stampa
Login

About to create a great list of doubles? Share it with other users!
Create your account here


Search



Actions
Advanced Search
Go to Simbad
New report
New measure
Login


Computed Lists
Populars
Latest Populars
Doubles in session


Current system
18393+2056
STF 2360
HD 172421


Nearby doubles
30' : 18412+2111
TDT 994

38' : 18399+2019
L 64

41' : 18389+2019
L 63

43' : 18368+2120
HU 323

49' : 18425+2116
BRT2448

51' : 18369+2019
L 62

51' : 18408+2142
HU 324

54' : 18355+2104
STF2345

63' : 18359+2018
L 60

64' : 18363+2143
COU 206

66' : 18369+2021
L 61

70' : 18361+2003
TDS 931

71' : 18443+2052
HU 325

72' : 18343+2101
TDT 939

75' : 18353+2145
COU 205

80' : 18366+2206
HJ 2834

81' : 18430+1955
TDS 936

82' : 18444+2015
ALD 4AB

82' : 18335+2102
COU 204AB

82' : 18405+1936
OSO 102AB

87' : 18426+2209
COU 208

87' : 18389+2222
COU 207

89' : 18444+2003
GRV 238

92' : 18457+2033
HJ 2839AB

93' : 18420+2221
TDT1008

94' : 18365+1931
FMR 231AB



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.

18393+2056 STF 2360 (HD 172421)

 
 
18h 39m 19.16s +20° 55' 58.9" P.A. 358.00 sep 2.5 mag 7.97,9.16 Sp B5IV dist. 2500 pc (8155 l.y.)
 
 
Coord 2000 18393+2056 Discov num STF2360 Comp Coord arcsec 2000 18 39 19.16 +20 55 58.9
Date first 1828 Date last 2016 Obs 72
Pa first 358 Pa last 358.4 P.A. Now (θ) 358.4°
Sep first 2.4 Sep last 2.454 Sep. Now (ρ) 2.454"
Mag pri 7.97 Mag sec 9.16 delta mag (ΔM) 1.19 Spectral class B5IV (blue-white)
Pri motion ra -005 Sec motion ra -002
Pri motion dec -016 Sec motion dec -008
Notes
rPM=0.51
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 172421 Constellation Hercules SAO 86288 HIP 91468
Tycho2 1582-00314-1 Gaia DR2 4531754001284452992 HD 172421 GC 25521
BD BD+20 3880 Distance 2500 Distance ly 8155
 
 
WDS 18393+2056 STF 2360 (HD 172421) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
STFA (F. Struve DD - Appendix list #1) ...................
STFB (F. Struve DD - Appendix list #2) ...................
StF1833A Ma - Struve, F.G.W. 1833MmRAS...5...13H
StF1833A +Mc cited by Herschel (MemRAS 5, 13, 1833)
StF1833B Ma - Struve, F.G.W. 1833AN.....10..389B
StF1833B cited by Bessel (AN 10, 389, 1833)
StF1837 Ma - Struve, F.G.W. 1837AN.....14...249
StF1837 Stellarum duplicium et multiplicium mensurae micrometricae...
StF1837 (Dorpat, Academiae scientiarum caesareae petropolitaneifique), 1837
StF1844A Ma - Struve, F.G.W. 1844QB43.S66.......
StF1844A cited by Smyth (Cycle of Celestial Objects 2, 1844)
StF1852A Ma - Struve, F.G.W. .
StF1852A cited by Bishop (Bishop Obs. Astron. Observations 1852)
StF1865A Ma - Struve, F.G.W. 1865AN.....64...81E
StF1865A cited by Engelmann (AN 64, 81, #1518, 1865)
StF1875A Ma - Struve, F.G.W. 1875AN.....85..323D
StF1875A cited by Doberck, 1875 (see Dob1875b,f,g,h)
StF1878 Ma - Struve, F.G.W. .
StF1878 Pulkova Observations 9, 1878
StF1878B Ma - Struve, F.G.W. 1878Obs.....2..239G
StF1878B cited by Gledhill (Obs 2, 239, 1878)
StF1880A Ma - Struve, F.G.W. 1880Obs.....3..535G
StF1880A cited by Gledhill (Obs 3, 535, 1880)
StF1906A Ma - Struve, F.G.W. 1906QB821.B972.....
StF1906A cited in BDS (Burnham Double Star Cat.), 1906
StF1906B Ma - Struve, F.G.W. 1906MmRAS..56....1L
StF1906B cited by Lewis (MemRAS 56, 1, 1906)
StF1922A Ma - Struve, F.G.W. 1922AN....216...49R
StF1922A cited by Rabe (AN 216, 49, 1922)
StF1932A Ma - Struve, F.G.W. 1932QB821.A43......
StF1932A cited in ADS (Aitken Double Star Cat.), 1932
StF2002 - - Weis, J.
StF2002 F. G. W. Struve's double stars : the Dorpat catalogue; the Pulkovo catalogue
StF2002 USNO Library : QB 821 .S8 W49 2002
StF2022 - - email note from Jan Weis: 6 July 2022
StF9999 Ma - Struve, F.G.W. ...................
StF9999 Unpublished, manuscript or reference not found.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18393+2056 STF2360 2000 81 358 2.4 7.97 9.16 B5IV D 183919.16+205558.9
18393+2056 STF2360 2006 82 358 2.4 7.97 9.16 B5IV D 183919.16+205558.9
18393+2056 STF2360 2008 83 358 2.4 7.97 9.16 B5IV D 183919.16+205558.9
18393+2056 STF2360 2011 85 358 2.4 7.97 9.16 B5IV D 183919.16+205558.9
18393+2056 STF2360 2016 72 358 2.5 7.97 9.16 B5IV 183919.16+205558.9

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

 
 
WDS 18393+2056 STF 2360 (HD 172421) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18393+2056 STF 2360 (HD 172421) : MEASURES
 
 
No records found.

 
 
WDS 18393+2056 (HD 172421) : VIRTUAL EYEPIECE
 
 

18393+2056 STF2360A mag 7.97 Sp B5IV 18393+2056 STF2360B sep 2.5 P.A. 358.50 mag 9.16 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 18393+2056 (HD 172421) : ALADIN DSS IMAGE @ 18h 39m 19.16s +20° 55' 58.9"
 
 
 
 
WDS 18393+2056 STF 2360 (HD 172421) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18393+2056 STF2360 distance=1' 18412+2111 TDT 994 distance=30' 18399+2019 L 64 distance=38' 18389+2019 L 63 distance=41' 18368+2120 HU 323 distance=43' 18425+2116 BRT2448 distance=49' 18369+2019 L 62 distance=51' 18408+2142 HU 324 distance=51' 18355+2104 STF2345 distance=54' 18359+2018 L 60 distance=63' 18363+2143 COU 206 distance=64' 18369+2021 L 61 distance=66' 18361+2003 TDS 931 distance=70' 18443+2052 HU 325 distance=71' 18343+2101 TDT 939 distance=72' 18353+2145 COU 205 distance=75' 18366+2206 HJ 2834 distance=80' 18430+1955 TDS 936 distance=81' 18444+2015 ALD 4AB distance=82' 18444+2015 DAM 640AC distance=82' 18335+2102 COU 204AB distance=82' 18405+1936 OSO 102AB distance=82' 18405+1936 OSO 102AC distance=82' 18426+2209 COU 208 distance=87' 18389+2222 COU 207 distance=87' 18444+2003 GRV 238 distance=89' 18457+2033 HJ 2839AB distance=92' 18457+2033 HJ 2839AC distance=92' 18457+2033 HJ 2839AD distance=92' 18457+2033 HJ 2839AE distance=92' 18420+2221 TDT1008 distance=93' 18365+1931 FMR 231AB distance=94' 18365+1931 RAO 394Aa,Ab distance=94' 18406+2230 TDT 989 distance=96' 18432+1928 BU 645 distance=104' 18320+2031 LAW 18 distance=106' 18370+1910 J 799 distance=111' 18316+2030 COU 119 distance=112' 18443+2224 HU 1657 distance=113' 18473+2125 GRV 239 distance=117' 18442+2231 COU 209AB distance=117' 18442+2231 COU 209AC distance=117' 18333+2219 LEP 89 distance=118' 18354+2243 SLE 212 distance=121' 18331+2221 KPP 419 distance=121' 18449+2234 HDS2655 distance=126' 18474+1957 TDT1056 distance=128' 18482+2028 TDT1060 distance=129' 18324+2221 J 807 distance=130' 18445+1913 J 466 distance=130' 18338+1911 TDT 936 distance=131' 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 18393+2056 STF2360 358 2.5 1
Show 18412+2111 TDT 994 27 0.7 30
Show 18399+2019 L 64 74 4.1 38
Show 18389+2019 L 63 63 2.7 41
Show 18368+2120 HU 323 143 0.2 43
Show 18425+2116 BRT2448 294 3.8 49
Show 18369+2019 L 62 314 6.2 51
Show 18408+2142 HU 324 113 0.9 51
Show 18355+2104 STF2345 225 12.3 54
Show 18359+2018 L 60 188 2.5 63
Show 18363+2143 COU 206 149 0.1 64
Show 18369+2021 L 61 279 5.4 66
Show 18361+2003 TDS 931 49 1.2 70
Show 18443+2052 HU 325 6 0.4 71
Show 18343+2101 TDT 939 180 0.5 72
Show 18353+2145 COU 205 148 0.1 75
Show 18366+2206 HJ 2834 246 19.7 80
Show 18430+1955 TDS 936 157 2.0 81
Show 18444+2015 ALD 4 AB 338 4.1 82
Show 18444+2015 DAM 640 AC 169 11.0 82
Show 18335+2102 COU 204 AB 130 11.9 82
Show 18405+1936 OSO 102 AB 99 17.3 82
Show 18405+1936 OSO 102 AC 36 20.3 82
Show 18426+2209 COU 208 304 0.3 87
Show 18389+2222 COU 207 298 1.6 87
Show 18444+2003 GRV 238 345 36.6 89
Show 18457+2033 HJ 2839 AB 57 74.8 92
Show 18457+2033 HJ 2839 AC 59 73.0 92
Show 18457+2033 HJ 2839 AD 336 25.4 92
Show 18457+2033 HJ 2839 AE 13 61.1 92
Show 18420+2221 TDT1008 41 2.4 93
Show 18365+1931 FMR 231 AB 86 15.1 94
Show 18365+1931 RAO 394 Aa,Ab 233 0.2 94
Show 18406+2230 TDT 989 233 2.4 96
Show 18432+1928 BU 645 305 9.3 104
Show 18320+2031 LAW 18 18 1.4 106
Show 18370+1910 J 799 78 2.6 111
Show 18316+2030 COU 119 229 0.7 112
Show 18443+2224 HU 1657 244 0.3 113
Show 18473+2125 GRV 239 244 7.6 117
Show 18442+2231 COU 209 AB 38 2.1 117
Show 18442+2231 COU 209 AC 204 39.8 117
Show 18333+2219 LEP 89 302 49.1 118
Show 18354+2243 SLE 212 255 14.3 121
Show 18331+2221 KPP 419 170 3.7 121
Show 18449+2234 HDS2655 196 0.3 126
Show 18474+1957 TDT1056 171 4.6 128
Show 18482+2028 TDT1060 175 0.6 129
Show 18324+2221 J 807 310 3.7 130
Show 18445+1913 J 466 214 2.9 130
Show 18338+1911 TDT 936 349 0.8 131

 
 
WDS 18393+2056 : COMPONENTS
 
 
  A
B pa=358.5°
sep=2.45"
 
 
18393+2056 A
 
 
Componente originario normalizzato AB Name HD 172421 Coord arcsec 2000 183919.16+205558.9 Mag 7.97
Spectral class B5IV (blue-white) PmRA -5.00 PmDE -16.0 SAO 86288
HIP 91468 Tycho2 1582-00314-1 HD 172421 GC 25521
BD BD+20 3880
Tycho2
Tycho2 1582-00314-1 Pflag RAmdeg 279.82984324 DEmdeg 20.93301926
PmRA -0.8 PmDE -17.9 E RAmdeg 5 E DEmdeg 5
E pmRA 1.5 E pmDE 1.4 EpRAm 1991.30 EpDEm 1991.37
Num 6 Q RAmdeg 0.4 Q DEmdeg 5.6 Q pmRA 0.4
Q pmDE 5.8 BTmag 7.935 E BTmag 0.016 VTmag 7.970
E VTmag 0.011 Prox 24 TYC T HIP 91468
CCDM A RAdeg 279.82984528 DEdeg 20.93305972 EpRA 1990 1.54
EpDE 1990 1.61 E RAdeg 4.8 E DEdeg 4.8 Posflg D
Corr 0.0
SAO
SAO 86288 DelFlag RA1950 PmRA1950 -0.0003
DE1950 PmDE1950 -0.014 Vmag 7.8 SpType B8
Double code Source 70 CatNum 25521 DM BD+20 3880
DMcomp BDsup HD 172421 M HD 0
GC 25521 RA1950rad 4.87459908 DE1950rad 0.36454186 PmRA2000 -0.0002
PmDE2000 -0.014
Hipparcos
Catalog H HIP 91468 Proxy H RAhms 18 39 19.16
DEdms +20 55 59.0 Vmag 7.67 VarFlag R Vmag G
RAdeg 279.83 DEdeg 20.9331 AstroRef A Plx 2.41
CCDM 18393+2056 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 359 Rho 2.466 HD 172421 BD BD+20 3880
CD CP Dm number +20 3880 VIred 0
SpType B6V+... R SpType Coord arcsec 2000 183919.16+205559.0
Hipparcos 2
HIP 91468 Sn 15 So 3 Nc 2
RArad 4.8839521619 DErad 0.3653507901 Plx -0.4 PmRA -1.15
PmDE -8.7 E RArad 0.69 E DErad 0.66 E Plx 1.01
E pmRA 1.03 E pmDE 1.05 Hpmag 7.6688 E Hpmag 0.0017
SHp 0.014 VA 0 BV -0.02 E BV 0.015
VI 0
CCDM
Ccdm 18393+2056 RComp Comp A Note1
Note2 Discov num DRAs 1.11 DDEs -0.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 7.8 Sp B8 PmNote *
PmRA -11 PmDE -9 Dm number +20 3880 Cat1 BD
Name2 +20 1938 Cat2 AGK2/3 HD 172421 M HD
ADS BDS A11546 M ADS BDS N IDS IDS 18350N2051A
HIC 91468
 
 
18393+2056 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 183919.16+205601.4 Mag 9.16 PmRA -2.00
PmDE -8.0 Calc delta mag 1.19 Calc coord yes
CCDM
Ccdm 18393+2056 RComp Comp B Note1
Note2 Discov num STF2360 DRAs DDEs
R dRAs Year 1950 Theta 357 Rho 2.4
Obs 23 Vmag 9.0 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A11546 M ADS BDS N IDS IDS 18350N2051B
HIC 91468