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Doubles in session


Current system
20108+2029
HDS 2875
HD 191721


Nearby doubles
19' : 20119+2020
J 1876

20' : 20115+2013
GRV 320

27' : 20124+2043
NSN 730

29' : 20099+2055
STF2637AB

29' : 20113+2056
J 1875

32' : 20086+2041
BRT2467

33' : 20093+2004
HU 355

34' : 20099+2100
S 737

35' : 20120+2100
HJ 907AB

41' : 20136+2021
BU 1484

43' : 20138+2021
HJ 2941

51' : 20131+2107
GRV 323

52' : 20082+2105
J 1168

53' : 20113+2121
HO 587

58' : 20078+1950
WEB 12

60' : 20124+2124
DAM1255

62' : 20072+2106
STF2631

63' : 20102+2131
TDT2042

68' : 20125+1924
J 3059

68' : 20154+2045
BRT2469

70' : 20065+1957
J 1233AB

70' : 20063+1954
WAK 19

70' : 20129+1924
J 3060

74' : 20103+1915
J 3053

75' : 20109+1915
J 3055

76' : 20156+1958
ROE 101AB



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.

20108+2029 HDS 2875 (HD 191721)

 
 
20h 10m 45.15s +20° 29' 12.7" P.A. 231.00 sep 0.3 mag 7.61,9.46 Sp B8 dist. 452.49 pc (1476.02 l.y.)
 
 
Coord 2000 20108+2029 Discov num HDS2875 Comp Coord arcsec 2000 20 10 45.15 +20 29 12.7
Date first 1991 Date last 2011 Obs 4
Pa first 231 Pa last 230.9 P.A. Now (θ) 230.9°
Sep first 0.3 Sep last 0.306 Sep. Now (ρ) 0.306"
Mag pri 7.61 Mag sec 9.46 delta mag (ΔM) 1.85 Spectral class B8 (blue-white)
Pri motion ra -002 Sec motion ra
Pri motion dec -008 Sec motion dec
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 191721 Constellation Sagitta SAO 88299 HIP 99421
Tycho2 1626-00634-1 Gaia DR2 1828813777784480128 HD 191721 BD BD+20 4461
Distance 452.49 Distance ly 1476.02
 
 
WDS 20108+2029 HDS 2875 (HD 191721) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
HDS Hipparcos Double Star (from additional DD list) ...................
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20108+2029 HDS2875 1997 2 235 0.3 7.61 9.46 B8 201045.15+202912.7
20108+2029 HDS2875 2009 3 230 0.3 7.61 9.46 B8 201045.15+202912.7
20108+2029 HDS2875 2011 4 231 0.3 7.61 9.46 B8 201045.15+202912.7

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

 
 
WDS 20108+2029 HDS 2875 (HD 191721) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20108+2029 HDS 2875 (HD 191721) : MEASURES
 
 
No records found.

 
 
WDS 20108+2029 (HD 191721) : VIRTUAL EYEPIECE
 
 

20108+2029 HDS2875A mag 7.61 Sp B8 20108+2029 HDS2875B sep 0.3 P.A. 229.10 mag 9.46 virtual eyepiece
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Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 20108+2029 (HD 191721) : ALADIN DSS IMAGE @ 20h 10m 45.15s +20° 29' 12.7"
 
 
 
 
WDS 20108+2029 HDS 2875 (HD 191721) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20108+2029 HDS2875 distance=1' 20119+2020 J 1876 distance=19' 20115+2013 GRV 320 distance=20' 20124+2043 NSN 730 distance=27' 20099+2055 STF2637AB distance=29' 20099+2055 STF2637AD distance=29' 20099+2055 STF2637AC distance=29' 20099+2055 STF2637BC distance=29' 20113+2056 J 1875 distance=29' 20086+2041 BRT2467 distance=32' 20093+2004 HU 355 distance=33' 20099+2100 S 737 distance=34' 20120+2100 HJ 907AB distance=35' 20120+2100 HJ 907AC distance=35' 20136+2021 BU 1484 distance=41' 20138+2021 HJ 2941 distance=43' 20131+2107 GRV 323 distance=51' 20082+2105 J 1168 distance=52' 20113+2121 HO 587 distance=53' 20078+1950 WEB 12 distance=58' 20124+2124 DAM1255 distance=60' 20072+2106 STF2631 distance=62' 20102+2131 TDT2042 distance=63' 20125+1924 J 3059 distance=68' 20154+2045 BRT2469 distance=68' 20065+1957 J 1233AB distance=70' 20065+1957 DAM 191AC distance=70' 20065+1957 DAM 191BD distance=70' 20063+1954 WAK 19 distance=70' 20129+1924 J 3060 distance=70' 20103+1915 J 3053 distance=74' 20109+1915 J 3055 distance=75' 20156+1958 ROE 101AB distance=76' 20156+1958 ROE 101AC distance=76' 20156+1958 ROE 101AD distance=76' 20156+1958 ROE 101AE distance=76' 20163+2033 HDS2888 distance=79' 20051+2039 BUP 203AB distance=81' 20051+2039 BUP 203AC distance=81' 20051+2039 BLL 44AD distance=81' 20153+2120 J 3067 distance=82' 20153+1937 UC 249 distance=83' 20076+2139 TDT2000 distance=83' 20132+2145 J 1194 distance=84' 20136+2145 J 834 distance=86' 20045+2009 BRT2465 distance=90' 20173+2009 J 3071 distance=95' 20137+1904 J 3062 distance=95' 20123+1856 J 3056 distance=95' 20039+2034 COU 216 distance=97' 20177+2025 J 2308BC distance=98' 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 20108+2029 HDS2875 231 0.3 1
Show 20119+2020 J 1876 99 8.2 19
Show 20115+2013 GRV 320 152 31.3 20
Show 20124+2043 NSN 730 146 3.2 27
Show 20099+2055 STF2637 AB 331 11.6 29
Show 20099+2055 STF2637 AD 226 172.8 29
Show 20099+2055 STF2637 AC 222 91.9 29
Show 20099+2055 STF2637 BC 215 95.7 29
Show 20113+2056 J 1875 100 8.8 29
Show 20086+2041 BRT2467 55 4.4 32
Show 20093+2004 HU 355 352 1.2 33
Show 20099+2100 S 737 128 101.0 34
Show 20120+2100 HJ 907 AB 137 5.7 35
Show 20120+2100 HJ 907 AC 229 20.1 35
Show 20136+2021 BU 1484 323 23.7 41
Show 20138+2021 HJ 2941 109 6.2 43
Show 20131+2107 GRV 323 204 19.0 51
Show 20082+2105 J 1168 193 0.9 52
Show 20113+2121 HO 587 65 11.5 53
Show 20078+1950 WEB 12 77 40.1 58
Show 20124+2124 DAM1255 23 7.1 60
Show 20072+2106 STF2631 339 4.7 62
Show 20102+2131 TDT2042 359 0.6 63
Show 20125+1924 J 3059 155 7.1 68
Show 20154+2045 BRT2469 60 3.9 68
Show 20065+1957 J 1233 AB 245 6.9 70
Show 20065+1957 DAM 191 AC 179 9.8 70
Show 20065+1957 DAM 191 BD 218 9.8 70
Show 20063+1954 WAK 19 166 2.0 70
Show 20129+1924 J 3060 196 6.3 70
Show 20103+1915 J 3053 248 7.7 74
Show 20109+1915 J 3055 61 5.6 75
Show 20156+1958 ROE 101 AB 53 12.7 76
Show 20156+1958 ROE 101 AC 187 40.9 76
Show 20156+1958 ROE 101 AD 289 11.9 76
Show 20156+1958 ROE 101 AE 59 46.1 76
Show 20163+2033 HDS2888 283 0.6 79
Show 20051+2039 BUP 203 AB 247 13.4 81
Show 20051+2039 BUP 203 AC 102 59.4 81
Show 20051+2039 BLL 44 AD 95 75.3 81
Show 20153+2120 J 3067 140 6.3 82
Show 20153+1937 UC 249 165 83.5 83
Show 20076+2139 TDT2000 71 0.7 83
Show 20132+2145 J 1194 115 6.3 84
Show 20136+2145 J 834 277 2.3 86
Show 20045+2009 BRT2465 209 3.0 90
Show 20173+2009 J 3071 219 6.1 95
Show 20137+1904 J 3062 9 5.7 95
Show 20123+1856 J 3056 256 6.3 95
Show 20039+2034 COU 216 218 0.5 97
Show 20177+2025 J 2308 BC 297 5.7 98

 
 
WDS 20108+2029 : COMPONENTS
 
 
  A
B pa=229.1°
sep=0.29"
 
 
20108+2029 A
 
 
Componente originario normalizzato AB Name HD 191721 Coord arcsec 2000 201045.15+202912.7 Mag 7.61
Spectral class B8 (blue-white) PmRA -2.00 PmDE -8.0 SAO 88299
HIP 99421 Tycho2 1626-00634-1 HD 191721 BD BD+20 4461
Tycho2
Tycho2 1626-00634-1 Pflag RAmdeg 302.68812363 DEmdeg 20.48684755
PmRA 1.1 PmDE -7.3 E RAmdeg 4 E DEmdeg 5
E pmRA 1.2 E pmDE 1.1 EpRAm 1991.61 EpDEm 1991.31
Num 10 Q RAmdeg 1.0 Q DEmdeg 1.0 Q pmRA 0.9
Q pmDE 1.1 BTmag 7.357 E BTmag 0.015 VTmag 7.440
E VTmag 0.011 Prox 999 TYC T HIP 99421
CCDM AB RAdeg 302.68812083 DEdeg 20.48686472 EpRA 1990 1.80
EpDE 1990 1.62 E RAdeg 4.2 E DEdeg 4.8 Posflg P
Corr 0.2
SAO
SAO 88299 DelFlag RA1950 PmRA1950 0.001
DE1950 PmDE1950 -0.009 Vmag 7 SpType B8
Double code Source 35 CatNum 7528 DM BD+20 4461
DMcomp BDsup HD 191721 M HD 0
GC RA1950rad 5.27324918 DE1950rad 0.35495804 PmRA2000 0.0011
PmDE2000 -0.011
Hipparcos
Catalog H HIP 99421 Proxy H RAhms 20 10 45.15
DEdms +20 29 12.7 Vmag 7.45 VarFlag R Vmag H
RAdeg 302.688 DEdeg 20.4869 AstroRef * Plx 0.75
CCDM 20108+2029 N CCDM H Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 231 Rho 0.266 HD 191721 BD BD+20 4461
CD CP Dm number +20 4461 VIred -0.03
SpType B8 R SpType Coord arcsec 2000 201045.15+202912.7
Hipparcos 2
HIP 99421 Sn 55 So 3 Nc 2
RArad 5.2829042918 DErad 0.3575632194 Plx 2.21 PmRA -0.87
PmDE -7.58 E RArad 0.55 E DErad 0.49 E Plx 0.7
E pmRA 0.83 E pmDE 0.67 Hpmag 7.4279 E Hpmag 0.0013
SHp 0.011 VA 0 BV -0.08 E BV 0.009
VI -0.06
CCDM
Ccdm 20108+2029 RComp Comp A Note1
Note2 Discov num DRAs -2.85 DDEs 12.7
R dRAs 82 Year Theta Rho
Obs 2 Vmag 7.6 Sp B8 PmNote *
PmRA -2 PmDE -8 Dm number +20 4461 Cat1 BD
Name2 +20 2213 Cat2 AGK2/3 HD 191721 M HD
ADS BDS M ADS BDS N IDS IDS
HIC 99421
 
 
20108+2029 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 201045.13+202912.5 Mag 9.46 Calc delta mag 1.85
Calc coord yes
CCDM
Ccdm 20108+2029 RComp Comp B Note1
Note2 Discov num HDS DRAs -2.86 DDEs 12.5
R dRAs 82 Year 1991 Theta 231 Rho 0.3
Obs 1 Vmag 9.5 Sp PmNote *
PmRA -2 PmDE -8 Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS
HIC 99421