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Current system
21539+2821
WSI 8
HD 208174


Nearby doubles
21' : 21524+2823
NSN 67

23' : 21556+2823
MLB 577AB

33' : 21540+2852
GRV 519

35' : 21553+2850
COU 836

37' : 21559+2753
HJ 1704

38' : 21538+2856
MLB 495

39' : 21561+2846
COU 837AB

41' : 21521+2748
HO 171

43' : 21517+2852
SHN 256

46' : 21517+2856
HLD 49

52' : 21505+2756
AZC 116

53' : 21565+2900
HJ 1706

55' : 21503+2754
MLB 576

60' : 21575+2856
LEP 104

60' : 21580+2755
KPP3375

61' : 21555+2724
A 303AB

62' : 21573+2738
NSN 749

63' : 21510+2911
A 889AB

70' : 21567+2721
GRV 521

75' : 21593+2800
MLB 578

78' : 21480+2819
MLB 541

79' : 21575+2923
UC 4612

79' : 21536+2701
ES 523

81' : 21530+2939
BRT 59

83' : 21585+2725
A 304AB

85' : 21561+2701
J 854



Selections
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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.

21539+2821 WSI 8 (HD 208174)

 
 
21h 53m 54.79s +28° 20' 32.0" P.A. 142.00 sep 0.1 mag 6.79, Sp A2 dist. 104.6 pc (341.21 l.y.)
 
 
Coord 2000 21539+2821 Discov num WSI   8 Comp Coord arcsec 2000 21 53 54.79 +28 20 32.0
Date first 1998 Date last 2011 Obs 3
Pa first 157 Pa last 142.2 P.A. Now (θ) 142.2°
Sep first 0.3 Sep last 0.111 Sep. Now (ρ) 0.111"
Mag pri 6.79 Mag sec delta mag (ΔM) Spectral class A2 (white)
Pri motion ra -160 Sec motion ra
Pri motion dec -114 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 208174 Constellation Pegasus SAO 90085 HIP 108084
Tycho2 2214-01318-1 Gaia DR2 1896311937602804992 HD 208174 GC 30661
BD BD+27 4191 Distance 104.6 Distance ly 341.21
 
 
ORBITAL ELEMENTS
 
 
Period (P)831.1756d (2.28y)± 64.2443 Periastron (T)48177.7734d (1990.782y)± 97.9153 Semi-major axis (a)5.25m± 0.76
Eccentricity (e)0 Inclination (i)35.63°± 17.36 Longitude of periastron (ω)0°
Node (Ω)67.41°± 38.98 Notesn ReferenceHIP1997d
Equinox Last observation1991 Grade9(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 82.4 0.005
2001-01-01 244.5 0.005
2002-01-01 46.3 0.005
2003-01-01 206.2 0.005
2004-01-01 2.7 0.004
2005-01-01 156.4 0.004
2006-01-01 310.3 0.004
2007-01-01 107.1 0.005
2008-01-01 267.1 0.005
2009-01-01 69.0 0.005
2010-01-01 231.1 0.005
2011-01-01 31.6 0.005
2012-01-01 189.0 0.004
2013-01-01 343.3 0.004
2014-01-01 136.7 0.004
2015-01-01 292.7 0.005
2016-01-01 92.0 0.005
2017-01-01 253.5 0.005
2018-01-01 55.7 0.005
2019-01-01 216.8 0.005
2020-01-01 15.1 0.005
2021-01-01 170.0 0.004
2022-01-01 323.4 0.004
2023-01-01 118.5 0.005
2024-01-01 277.0 0.005
2025-01-01 78.1 0.005
2026-01-01 240.3 0.005
2027-01-01 41.8 0.005
2028-01-01 200.9 0.005
2029-01-01 356.7 0.004
2030-01-01 150.1 0.004


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


 
  


wds21539%2B2821r.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 21539+2821 WSI 8 (HD 208174) : NOTES
 
 
discov_num notes refcode
GC 30661 Hipparcos astrometric solution assumes circular orbit (e = omega = 0). HIP1997d
 
 
REFERENCES
 
 
refcode metd author reference
HIP1997d orb - Hipparcos 1997yCat.1239....0E
HIP1997d Hipparcos Catalog, ESA SP-1200, 1997
HIP1997d (DMSA/O Orbital Solutions)
 
 
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
21539+2821 WSI 8 2004 3 15 0.3 6.79   A2 O 215354.79+282032.0
21539+2821 WSI 8 2007 4 259 0.1 6.79   A2 O 215354.79+282032.0
21539+2821 WSI 8 2011 3 142 0.1 6.79   A2 NO 215354.79+282032.0

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

 
 
WDS 21539+2821 WSI 8 (HD 208174) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21539+2821 WSI 8 (HD 208174) : MEASURES
 
 
No records found.

 
 
WDS 21539+2821 (HD 208174) : VIRTUAL EYEPIECE
 
 

21539+2821 WSI 8A mag 6.79 Sp A2 21539+2821 WSI 8B sep 0.1 P.A. 145.70 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 21539+2821 (HD 208174) : ALADIN DSS IMAGE @ 21h 53m 54.79s +28° 20' 32.0"
 
 
 
 
WDS 21539+2821 WSI 8 (HD 208174) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21539+2821 WSI 8 distance=0' 21524+2823 NSN 67 distance=21' 21556+2823 MLB 577BC distance=23' 21556+2823 MLB 577AB distance=23' 21540+2852 GRV 519 distance=33' 21553+2850 COU 836 distance=35' 21559+2753 HJ 1704 distance=37' 21538+2856 MLB 495 distance=38' 21561+2846 COU 837AB distance=39' 21561+2846 GII 104AC distance=39' 21521+2748 HO 171 distance=41' 21517+2852 SHN 256 distance=43' 21517+2856 HLD 49 distance=46' 21505+2756 AZC 116 distance=52' 21565+2900 HJ 1706 distance=53' 21503+2754 MLB 576 distance=55' 21575+2856 LEP 104 distance=60' 21580+2755 KPP3375 distance=60' 21555+2724 A 303AB distance=61' 21555+2724 STJ 1AC distance=61' 21573+2738 NSN 749 distance=62' 21510+2911 A 889AB distance=63' 21510+2911 A 889Aa,Ab distance=63' 21567+2721 GRV 521 distance=70' 21593+2800 MLB 578 distance=75' 21480+2819 MLB 541 distance=78' 21575+2923 UC 4612 distance=79' 21536+2701 ES 523 distance=79' 21530+2939 BRT 59 distance=81' 21585+2725 A 304AB distance=83' 21585+2725 A 304AB,C distance=83' 21561+2701 J 854 distance=85' 21555+2942 HO 609AB distance=85' 21555+2942 HO 609AC distance=85' 21555+2942 HO 609AD distance=85' 21555+2942 HO 609AE distance=85' 21474+2834 A 300AB distance=87' 21474+2834 A 300AC distance=87' 21474+2834 A 300AD distance=87' 21572+2938 TDT3258 distance=89' 21477+2740 CVR 922 distance=92' 21474+2855 AG 420 distance=93' 21553+2648 A 302 distance=95' 22001+2909 BRT 60 distance=95' 22012+2818 RAO 691 distance=97' 21547+2643 CVR 924 distance=99' 22013+2751 ES 527 distance=102' 21469+2907 CVR 919 distance=104' 22003+2922 MLB 497 distance=104' 21462+2817 MLB 540AB distance=105' 21462+2817 MLB 540AC distance=105' 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 21539+2821 WSI 8 142 0.1
Show 21524+2823 NSN 67 285 5.1 21
Show 21556+2823 MLB 577 BC 18 6.4 23
Show 21556+2823 MLB 577 AB 300 48.8 23
Show 21540+2852 GRV 519 318 22.1 33
Show 21553+2850 COU 836 161 1.3 35
Show 21559+2753 HJ 1704 317 5.6 37
Show 21538+2856 MLB 495 134 4.8 38
Show 21561+2846 COU 837 AB 150 1.2 39
Show 21561+2846 GII 104 AC 105 1.9 39
Show 21521+2748 HO 171 342 0.8 41
Show 21517+2852 SHN 256 -1 0.6 43
Show 21517+2856 HLD 49 341 2.1 46
Show 21505+2756 AZC 116 353 20.9 52
Show 21565+2900 HJ 1706 260 10.0 53
Show 21503+2754 MLB 576 267 13.1 55
Show 21575+2856 LEP 104 189 85.0 60
Show 21580+2755 KPP3375 114 14.2 60
Show 21555+2724 A 303 AB 52 2.3 61
Show 21555+2724 STJ 1 AC 337 3.4 61
Show 21573+2738 NSN 749 84 1.7 62
Show 21510+2911 A 889 AB 15 0.2 63
Show 21510+2911 A 889 Aa,Ab 323 0.0 63
Show 21567+2721 GRV 521 306 45.5 70
Show 21593+2800 MLB 578 151 3.1 75
Show 21480+2819 MLB 541 340 9.9 78
Show 21575+2923 UC 4612 23 64.1 79
Show 21536+2701 ES 523 95 6.2 79
Show 21530+2939 BRT 59 355 4.4 81
Show 21585+2725 A 304 AB 131 0.6 83
Show 21585+2725 A 304 AB,C 240 13.9 83
Show 21561+2701 J 854 305 2.8 85
Show 21555+2942 HO 609 AB 356 3.3 85
Show 21555+2942 HO 609 AC 132 22.1 85
Show 21555+2942 HO 609 AD 147 30.4 85
Show 21555+2942 HO 609 AE 347 31.7 85
Show 21474+2834 A 300 AB 252 2.3 87
Show 21474+2834 A 300 AC 29 7.5 87
Show 21474+2834 A 300 AD 170 8.4 87
Show 21572+2938 TDT3258 262 1.8 89
Show 21477+2740 CVR 922 225 9.9 92
Show 21474+2855 AG 420 145 7.5 93
Show 21553+2648 A 302 239 5.8 95
Show 22001+2909 BRT 60 163 4.0 95
Show 22012+2818 RAO 691 298 0.3 97
Show 21547+2643 CVR 924 252 21.1 99
Show 22013+2751 ES 527 214 3.5 102
Show 21469+2907 CVR 919 201 23.5 104
Show 22003+2922 MLB 497 185 7.7 104
Show 21462+2817 MLB 540 AB 256 4.1 105
Show 21462+2817 MLB 540 AC 322 8.7 105

 
 
WDS 21539+2821 : COMPONENTS
 
 
  A
B pa=145.7°
sep=0.11"
 
 
21539+2821 A
 
 
Componente originario normalizzato AB Name HD 208174 Coord arcsec 2000 215354.79+282032.0 Mag 6.79
Spectral class A2 (white) PmRA -160.00 PmDE -114.0 SAO 90085
HIP 108084 Tycho2 2214-01318-1 HD 208174 GC 30661
BD BD+27 4191
Tycho2
Tycho2 2214-01318-1 Pflag RAmdeg 328.47784638 DEmdeg 28.34193393
PmRA -162.1 PmDE -114.0 E RAmdeg 4 E DEmdeg 4
E pmRA 1.1 E pmDE 1.1 EpRAm 1991.28 EpDEm 1991.27
Num 15 Q RAmdeg 1.0 Q DEmdeg 1.0 Q pmRA 1.0
Q pmDE 1.0 BTmag 7.076 E BTmag 0.015 VTmag 6.800
E VTmag 0.010 Prox 999 TYC T HIP 108084
CCDM RAdeg 328.47827611 DEdeg 28.34220139 EpRA 1990 1.60
EpDE 1990 1.56 E RAdeg 4.1 E DEdeg 4.3 Posflg
Corr -0.1
SAO
SAO 90085 DelFlag RA1950 PmRA1950 -0.0121
DE1950 PmDE1950 -0.107 Vmag 6.7 SpType A2
Double code Source 70 CatNum 30661 DM BD+27 4191
DMcomp BDsup HD 208174 M HD 0
GC 30661 RA1950rad 5.72325528 DE1950rad 0.49055949 PmRA2000 -0.012
PmDE2000 -0.112
Hipparcos
Catalog H HIP 108084 Proxy RAhms 21 53 54.79
DEdms +28 20 32.0 Vmag 6.78 VarFlag R Vmag H
RAdeg 328.478 DEdeg 28.3422 AstroRef + Plx 9.16
CCDM N CCDM Nsys Ncomp 1
MultFlag O Source Qual M HIP
Theta Rho HD 208174 BD BD+27 4191
CD CP Dm number +27 4191 VIred 0.25
SpType A2 R SpType Coord arcsec 2000 215354.79+282032.0
Hipparcos 2
HIP 108084 Sn 75 So 4 Nc 1
RArad 5.7330277713 DErad 0.4946648715 Plx 9.56 PmRA -160.86
PmDE -113.57 E RArad 0.41 E DErad 0.36 E Plx 0.59
E pmRA 0.47 E pmDE 0.5 Hpmag 6.851 E Hpmag 0.001
SHp 0.008 VA 0 BV 0.27 E BV 0.009
VI 0.3
CCDM
Ccdm 21539+2821 RComp Comp A Note1
Note2 % Discov num DRAs 0.69 DDEs -29.0
R dRAs 82 Year Theta Rho
Obs 1 Vmag 6.8 Sp A2 PmNote
PmRA -160 PmDE -114 Dm number +27 4191 Cat1 BD
Name2 +28 2574 Cat2 AGK2/3 HD 208174 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 108084
 
 
21539+2821 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 215354.79+282031.9 Calc delta mag 6.79 Calc coord yes