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Doubles in session


Current system
18352+1812
CHR 74
HD 171623


Nearby doubles
15' : 18346+1801
SLE 206

32' : 18343+1841
MET 85AB

35' : 18346+1739
BPM 791

35' : 18341+1742
J 2915AB

36' : 18338+1744
HU 322AB

40' : 18372+1839
TDT 961

42' : 18378+1752
BPM 794

47' : 18327+1741
TDT 934

49' : 18320+1754
SLE 621

52' : 18387+1800
GRV 235

53' : 18332+1730
J 98

54' : 18324+1737
GWP2782

59' : 18320+1735
KPP1183

60' : 18381+1729
SLE 224

62' : 18338+1911
TDT 936

63' : 18341+1712
SLE 202AB

63' : 18308+1803
BPMA 56

64' : 18370+1910
J 799

66' : 18333+1713
SLE 193

66' : 18324+1720
SLE 622

69' : 18342+1705
SLE 203AB

72' : 18402+1815
TDT 986

74' : 18322+1713
SLE 189

75' : 18359+1659
STT 358AB

76' : 18336+1700
SLE 197AB

78' : 18319+1710
BRT1302



Selections
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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.

18352+1812 CHR 74 (HD 171623)

 
 
18h 35m 12.59s +18° 12' 12.2" P.A. 25.00 sep 0.1 mag 5.78, Sp A0Vn dist. 198.41 pc (647.21 l.y.)
 
 
Coord 2000 18352+1812 Discov num CHR  74 Comp Coord arcsec 2000 18 35 12.59 +18 12 12.2
Date first 1985 Date last 2021 Obs 19
Pa first 212 Pa last 24.6 P.A. Now (θ) 24.6°
Sep first 0.2 Sep last 0.149 Sep. Now (ρ) 0.149"
Mag pri 5.78 Mag sec delta mag (ΔM) Spectral class A0Vn (white)
Pri motion ra +016 Sec motion ra
Pri motion dec +008 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 171623 Constellation Hercules SAO 103879 HIP 91118
Tycho2 1574-02056-1 Gaia DR2 4524091573480285696 HD 171623 HR 6977
GC 25398 BD BD+18 3740 Distance 198.41 Distance ly 647.21
 
 
ORBITAL ELEMENTS
 
 
Period (P)68.4y± 1.6 Periastron (T)2042.1y± 2.3 Semi-major axis (a)168.4m± 1.5
Eccentricity (e)0± 0.02 Inclination (i)116.6°± 0.6 Longitude of periastron (ω)139°± 12
Node (Ω)40.2°± 0.9 Notes ReferenceHor2015b
Equinox2000 Last observation2014 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 114.0 0.078
2001 103.5 0.082
2002 94.3 0.089
2003 86.4 0.096
2004 79.7 0.104
2005 74.0 0.113
2006 69.1 0.121
2007 64.9 0.129
2008 61.1 0.137
2009 57.7 0.144
2010 54.7 0.151
2011 51.8 0.156
2012 49.2 0.161
2013 46.6 0.164
2014 44.2 0.167
2015 41.8 0.168
2016 39.5 0.168
2017 37.1 0.167
2018 34.7 0.165
2019 32.2 0.162
2020 29.6 0.158
2021 26.8 0.153
2022 23.9 0.147
2023 20.6 0.140
2024 17.0 0.132
2025 12.9 0.124
2026 8.3 0.116
2027 2.9 0.107
2028 356.6 0.099
2029 349.2 0.091
2030 340.5 0.085


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


 
  


wds18352%2B1812a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18352+1812 CHR 74 (HD 171623) : NOTES
 
 
discov_num notes refcode
CHR 74 A well-known speckle binary whose first interferometric observations
date from the CHARA speckle program in the mid-1980's, this object
went unobserved from 1996 until the present work. The new data suggest
that nearly half an orbit has been completed since the first speckle
observation. The primary is probably close to an A0V star, and with a
magnitude difference of perhaps 2-2.5, we estimate that the secondary
is an F2V star. This would suggest a mass sum in the range 4-5 Msun,
which is lower than what is implied by the value of P and a we derive,
together with the Hipparcos parallax of 5.04 +/- 0.39 mas. We expect
that the next decade will provide an opportunity to improve upon the
orbit presented here since the separation will be above 0.1 arcsec and
the position angle is expected to cover about 30deg. We encourage
other observers to put this object back on their observing lists for
the next few years. Hor2015b
 
 
REFERENCES
 
 
refcode metd author reference
Hor2015b S j Horch, E.P., van Belle, G.T., Davidson, J.W., Jr., Ciastko, L.A., Everett, M.E., & 2015AJ....150..151H
Hor2015b Bjorkman, K.S.
Hor2015b AJ 150, 151, 2015
 
 
DISCOVERER
 
 
idgroup discov author
1 CHR Center for High Ang. Res. Astronomy (speckle interferometry systems)
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18352+1812 CHR 74 1996 13 156 0.1 5.78   A0Vn 183512.59+181212.2
18352+1812 CHR 74 2014 15 43 0.2 5.78   A0Vn 183512.59+181212.2
18352+1812 CHR 74 2015 16 41 0.2 5.78   A0Vn 183512.59+181212.2
18352+1812 CHR 74 2018 18 34 0.2 5.78   A0Vn N 183512.59+181212.2
18352+1812 CHR 74 2021 19 25 0.1 5.78   A0Vn N 183512.59+181212.2

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

 
 
WDS 18352+1812 CHR 74 (HD 171623) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18352+1812 CHR 74 (HD 171623) : MEASURES
 
 
No records found.

 
 
WDS 18352+1812 (HD 171623) : VIRTUAL EYEPIECE
 
 

18352+1812 CHR 74A mag 5.78 Sp A0Vn 18352+1812 CHR 74B sep 0.1 P.A. 23.50 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 18352+1812 (HD 171623) : ALADIN DSS IMAGE @ 18h 35m 12.59s +18° 12' 12.2"
 
 
 
 
WDS 18352+1812 CHR 74 (HD 171623) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18352+1812 CHR 74 distance=0' 18346+1801 SLE 206 distance=15' 18343+1841 MET 85AB distance=32' 18343+1841 MET 85AC distance=32' 18343+1841 MET 85AD distance=32' 18343+1841 MET 85AE distance=32' 18343+1841 MET 85AF distance=32' 18346+1739 BPM 791 distance=35' 18341+1742 J 2915AB distance=35' 18341+1742 J 2915AC distance=35' 18338+1744 HU 322AB distance=36' 18338+1744 STF2339AB,CD distance=36' 18338+1744 WAK 21CD distance=36' 18372+1839 TDT 961 distance=40' 18378+1752 BPM 794 distance=42' 18327+1741 TDT 934 distance=47' 18320+1754 SLE 621 distance=49' 18387+1800 GRV 235 distance=52' 18332+1730 J 98 distance=53' 18324+1737 GWP2782 distance=54' 18320+1735 KPP1183 distance=59' 18381+1729 SLE 224 distance=60' 18338+1911 TDT 936 distance=62' 18341+1712 SLE 202BC distance=62' 18341+1712 SLE 202AB distance=63' 18341+1712 SLE 202AC distance=63' 18308+1803 BPMA 56 distance=63' 18370+1910 J 799 distance=64' 18333+1713 SLE 193 distance=66' 18324+1720 SLE 622 distance=66' 18342+1705 SLE 203AB distance=69' 18342+1705 SLE 203AC distance=69' 18342+1705 SLE 203BC distance=70' 18402+1815 TDT 986 distance=72' 18322+1713 SLE 189 distance=74' 18359+1659 STT 358AB distance=75' 18359+1659 RED 25AB,E distance=75' 18359+1659 SLE 214AB,D distance=75' 18359+1659 STT 358AB,C distance=75' 18336+1700 SLE 197AB distance=76' 18336+1700 SLE 197AD distance=76' 18336+1700 SLE 197AC distance=76' 18336+1700 SLE 197BC distance=76' 18359+1659 SLE 214CD distance=76' 18319+1710 BRT1302 distance=78' 18389+1715 BPM 799 distance=79' 18380+1705 SLE 223 distance=79' 18365+1931 FMR 231AB distance=81' 18365+1931 RAO 394Aa,Ab distance=81' 18298+1747 BRT2447 distance=81' 18407+1749 ROE 88AB distance=82' 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 18352+1812 CHR 74 25 0.1
Show 18346+1801 SLE 206 225 13.2 15
Show 18343+1841 MET 85 AB 87 1.8 32
Show 18343+1841 MET 85 AC 35 2.7 32
Show 18343+1841 MET 85 AD 307 6.2 32
Show 18343+1841 MET 85 AE 114 6.9 32
Show 18343+1841 MET 85 AF 182 12.3 32
Show 18346+1739 BPM 791 203 58.8 35
Show 18341+1742 J 2915 AB 190 6.1 35
Show 18341+1742 J 2915 AC 84 7.1 35
Show 18338+1744 HU 322 AB 92 0.2 36
Show 18338+1744 STF2339 AB,CD 277 1.7 36
Show 18338+1744 WAK 21 CD 263 0.5 36
Show 18372+1839 TDT 961 332 0.8 40
Show 18378+1752 BPM 794 108 96.4 42
Show 18327+1741 TDT 934 128 0.8 47
Show 18320+1754 SLE 621 53 12.4 49
Show 18387+1800 GRV 235 331 7.8 52
Show 18332+1730 J 98 147 3.9 53
Show 18324+1737 GWP2782 115 47.5 54
Show 18320+1735 KPP1183 64 9.2 59
Show 18381+1729 SLE 224 20 17.3 60
Show 18338+1911 TDT 936 349 0.8 62
Show 18341+1712 SLE 202 BC 71 17.0 62
Show 18341+1712 SLE 202 AB 70 51.7 63
Show 18341+1712 SLE 202 AC 70 68.7 63
Show 18308+1803 BPMA 56 152 293.6 63
Show 18370+1910 J 799 78 2.6 64
Show 18333+1713 SLE 193 291 9.6 66
Show 18324+1720 SLE 622 301 48.7 66
Show 18342+1705 SLE 203 AB 267 56.0 69
Show 18342+1705 SLE 203 AC 279 63.2 69
Show 18342+1705 SLE 203 BC 333 14.3 70
Show 18402+1815 TDT 986 145 0.5 72
Show 18322+1713 SLE 189 111 12.8 74
Show 18359+1659 STT 358 AB 146 1.7 75
Show 18359+1659 RED 25 AB,E 349 34.6 75
Show 18359+1659 SLE 214 AB,D 224 134.6 75
Show 18359+1659 STT 358 AB,C 235 198.7 75
Show 18336+1700 SLE 197 AB 211 28.3 76
Show 18336+1700 SLE 197 AD 306 37.2 76
Show 18336+1700 SLE 197 AC 177 34.0 76
Show 18336+1700 SLE 197 BC 120 19.2 76
Show 18359+1659 SLE 214 CD 77 72.0 76
Show 18319+1710 BRT1302 56 6.0 78
Show 18389+1715 BPM 799 29 56.5 79
Show 18380+1705 SLE 223 126 15.4 79
Show 18365+1931 FMR 231 AB 86 15.1 81
Show 18365+1931 RAO 394 Aa,Ab 233 0.2 81
Show 18298+1747 BRT2447 359 2.8 81
Show 18407+1749 ROE 88 AB 131 8.4 82

 
 
WDS 18352+1812 : COMPONENTS
 
 
  A
B pa=23.5°
sep=0.15"
 
 
18352+1812 A
 
 
Componente originario normalizzato AB Name HD 171623 Coord arcsec 2000 183512.59+181212.2 Mag 5.78
Spectral class A0Vn (white) PmRA 16.00 PmDE 8.0 HIP 91118
Tycho2 1574-02056-1 HD 171623 HR 6977 BD BD+18 3740
Tycho2
Tycho2 1574-02056-1 Pflag RAmdeg 278.80250112 DEmdeg 18.20340409
PmRA 17.5 PmDE 5.5 E RAmdeg 4 E DEmdeg 3
E pmRA 1.0 E pmDE 0.9 EpRAm 1991.49 EpDEm 1991.58
Num 14 Q RAmdeg 0.8 Q DEmdeg 0.7 Q pmRA 0.6
Q pmDE 0.7 BTmag 5.778 E BTmag 0.014 VTmag 5.780
E VTmag 0.009 Prox 999 TYC T HIP 91118
CCDM RAdeg 278.80245861 DEdeg 18.20339139 EpRA 1990 1.74
EpDE 1990 1.73 E RAdeg 3.5 E DEdeg 3.4 Posflg
Corr 0.1
Hipparcos
Catalog H HIP 91118 Proxy RAhms 18 35 12.59
DEdms +18 12 12.2 Vmag 5.79 VarFlag R Vmag H
RAdeg 278.802 DEdeg 18.2034 AstroRef Plx 4.82
CCDM N CCDM Nsys Ncomp 1
MultFlag Source Qual S M HIP
Theta Rho HD 171623 BD BD+18 3740
CD CP Dm number +18 3740 VIred 0.01
SpType A0Vn R SpType Coord arcsec 2000 183512.59+181212.2
Hipparcos 2
HIP 91118 Sn 5 So 0 Nc 1
RArad 4.8660208283 DErad 0.3177091283 Plx 5.04 PmRA 21.89
PmDE 7.8 E RArad 0.24 E DErad 0.26 E Plx 0.39
E pmRA 0.28 E pmDE 0.34 Hpmag 5.7972 E Hpmag 0.0006
SHp 0.006 VA 0 BV 0.006 E BV 0.004
VI 0.03
CCDM
Ccdm 18352+1812 RComp Comp A Note1
Note2 Discov num DRAs 0.66 DDEs 11.8
R dRAs 81 Year Theta Rho
Obs 2 Vmag 5.8 Sp A0 PmNote @
PmRA 30 PmDE -1 Dm number +18 3740 Cat1 BD
Name2 +18 1730 Cat2 AGK2/3 HD 171623 M HD
ADS BDS M ADS BDS N IDS W IDS 18352+1812A
HIC 91118
 
 
18352+1812 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 183512.59+181212.3 SAO 103879 GC 25398
DM BD+18 3740 Calc delta mag 5.78 Calc coord yes
SAO
SAO 103879 DelFlag RA1950 PmRA1950 0.0009
DE1950 PmDE1950 0.006 Vmag 5.7 SpType A0
Double code Source 70 CatNum 25398 DM BD+18 3740
DMcomp BDsup HD 171623 M HD 0
GC 25398 RA1950rad 4.85641195 DE1950rad 0.31698723 PmRA2000 0.001
PmDE2000 0.006
CCDM
Ccdm 18352+1812 RComp Comp B Note1
Note2 Discov num CHR 74 DRAs DDEs
R dRAs Year 1992 Theta 185 Rho 0.1
Obs 6 Vmag Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS W IDS 18352+1812B
HIC 91118