 21252+3708
SEI1513

24' : 21221+3734
ES 2517

27' : 21226+3744
COU1820

28' : 21215+3719
ROE 24AB

33' : 21264+3712
SEI1514

35' : 21228+3754
WIS 349

36' : 21231+3647
ES 2124

37' : 21268+3731
SEI1516AB

40' : 21233+3801
ES 2519

44' : 21215+3648
TDT2919

48' : 21278+3715
SEI1518

48' : 21258+3640
S 790AB

49' : 21233+3810
ALI 690

51' : 21245+3632
ES 2125AB

52' : 21272+3752
ES 2520

52' : 21247+3631
ES 2126AB

55' : 21235+3627
TDT2940

55' : 21252+3629
CBL 93

56' : 21250+3814
TDT2950

56' : 21196+3656
TDT2905

57' : 21195+3745
TDT2904

60' : 21231+3821
ALI 689

60' : 21284+3745
TDT2983



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

21238+3721 STFA 55 AF

 
 
21h 23m 48.39s +37° 21' 05.4" P.A. 201.00 sep 22.8 mag 6.61,14.80 Sp K5 dist. 281.69 pc (918.87 l.y.)
 
 
Coord 2000 21238+3721 Discov num STFA 55 Comp AF Coord arcsec 2000 21 23 48.39 +37 21 05.4
Date first 2002 Date last 2015 Obs 5
Pa first 202 Pa last 201.4 P.A. Now (θ) 201.4°
Sep first 22.2 Sep last 22.849 Sep. Now (ρ) 22.849"
Mag pri 6.61 Mag sec 14.80 delta mag (ΔM) 8.19 Spectral class K5 (yellow-orange)
Pri motion ra -006 Sec motion ra
Pri motion dec -007 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
21238+3721 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 203857 71280 21 23 48 +37 21 05 STFA 55 AB 2012 30 304 364.1 6.61 6.61 0.00
Show 71280 21 23 48 +37 21 05 STFA 55 AC 2015 8 154 178.3 6.61 11.08 4.47
Show 71280 21 23 48 +37 21 05 STFA 55 AF 2015 5 201 22.8 6.61 14.80 8.19 <===
Show 21 23 55 +37 18 25 STFA 55 CD 2015 7 183 12.8 11.08 14.80 3.72
Show 21 23 55 +37 18 25 STFA 55 CE 2015 7 320 17.7 11.08 13.70 2.62
Sextuple system
6 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Cygnus SAO 71280 HIP 105637 Tycho2 2715-03976-1
Gaia DR2 1963812021591567872 HD 203857 HR 8193 BD BD+36 4543
Distance 281.69 Distance ly 918.87
 
 
WDS 21238+3721 STFA 55 AF : NOTES
 
 
discov_num notes refcode
STFA 55 B is BD+36@4537.
Toyota et al. (2009) monitored the RV of the A component every 1-2
months between 2003 Mar - 2007 Nov, using a high-dispersion echelle
(precision ~10 m/s). The star shows a large RV variation; a Keplerian
fit gives a period of 863.8d and an eccentricity of 0.20, which may be
induced by a companion of mass ~8.1 Mjup, by stellar rotation or by
non-radial pulsation. Toy2009
 
 
REFERENCES
 
 
refcode metd author reference
Toy2009 rv - Toyota, E., Itoh, Y., Ishiguma, S., Urakawa, S., Murata, D., Oasa, Y., 2008PASJ...61...19T
Toy2009 Matsuyama, H., Funayama, H., Sato, B., & Mukai, T.
Toy2009 PASJ 61, 19, 2009
 
 
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
21238+3721 STFA 55 AF 2012 4 202 23.4 6.61 14.80 N 212348.39+372105.4
21238+3721 STFA 55 AF 2015 5 201 22.8 6.61 14.80 K5 N 212348.39+372105.4

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

 
 
WDS 21238+3721 STFA 55 AF : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21238+3721 STFA 55 AF : MEASURES
 
 
No records found.

 
 
WDS 21238+3721 : VIRTUAL EYEPIECE
 
 

21238+3721 STFA 55A mag 6.61 Sp K5 21238+3721 STFA 55B sep 314.6 P.A. 310.30 mag 6.61 21238+3721 STFA 55C sep 178.3 P.A. 154.40 mag 11.08 21238+3721 STFA 55D sep 189.7 P.A. 156.30 mag 14.8 21238+3721 STFA 55E sep 162.1 P.A. 155.20 mag 13.7 21238+3721 STFA 55F sep 22.3 P.A. 197.30 mag 14.8 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 21238+3721 : ALADIN DSS IMAGE @ 21h 23m 48.39s +37° 21' 05.4"
 
 
 
 
WDS 21238+3721 STFA 55 AF : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21238+3721 STFA 55AF distance=0' 21238+3721 STFA 55CD distance=3' 21238+3721 STFA 55CE distance=3' 21249+3711 TDS1126 distance=17' 21243+3740 WSI 7 distance=20' 21241+3741 SEI1458 distance=21' 21252+3708 SEI1513 distance=21' 21221+3734 ES 2517 distance=24' 21226+3744 COU1820 distance=27' 21215+3719 ROE 24AB distance=28' 21215+3719 ROE 24AD distance=28' 21215+3719 ROE 24AC distance=28' 21215+3719 ROE 23CD distance=29' 21264+3712 SEI1514 distance=33' 21228+3754 WIS 349 distance=35' 21231+3647 ES 2124 distance=36' 21268+3731 COU1821Da,Db distance=37' 21268+3731 SEI1516AB distance=37' 21268+3731 HEI9004AC distance=37' 21268+3731 HEI9004AD distance=37' 21233+3801 ES 2519 distance=40' 21215+3648 TDT2919 distance=44' 21278+3715 SEI1518 distance=48' 21258+3640 S 790AB distance=48' 21258+3640 S 790AC distance=48' 21258+3640 FYM 124CD distance=48' 21233+3810 ALI 690 distance=49' 21245+3632 ES 2125AB distance=51' 21245+3632 SEI1512AC distance=51' 21272+3752 ES 2520 distance=52' 21247+3631 ES 2126AB distance=52' 21247+3631 WSI 23AC distance=52' 21235+3627 TDT2940 distance=55' 21252+3629 CBL 93 distance=55' 21250+3814 TDT2950 distance=56' 21196+3656 TDT2905 distance=56' 21195+3745 TDT2904 distance=57' 21231+3821 ALI 689 distance=60' 21284+3745 TDT2983 distance=60' 21257+3824 TDT2955 distance=68' 21287+3755 KPP1064 distance=68' 21271+3627 SEI1517 distance=68' 21283+3640 CRB 142 distance=68' 21295+3728 SEI1519 distance=69' 21184+3749 SEI1495 distance=70' 21202+3818 PTT 18 distance=70' 21285+3636 ALI 443 distance=73' 21199+3815 ES 2062 distance=73' 21244+3607 TDS1125 distance=75' 21194+3814 HO 286AB distance=75' 21194+3814 CIA 5Aa,Ab distance=75' 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 21238+3721 STFA 55 AB 304 364.1
Show 21238+3721 STFA 55 AC 154 178.3
Show 21238+3721 STFA 55 AF 201 22.8
Show 21238+3721 STFA 55 CD 183 12.8 3
Show 21238+3721 STFA 55 CE 320 17.7 3
Show 21249+3711 TDS1126 314 1.9 17
Show 21243+3740 WSI 7 44 0.1 20
Show 21241+3741 SEI1458 312 7.9 21
Show 21252+3708 SEI1513 90 14.5 21
Show 21221+3734 ES 2517 115 5.3 24
Show 21226+3744 COU1820 319 1.4 27
Show 21215+3719 ROE 24 AB 168 10.3 28
Show 21215+3719 ROE 24 AD 266 81.7 28
Show 21215+3719 ROE 24 AC 266 68.7 28
Show 21215+3719 ROE 23 CD 261 13.1 29
Show 21264+3712 SEI1514 184 12.0 33
Show 21228+3754 WIS 349 176 44.9 35
Show 21231+3647 ES 2124 263 7.6 36
Show 21268+3731 COU1821 Da,Db 96 0.7 37
Show 21268+3731 SEI1516 AB 335 3.9 37
Show 21268+3731 HEI9004 AC 275 25.5 37
Show 21268+3731 HEI9004 AD 335 109.8 37
Show 21233+3801 ES 2519 224 6.5 40
Show 21215+3648 TDT2919 344 1.5 44
Show 21278+3715 SEI1518 143 15.5 48
Show 21258+3640 S 790 AB 28 34.5 48
Show 21258+3640 S 790 AC 99 53.1 48
Show 21258+3640 FYM 124 CD 84 19.4 48
Show 21233+3810 ALI 690 65 8.8 49
Show 21245+3632 ES 2125 AB 34 2.0 51
Show 21245+3632 SEI1512 AC 198 29.0 51
Show 21272+3752 ES 2520 238 6.2 52
Show 21247+3631 ES 2126 AB 170 4.1 52
Show 21247+3631 WSI 23 AC 84 9.0 52
Show 21235+3627 TDT2940 339 1.1 55
Show 21252+3629 CBL 93 56 12.9 55
Show 21250+3814 TDT2950 200 1.6 56
Show 21196+3656 TDT2905 184 2.4 56
Show 21195+3745 TDT2904 216 2.0 57
Show 21231+3821 ALI 689 107 14.6 60
Show 21284+3745 TDT2983 111 0.5 60
Show 21257+3824 TDT2955 18 0.5 68
Show 21287+3755 KPP1064 246 8.5 68
Show 21271+3627 SEI1517 80 16.3 68
Show 21283+3640 CRB 142 46 25.7 68
Show 21295+3728 SEI1519 181 13.8 69
Show 21184+3749 SEI1495 273 14.8 70
Show 21202+3818 PTT 18 124 6.6 70
Show 21285+3636 ALI 443 298 4.3 73
Show 21199+3815 ES 2062 327 4.0 73
Show 21244+3607 TDS1125 12 1.4 75

 
 
WDS 21238+3721 : COMPONENTS
 
 
  A B C D E
B pa=310.3°
sep=314.62"
 
C pa=154.4°
sep=178.26"
pa=139.0°
sep=482.88"
 
D pa=156.3°
sep=189.66"
pa=140.0°
sep=492.25"
pa=182.5°
sep=12.82"
 
E pa=155.2°
sep=162.10"
pa=138.8°
sep=466.69"
pa=326.4°
sep=16.33"
pa=342.2°
sep=27.73"
 
F pa=197.3°
sep=22.28"
pa=134.0°
sep=323.99"
pa=329.1°
sep=162.64"
pa=331.4°
sep=173.47"
pa=329.4°
sep=146.33"
 
 
21238+3721 A
 
 
Name HD 203857 Coord arcsec 2000 212348.39+372105.4 Mag 6.61 Spectral class K5 (yellow-orange)
PmRA -6.00 PmDE -7.0 SAO 71280 HIP 105637
Tycho2 2715-03976-1 HD 203857 HR 8193 GC 29966
BD BD+36 4543
Tycho2
Tycho2 2715-03976-1 Pflag RAmdeg 320.95161809 DEmdeg 37.35147842
PmRA -5.2 PmDE -7.8 E RAmdeg 4 E DEmdeg 4
E pmRA 1.0 E pmDE 1.0 EpRAm 1991.46 EpDEm 1991.49
Num 14 Q RAmdeg 1.0 Q DEmdeg 1.0 Q pmRA 1.0
Q pmDE 0.9 BTmag 8.378 E BTmag 0.015 VTmag 6.607
E VTmag 0.009 Prox 999 TYC T HIP 105637
CCDM RAdeg 320.95163333 DEdeg 37.35149639 EpRA 1990 1.69
EpDE 1990 1.71 E RAdeg 3.8 E DEdeg 3.6 Posflg
Corr 0.1
SAO
SAO 71280 DelFlag RA1950 PmRA1950 -0.001
DE1950 PmDE1950 -0.004 Vmag 6.6 SpType K5
Double code Source 70 CatNum 29966 DM BD+36 4543
DMcomp BDsup HD 203857 M HD 0
GC 29966 RA1950rad 5.59281891 DE1950rad 0.64814889 PmRA2000 -0.0008
PmDE2000 -0.007
Hipparcos
Catalog H HIP 105637 Proxy RAhms 21 23 48.39
DEdms +37 21 05.4 Vmag 6.46 VarFlag R Vmag H
RAdeg 320.952 DEdeg 37.3515 AstroRef Plx 3.54
CCDM 21237+3722 N CCDM I Nsys 2 Ncomp 1
MultFlag Source Qual M HIP
Theta Rho HD 203857 BD BD+36 4543
CD CP Dm number +36 4543 VIred 1.46
SpType K5 R SpType Coord arcsec 2000 212348.39+372105.4
Hipparcos 2
HIP 105637 Sn 5 So 0 Nc 1
RArad 5.601662794 DErad 0.6519066192 Plx 3.55 PmRA -5.96
PmDE -7.39 E RArad 0.26 E DErad 0.29 E Plx 0.45
E pmRA 0.27 E pmDE 0.34 Hpmag 6.587 E Hpmag 0.0006
SHp 0.01 VA 0 BV 1.472 E BV 0.006
VI 1.49
 
 
21238+3721 B
 
 
Coord arcsec 2000 212328.27+372429.0 Mag 6.61 PmRA 52.00 PmDE 25.0
Calc coord yes
 
 
21238+3721 C
 
 
Coord arcsec 2000 212354.84+371824.6 Coord calc 212354.84+371824.6 Mag 11.08 PmRA 1.00
PmDE 3.0 Calc delta mag 4.47
 
 
21238+3721 D
 
 
Coord arcsec 2000 212354.79+371811.8 Mag 14.8 Calc delta mag 8.19 Calc coord yes
 
 
21238+3721 E
 
 
Coord arcsec 2000 212354.08+371838.2 Mag 13.7 PmRA -6.00 PmDE -3.0
Calc delta mag 7.09 Calc coord yes
 
 
21238+3721 F
 
 
Coord arcsec 2000 212347.83+372044.1 Mag 14.8 Calc delta mag 8.19 Calc coord yes