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Current system
17564+1820
MCA 49 Aa,Ab


Nearby doubles
11' : 17568+1811
LDS1003

12' : 17569+1811
J 1352

15' : 17557+1830
HDS2528

15' : 17567+1806
J 459

29' : 17584+1812
J 3268

45' : 17568+1736
BPM 710

47' : 17569+1906
RAO 381

52' : 17595+1753
BPM 715

63' : 17533+1904
KU 56AB

67' : 17579+1923
KPP 406

72' : 18014+1811
GWP2756

75' : 17524+1733
BPM 703

75' : 18005+1734
COU 809

76' : 17577+1707
AG 357

76' : 18007+1736
COU 810

78' : 17510+1821
HDS2517

83' : 18019+1754
LEP 156

86' : 18008+1721
GWP2752

87' : 17537+1702
BPM 706

89' : 18024+1758
BPM 717

93' : 17513+1723
TDT 536

93' : 17524+1708
TDT 550

96' : 17527+1940
BRT2439

97' : 17503+1737
BPM 702

98' : 17530+1655
CRC 27AB

109' : 17547+1633
UC 234



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Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

17564+1820 MCA 49 Aa,Ab

 
 
17h 56m 24.41s +18° 19' 37.1" P.A. 286.00 sep 0.1 mag 7.60,8.40 Sp A0III dist. 240.96 pc (786.01 l.y.)
 
 
Coord 2000 17564+1820 Discov num MCA  49 Comp Aa,Ab Coord arcsec 2000 17 56 24.41 +18 19 37.1
Date first 1979 Date last 2021 Obs 24
Pa first 58 Pa last 285.8 P.A. Now (θ) 285.8°
Sep first 0.1 Sep last 0.108 Sep. Now (ρ) 0.108"
Mag pri 7.60 Mag sec 8.40 delta mag (ΔM) 0.8 Spectral class A0III (white)
Pri motion ra +002 Sec motion ra
Pri motion dec -012 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
17564+1820 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 103227 17 56 24 +18 19 37 MCA 49 Aa,Ab 2021 24 286 0.1 7.60 8.40 0.80 <===
Show HD 163640 103227 17 56 24 +18 19 38 STF 2245 BA 2021 203 112 2.7 7.43 7.55 0.12
Triple system
2 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Hercules SAO 103227 HIP 87823 Tycho2 1557-01939-2
Gaia DR2 4503405877106880768 HD 163640 BD BD+18 3500 Distance 240.96
Distance ly 786.01
 
 
WDS 17564+1820 MCA 49 Aa,Ab : NOTES
 
 
discov_num notes refcode
MCA 49 Aa,Ab: 1980.4820: This measure was incorrectly attributed to HR 6148
by McAlister et al. (1983). McA1983
 
 
REFERENCES
 
 
refcode metd author reference
McA1983 Sc j McAlister, H.A., Hendry, E.M., Hartkopf, W.I., Campbell, B.G., & Fekel, F.C. 1983ApJS...51..309M
McA1983 ApJS 51, 309, 1983
 
 
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
17564+1820 MCA 49 Aa,Ab 1996 16 70 0.1 6.60   A0III N 175624.41+181937.3
17564+1820 MCA 49 Aa,Ab 2009 18 92 0.1 6.60   A0III N 175624.41+181937.3
17564+1820 MCA 49 Aa,Ab 2015 20 276 0.1 7.60 8.40 A0III N 175624.41+181937.3
17564+1820 MCA 49 Aa,Ab 2017 21 100 0.1 7.60 8.40 A0III N 175624.41+181937.1
17564+1820 MCA 49 Aa,Ab 2019 22 286 0.1 7.60 8.40 A0III N 175624.41+181937.1
17564+1820 MCA 49 Aa,Ab 2021 24 286 0.1 7.60 8.40 A0III N 175624.41+181937.1

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

 
 
WDS 17564+1820 MCA 49 Aa,Ab : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 17564+1820 MCA 49 Aa,Ab : MEASURES
 
 
No records found.

 
 
WDS 17564+1820 : VIRTUAL EYEPIECE
 
 

17564+1820 STF2245A mag 7.55 17564+1820 MCA 49Ab mag 8.4 17564+1820 STF2245B sep 2.5 P.A. 293.10 mag 7.43 Sp A0III 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 17564+1820 : ALADIN DSS IMAGE @ 17h 56m 24.41s +18° 19' 37.1"
 
 
 
 
WDS 17564+1820 MCA 49 Aa,Ab : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

17564+1820 MCA 49Aa,Ab distance=1' 17564+1820 STF2245BA distance=1' 17568+1811 LDS1003 distance=11' 17569+1811 J 1352 distance=12' 17557+1830 HDS2528 distance=15' 17567+1806 J 459 distance=15' 17584+1812 J 3268 distance=29' 17568+1736 BPM 710 distance=45' 17569+1906 RAO 381 distance=47' 17595+1753 BPM 715 distance=52' 17533+1904 KU 56AB distance=63' 17533+1904 KU 56AC distance=63' 17579+1923 KPP 406 distance=67' 18014+1811 GWP2756 distance=72' 17524+1733 BPM 703 distance=75' 18005+1734 COU 809 distance=75' 17577+1707 AG 357 distance=76' 18007+1736 COU 810 distance=76' 17510+1821 HDS2517 distance=78' 18019+1754 LEP 156 distance=83' 18008+1721 GWP2752 distance=86' 17537+1702 BPM 706 distance=87' 18024+1758 BPM 717 distance=89' 17513+1723 TDT 536 distance=93' 17524+1708 TDT 550 distance=93' 17527+1940 BRT2439 distance=96' 17503+1737 BPM 702 distance=97' 17530+1655 CRC 27Aa,Ab distance=98' 17530+1655 CRC 27AB distance=98' 17547+1633 UC 234 distance=109' 17596+1638 UC 3466 distance=112' 17590+1631 DAM 98 distance=115' 17589+1629 DAM 97AB distance=116' 17589+1629 DAM 97AC distance=116' 17589+1629 DAM 97AD distance=116' 17595+2009 UC 3465 distance=118' 18016+1953 RAO 383 distance=119' 17547+2016 OSO 88 distance=120' 17487+1728 DAM 280 distance=122' 17483+1740 BPM 700 distance=123' 17476+1831 UC 3409 distance=127' 17484+1727 ARG 79 distance=127' 18031+1654 BPM 718 distance=129' 18052+1739 KPP4082 distance=133' 17573+1607 HEI 256 distance=134' 17544+2030 BRT2837 distance=134' 18051+1912 KPP1682 distance=134' 17538+1610 BPM 707 distance=136' 17471+1742 STF2215 distance=138' 17591+1613 J 1135AB distance=139' 17591+1613 J 1135AC distance=139' 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 17564+1820 MCA 49 Aa,Ab 286 0.1 1
Show 17564+1820 STF2245 BA 112 2.7 1
Show 17568+1811 LDS1003 111 161.5 11
Show 17569+1811 J 1352 23 3.9 12
Show 17557+1830 HDS2528 253 18.5 15
Show 17567+1806 J 459 55 3.4 15
Show 17584+1812 J 3268 216 4.0 29
Show 17568+1736 BPM 710 52 47.5 45
Show 17569+1906 RAO 381 45 0.2 47
Show 17595+1753 BPM 715 26 115.9 52
Show 17533+1904 KU 56 AB 127 2.8 63
Show 17533+1904 KU 56 AC 3 25.2 63
Show 17579+1923 KPP 406 52 3.8 67
Show 18014+1811 GWP2756 318 261.9 72
Show 17524+1733 BPM 703 353 82.3 75
Show 18005+1734 COU 809 26 2.1 75
Show 17577+1707 AG 357 190 2.9 76
Show 18007+1736 COU 810 99 0.2 76
Show 17510+1821 HDS2517 211 0.5 78
Show 18019+1754 LEP 156 92 5.0 83
Show 18008+1721 GWP2752 83 479.5 86
Show 17537+1702 BPM 706 287 69.6 87
Show 18024+1758 BPM 717 250 115.6 89
Show 17513+1723 TDT 536 61 1.1 93
Show 17524+1708 TDT 550 32 0.5 93
Show 17527+1940 BRT2439 181 4.7 96
Show 17503+1737 BPM 702 294 118.8 97
Show 17530+1655 CRC 27 Aa,Ab 112 0.9 98
Show 17530+1655 CRC 27 AB 31 9.0 98
Show 17547+1633 UC 234 204 32.4 109
Show 17596+1638 UC 3466 182 42.0 112
Show 17590+1631 DAM 98 249 7.7 115
Show 17589+1629 DAM 97 AB 103 10.8 116
Show 17589+1629 DAM 97 AC 223 8.1 116
Show 17589+1629 DAM 97 AD 140 4.5 116
Show 17595+2009 UC 3465 90 51.0 118
Show 18016+1953 RAO 383 223 0.6 119
Show 17547+2016 OSO 88 34 27.9 120
Show 17487+1728 DAM 280 177 5.6 122
Show 17483+1740 BPM 700 143 67.0 123
Show 17476+1831 UC 3409 235 19.2 127
Show 17484+1727 ARG 79 119 30.1 127
Show 18031+1654 BPM 718 52 42.0 129
Show 18052+1739 KPP4082 45 31.7 133
Show 17573+1607 HEI 256 349 2.1 134
Show 17544+2030 BRT2837 281 2.8 134
Show 18051+1912 KPP1682 17 13.0 134
Show 17538+1610 BPM 707 132 98.6 136
Show 17471+1742 STF2215 249 0.4 138
Show 17591+1613 J 1135 AB 174 6.7 139
Show 17591+1613 J 1135 AC 194 26.9 139

 
 
WDS 17564+1820 : COMPONENTS
 
 
  A Ab
Ab pa=318.9°
sep=0.04"
 
B pa=293.1°
sep=2.55"
pa=292.7°
sep=2.52"
 
 
17564+1820 A
 
 
Componente generatrice A Coord arcsec 2000 175624.40+181937.1 Mag 7.55 PmRA -2.00
PmDE -12.0 SAO 103227 HIP 87823 Tycho2 1557-01939-2
HD 163640 GC 24401 BD BD+18 3500 Calc delta mag 0.12
Calc coord yes
Tycho2
Tycho2 1557-01939-2 Pflag P RAmdeg 269.10161631 DEmdeg 18.32703998
PmRA -0.1 PmDE -11.3 E RAmdeg 5 E DEmdeg 5
E pmRA 1.3 E pmDE 1.3 EpRAm 1991.51 EpDEm 1991.43
Num 6 Q RAmdeg 1.4 Q DEmdeg 0.8 Q pmRA 1.5
Q pmDE 0.8 BTmag 8.760 E BTmag 0.017 VTmag 7.549
E VTmag 0.011 Prox 26 TYC T HIP 87823
CCDM B RAdeg 269.10101306 DEdeg 18.32729694 EpRA 1990 1.69
EpDE 1990 1.61 E RAdeg 4.7 E DEdeg 5.3 Posflg D
Corr -0.1
SAO
SAO 103227 DelFlag RA1950 PmRA1950 0.0009
DE1950 PmDE1950 -0.01 Vmag 7.3 SpType A2
Double code Source 70 CatNum 24401 DM BD+18 3500
DMcomp A BDsup HD 163640 M HD 1
GC 24401 RA1950rad 4.68714139 DE1950rad 0.31996649 PmRA2000 0.001
PmDE2000 -0.009
Hipparcos
Catalog H HIP 87823 Proxy H RAhms 17 56 24.41
DEdms +18 19 37.3 Vmag 6.66 VarFlag R Vmag G
RAdeg 269.102 DEdeg 18.327 AstroRef A Plx 4.73
CCDM 17564+1820 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP AB
Theta 292 Rho 2.613 HD 163640 BD BD+18 3500
CD CP Dm number +18 3500 VIred 0.47
SpType A0III R SpType Coord arcsec 2000 175624.41+181937.3
Hipparcos 2
HIP 87823 Sn 15 So 3 Nc 2
RArad 4.6967110424 DErad 0.319866943 Plx 4.15 PmRA -3.11
PmDE -10.12 E RArad 0.79 E DErad 0.7 E Plx 0.95
E pmRA 0.97 E pmDE 0.7 Hpmag 6.7573 E Hpmag 0.0008
SHp 0.009 VA 0 BV 0.4 E BV 0.015
VI 0.47
CCDM
Ccdm 17564+1820 RComp Comp A Note1
Note2 Discov num DRAs 0.49 DDEs -23.1
R dRAs 10 Year Theta Rho
Obs 2 Vmag 7.4 Sp A2 PmNote *
PmRA 11 PmDE -9 Dm number +18 3500 Cat1 BD
Name2 103227 Cat2 SAO HD 163640 M HD
ADS BDS A10905 M ADS BDS N IDS IDS 17520N1821A
HIC 87823
 
 
17564+1820 Ab
 
 
Coord arcsec 2000 175624.40+181937.1 Mag 8.4 Calc delta mag 0.8 Calc coord yes
 
 
17564+1820 B
 
 
Name HD 163640 Coord arcsec 2000 175624.24+181938.1 Mag 7.43 Spectral class A0III (white)
PmRA 2.00 PmDE -11.0 Tycho2 1557-01939-1 Calc delta mag 0.17
Tycho2
Tycho2 1557-01939-1 Pflag P RAmdeg 269.10161631 DEmdeg 18.32703998
PmRA -0.1 PmDE -11.3 E RAmdeg 5 E DEmdeg 5
E pmRA 1.3 E pmDE 1.3 EpRAm 1991.51 EpDEm 1991.43
Num 6 Q RAmdeg 1.4 Q DEmdeg 0.8 Q pmRA 1.5
Q pmDE 0.8 BTmag 7.429 E BTmag 0.015 VTmag 7.426
E VTmag 0.010 Prox 26 TYC T HIP 87823
CCDM A RAdeg 269.10172111 DEdeg 18.32702639 EpRA 1990 1.72
EpDE 1990 1.62 E RAdeg 4.0 E DEdeg 4.3 Posflg D
Corr -0.2
CCDM
Ccdm 17564+1820 RComp Comp B Note1
Note2 Discov num STF2245 DRAs 0.26 DDEs -21.9
R dRAs 10 Year 1829 Theta 293 Rho 2.6
Obs 99 Vmag 7.4 Sp PmNote *
PmRA 1 PmDE -11 Dm number Cat1
Name2 103226 Cat2 SAO HD M HD
ADS BDS A10905 M ADS BDS N IDS IDS 17520N1821B
HIC 87823