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Doubles in session


Current system
21186+1134
BU 163 AB
HD 202908


Nearby doubles
11' : 21188+1144
HEI 880

24' : 21196+1153
BPM2359

32' : 21198+1108
GRV 446

33' : 21164+1128
CVR 892

34' : 21209+1140
BPM2361

44' : 21215+1122
BPM2363

45' : 21190+1218
BRT1354

49' : 21175+1221
HJ 279AB

60' : 21184+1233
BRT1352

60' : 21222+1114
J 2605

62' : 21223+1111
BRT1355

62' : 21224+1110
NSN 743

64' : 21143+1145
BPM2351

65' : 21142+1135
BPM2350

67' : 21225+1207
BPM2366

68' : 21181+1027
UC 4435

69' : 21225+1057
J 161

69' : 21139+1140
BPM2346

70' : 21227+1101
BPM2367

71' : 21191+1244
BPM2357

74' : 21140+1106
AG 415AB

75' : 21137+1115
BPM2345

81' : 21140+1219
BPM2348

81' : 21202+1018
HJ 933

85' : 21214+1020
A 617

86' : 21142+1231
HEI 406



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.

21186+1134 BU 163 AB (HD 202908)

 
 
21h 18m 34.85s +11° 34' 08.2" P.A. 257.00 sep 1.0 mag 7.31,8.88 Sp G2.7V+G5V dist. 47.66 pc (155.47 l.y.)
 
 
Coord 2000 21186+1134 Discov num BU  163 Comp AB Coord arcsec 2000 21 18 34.85 +11 34 08.2
Date first 1873 Date last 2021 Obs 229
Pa first 260 Pa last 257.3 P.A. Now (θ) 256.9°
Sep first 1.0 Sep last 0.954 Sep. Now (ρ) 0.946"
Mag pri 7.31 Mag sec 8.88 delta mag (ΔM) 1.57 Spectral class G2.7V+G5V (yellow/yellow)
Pri motion ra +032 Sec motion ra
Pri motion dec -056 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
21186+1134 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 202908 107015 21 18 35 +11 34 08 BU 163 AB 2021 229 257 1.0 7.31 8.88 1.57 Y <===
Show 107015 21 18 35 +11 34 08 BU 163 AC 2015 6 252 29.7 7.31 15.00 7.69
Show 107015 21 18 35 +11 34 08 BU 163 AD 2015 6 163 44.8 7.31 14.40 7.09
Show 107015 21 18 35 +11 34 08 BU 163 AE 2015 12 6 87.5 7.31 12.67 5.36
Quintuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 202908 Constellation Equuleus SAO 107015 HIP 105200
Tycho2 1113-00330-1 Gaia DR2 1746335802793081344 HD 202908 GC 29812
ADS 14839 BD BD+10 4514 Distance 47.66 Distance ly 155.47
 
 
ORBITAL ELEMENTS
 
 
Period (P)78.54y Periastron (T)1987.048y Semi-major axis (a)0.5177a
Eccentricity (e)0.8651 Inclination (i)100.36° Longitude of periastron (ω)171.92°
Node (Ω)255.03° Notesn ReferenceFek1997
Equinox Last observation Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 261.1 0.560
2001 260.8 0.591
2002 260.5 0.620
2003 260.2 0.648
2004 259.9 0.674
2005 259.7 0.699
2006 259.5 0.722
2007 259.3 0.744
2008 259.1 0.765
2009 258.9 0.785
2010 258.7 0.803
2011 258.6 0.820
2012 258.4 0.836
2013 258.2 0.851
2014 258.1 0.865
2015 258.0 0.878
2016 257.8 0.890
2017 257.7 0.901
2018 257.5 0.911
2019 257.4 0.920
2020 257.3 0.928
2021 257.1 0.935
2022 257.0 0.941
2023 256.9 0.946
2024 256.8 0.950
2025 256.7 0.953
2026 256.5 0.956
2027 256.4 0.957
2028 256.3 0.958
2029 256.2 0.957
2030 256.0 0.955


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


 
  


wds21186%2B1134a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 21186+1134 BU 163 AB (HD 202908) : NOTES
 
 
discov_num notes refcode
BU 163 A is a double-lined spectroscopic binary, period 4.0d.
1986.395, 1986.565: The separation of this difficult partially
resolved pair was calculated under the assumption that delta V = 1.2
magnitude, but the large number of measurements makes the result
reliable. The strange character of the observed motion (Tokovinin,
1986 Astron. Circ. No. 1415) is confirmed. Tok1985
Spectral types and masses of components assigned by ten Brummelaar et
al., based on adaptive optics observations. TtB2000
Mass-sum in good agreement with the complete speckle/spectroscopic Fek1997
analysis by Fekel et al. (1997). Sod1999
AB: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 2.44 +/- 1.33, 2.19, and 1.99 Msun, respectively. Mlk2012
 
 
REFERENCES
 
 
refcode metd author reference
Fek1997 Sc j Fekel, F.C., Scarfe, C.D., Barlow, D.J., Duquennoy, A., McAlister, H.A., 1997AJ....113.1095F
Fek1997 +orb Hartkopf, W.I., Mason, B.D., & Tokovinin, A.A.
Fek1997 AJ 113, 1095, 1997
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Sod1999 orb - Soderhjelm, S. 1999A&A...341..121S
Sod1999 A&A 341, 121, 1999
Tok1985 Ig u Tokovinin, A.A. 1985A&AS...61..483T
Tok1985 A&AS 61, 483, 1985
TtB2000 Ac j ten Brummelaar, T.A., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr., 2000AJ....119.2403T
TtB2000 Turner, N.H., Hartkopf, W.I., & Bagnuolo, W.G., Jr.
TtB2000 AJ 119, 2403, 2000 (magnitude differences from Mt. Wilson AO)
 
 
DISCOVERER
 
 
idgroup discov author
1 BU Burnham, S.W. (BU 1 - 81)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
21186+1134 BU 163 AB 2008 201 79 0.8 8.94 7.37 G0V+G6V NOD 211834.85+113408.2
21186+1134 BU 163 AB 2009 209 257 0.8 8.94 7.37 G0V+G6V NOD 211834.85+113408.2
21186+1134 BU 163 AB 2012 212 258 0.8 7.31 8.88 G0V G6V NOD 211834.85+113408.2
21186+1134 BU 163 AB 2014 216 258 0.9 7.31 8.88 G0V+G6V NO 211834.85+113408.2
21186+1134 BU 163 AB 2016 217 256 0.9 7.31 8.88 G0V+G6V NO 211834.85+113408.2
21186+1134 BU 163 AB 2017 223 258 0.9 7.31 8.88 G0V+G6V NO 211834.85+113408.2
21186+1134 BU 163 AB 2018 224 257 0.9 7.31 8.88 G0V+G6V NO 211834.85+113408.2
21186+1134 BU 163 AB 2021 229 257 1.0 7.31 8.88 G2.7V+G5V NO 211834.85+113408.2

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

 
 
WDS 21186+1134 BU 163 AB (HD 202908) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 21186+1134 BU 163 AB (HD 202908) : MEASURES
 
 
No records found.

 
 
WDS 21186+1134 (HD 202908) : VIRTUAL EYEPIECE
 
 

21186+1134 BU 163A mag 7.31 Sp G2.7V 21186+1134 BU 163B sep 0.9 P.A. 257.00 mag 8.88 Sp G5V 21186+1134 BU 163C sep 29.1 P.A. 252.10 mag 15 21186+1134 BU 163D sep 44.7 P.A. 162.90 mag 14.4 21186+1134 BU 163E sep 87.5 P.A. 6.00 mag 12.67 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 21186+1134 (HD 202908) : ALADIN DSS IMAGE @ 21h 18m 34.85s +11° 34' 08.2"
 
 
 
 
WDS 21186+1134 BU 163 AB (HD 202908) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

21186+1134 BU 163AB distance=0' 21188+1144 HEI 880 distance=11' 21196+1153 BPM2359 distance=24' 21198+1108 GRV 446 distance=32' 21164+1128 CVR 892 distance=33' 21209+1140 BPM2361 distance=34' 21215+1122 BPM2363 distance=44' 21190+1218 BRT1354 distance=45' 21175+1221 HJ 279AB distance=49' 21175+1221 HJ 279AC distance=49' 21184+1233 BRT1352 distance=60' 21222+1114 J 2605 distance=60' 21223+1111 BRT1355 distance=62' 21224+1110 NSN 743 distance=62' 21143+1145 BPM2351 distance=64' 21142+1135 BPM2350 distance=65' 21225+1207 BPM2366 distance=67' 21181+1027 UC 4435 distance=68' 21225+1057 J 161 distance=69' 21139+1140 BPM2346 distance=69' 21227+1101 BPM2367 distance=70' 21191+1244 BPM2357 distance=71' 21140+1106 TOB 316BC distance=74' 21140+1106 AG 415AB distance=74' 21137+1115 BPM2345 distance=75' 21140+1219 BPM2348 distance=81' 21202+1018 HJ 933 distance=81' 21214+1020 A 617 distance=85' 21142+1231 HEI 406 distance=86' 21138+1045 HJ 278 distance=86' 21130+1109 GWP3042 distance=87' 21248+1136 GWP3057 distance=92' 21123+1105 BPMA251 distance=97' 21128+1223 KPP4228 distance=98' 21236+1030 BRT1356 distance=99' 21206+1310 HDS3038 distance=101' 21254+1121 A 887AB distance=102' 21254+1121 A 887AC distance=102' 21254+1121 FYM 330AD distance=102' 21254+1121 FYM 330AE distance=102' 21116+1133 LDS4869 distance=103' 21179+0952 HJ 3019 distance=103' 21118+1205 GRV 434 distance=104' 21242+1237 HJ 282AB distance=104' 21242+1237 FYM 182AC distance=104' 21131+1028 BU 1501 distance=105' 21257+1140 BPM2374 distance=106' 21201+0947 UC 4444AB distance=109' 21121+1038 BUP 226BC distance=110' 21121+1038 ENG 81AB distance=111' 21145+1000 STT 535AB distance=112' 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 21186+1134 BU 163 AB 257 1.0
Show 21186+1134 BU 163 AC 252 29.7
Show 21186+1134 BU 163 AD 163 44.8
Show 21186+1134 BU 163 AE 6 87.5
Show 21188+1144 HEI 880 205 2.0 11
Show 21196+1153 BPM2359 145 89.8 24
Show 21198+1108 GRV 446 157 60.2 32
Show 21164+1128 CVR 892 185 7.0 33
Show 21209+1140 BPM2361 54 111.3 34
Show 21215+1122 BPM2363 196 52.2 44
Show 21190+1218 BRT1354 163 3.6 45
Show 21175+1221 HJ 279 AB 293 5.4 49
Show 21175+1221 HJ 279 AC 293 126.7 49
Show 21184+1233 BRT1352 183 5.0 60
Show 21222+1114 J 2605 223 1.5 60
Show 21223+1111 BRT1355 192 4.1 62
Show 21224+1110 NSN 743 262 2.3 62
Show 21143+1145 BPM2351 255 115.3 64
Show 21142+1135 BPM2350 144 29.1 65
Show 21225+1207 BPM2366 107 61.1 67
Show 21181+1027 UC 4435 259 50.5 68
Show 21225+1057 J 161 300 2.0 69
Show 21139+1140 BPM2346 245 17.4 69
Show 21227+1101 BPM2367 336 97.0 70
Show 21191+1244 BPM2357 65 34.9 71
Show 21140+1106 TOB 316 BC 87 21.1 74
Show 21140+1106 AG 415 AB 23 15.9 74
Show 21137+1115 BPM2345 10 52.4 75
Show 21140+1219 BPM2348 161 95.7 81
Show 21202+1018 HJ 933 239 17.0 81
Show 21214+1020 A 617 45 0.0 85
Show 21142+1231 HEI 406 179 0.7 86
Show 21138+1045 HJ 278 263 22.9 86
Show 21130+1109 GWP3042 113 25.6 87
Show 21248+1136 GWP3057 181 11.2 92
Show 21123+1105 BPMA251 305 252.8 97
Show 21128+1223 KPP4228 149 2.3 98
Show 21236+1030 BRT1356 63 5.7 99
Show 21206+1310 HDS3038 126 0.1 101
Show 21254+1121 A 887 AB 213 0.1 102
Show 21254+1121 A 887 AC 322 12.3 102
Show 21254+1121 FYM 330 AD 79 22.9 102
Show 21254+1121 FYM 330 AE 61 16.2 102
Show 21116+1133 LDS4869 267 203.8 103
Show 21179+0952 HJ 3019 309 15.0 103
Show 21118+1205 GRV 434 169 65.4 104
Show 21242+1237 HJ 282 AB 69 27.3 104
Show 21242+1237 FYM 182 AC 162 14.9 104
Show 21131+1028 BU 1501 210 1.0 105
Show 21257+1140 BPM2374 142 74.8 106
Show 21201+0947 UC 4444 AB 170 74.7 109

 
 
WDS 21186+1134 : COMPONENTS
 
 
  A B C D
B pa=257.0°
sep=0.94"
 
C pa=252.1°
sep=29.15"
pa=251.9°
sep=28.21"
 
D pa=162.9°
sep=44.73"
pa=161.7°
sep=44.81"
pa=129.6°
sep=53.02"
 
E pa=6.0°
sep=87.50"
pa=6.6°
sep=87.80"
pa=21.0°
sep=102.82"
pa=358.2°
sep=129.84"
 
 
21186+1134 A
 
 
Name HD 202908 Coord arcsec 2000 211834.85+113408.2 Mag 7.31 Spectral class G2.7V (yellow)
PmRA 32.00 PmDE -56.0 SAO 107015 HIP 105200
Tycho2 1113-00330-1 HD 202908 GC 29812 ADS 14839
BD BD+10 4514
Tycho2
Tycho2 1113-00330-1 Pflag RAmdeg 319.64529696 DEmdeg 11.56881299
PmRA 27.8 PmDE -54.6 E RAmdeg 4 E DEmdeg 5
E pmRA 1.4 E pmDE 1.3 EpRAm 1991.50 EpDEm 1991.18
Num 12 Q RAmdeg 1.5 Q DEmdeg 1.2 Q pmRA 1.4
Q pmDE 1.1 BTmag 7.730 E BTmag 0.016 VTmag 7.081
E VTmag 0.011 Prox 999 TYC T HIP 105200
CCDM AB RAdeg 319.64523139 DEdeg 11.56894194 EpRA 1990 1.66
EpDE 1990 1.48 E RAdeg 4.4 E DEdeg 5.2 Posflg P
Corr 0.0
SAO
SAO 107015 DelFlag RA1950 PmRA1950 -0.0004
DE1950 PmDE1950 -0.035 Vmag 7 SpType G0
Double code Source 70 CatNum 29812 DM BD+10 4514
DMcomp BDsup HD 202908 M HD 0
GC 29812 RA1950rad 5.56830539 DE1950rad 0.1982445 PmRA2000 -0.0003
PmDE2000 -0.039
Hipparcos
Catalog H HIP 105200 Proxy H RAhms 21 18 34.85
DEdms +11 34 08.2 Vmag 7.01 VarFlag R Vmag H
RAdeg 319.645 DEdeg 11.5689 AstroRef * Plx 19.79
CCDM 21186+1134 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual B M HIP AB
Theta 268 Rho 0.23 HD 202908 BD BD+10 4514
CD CP Dm number +10 4514 VIred 0.66
SpType G0V R SpType Coord arcsec 2000 211834.85+113408.2
Hipparcos 2
HIP 105200 Sn 55 So 3 Nc 2
RArad 5.5788616535 DErad 0.2019161542 Plx 20.98 PmRA 34.7
PmDE -48.91 E RArad 0.51 E DErad 0.37 E Plx 0.58
E pmRA 0.58 E pmDE 0.45 Hpmag 7.1435 E Hpmag 0.001
SHp 0.009 VA 0 BV 0.605 E BV 0.009
VI 0.67
CCDM
Ccdm 21186+1134 RComp Comp A Note1
Note2 Discov num DRAs -1.21 DDEs 7.0
R dRAs 10 Year Theta Rho
Obs 5 Vmag 7.2 Sp G0 PmNote *
PmRA 10 PmDE -63 Dm number +10 4514 Cat1 BD
Name2 +11 2644 Cat2 AGK2/3 HD 202908 M HD
ADS BDS A14839 M ADS BDS N IDS IDS 21138N1109A
HIC 105200
 
 
21186+1134 B
 
 
Coord arcsec 2000 211834.79+113408.0 Mag 8.88 Spectral class G5V (yellow) Calc delta mag 1.57
Calc coord yes
CCDM
Ccdm 21186+1134 RComp Comp B Note1 *
Note2 Discov num BU 163 DRAs DDEs
R dRAs Year 1876 Theta Rho
Obs 99 Vmag 9.1 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14839 M ADS BDS N IDS IDS 21138N1109B
HIC 105200
 
 
21186+1134 C
 
 
Coord arcsec 2000 211832.96+113359.2 Mag 15 Calc delta mag 7.69 Calc coord yes
CCDM
Ccdm 21186+1134 RComp Comp C Note1
Note2 Discov num BU 163 DRAs DDEs
R dRAs Year 1908 Theta 242 Rho 28.9
Obs 1 Vmag 13.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14839 M ADS BDS N IDS IDS 21138N1109C
HIC
 
 
21186+1134 D
 
 
Coord arcsec 2000 211835.74+113325.4 Mag 14.4 Calc delta mag 7.09 Calc coord yes
CCDM
Ccdm 21186+1134 RComp Comp D Note1
Note2 Discov num BU 163 DRAs DDEs
R dRAs Year 1908 Theta 161 Rho 50.2
Obs 1 Vmag 12.9 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14839 M ADS BDS N IDS IDS 21138N1109D
HIC
 
 
21186+1134 E
 
 
Coord arcsec 2000 211835.47+113535.2 Mag 12.67 PmRA 4.00 PmDE 0.0
Calc delta mag 5.36 Calc coord yes
CCDM
Ccdm 21186+1134 RComp Comp E Note1
Note2 Discov num BU 163 DRAs DDEs
R dRAs Year 1901 Theta 009 Rho 82.6
Obs 3 Vmag 10.8 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A14839 M ADS BDS N IDS IDS 21138N1109E
HIC