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Doubles in session


Current system
20507-3116
B 997
HD 198340


Nearby doubles
14' : 20516-3123
KPP2645

14' : 20511-3103
RST2163

16' : 20517-3109
LDS5913

18' : 20503-3058
LDS5911

29' : 20500-3049
RST2161

31' : 20485-3126
B 996

33' : 20519-3047
UC 4313

40' : 20479-3132
B 995

72' : 20452-3120
LDS 720AB

72' : 20452-3122
WOR 40

73' : 20452-3057
FAL 70AB

76' : 20554-3202
TDT2631

77' : 20448-3112
TDT2516

77' : 20562-3146
B 1001

83' : 20454-3029
HJ 5218

84' : 20561-3201
JSP 818

90' : 20552-3008
HDS2980

90' : 20517-2947
RST2164

92' : 20440-3147
JSP 816

94' : 20516-2943
DAM 668

94' : 20563-3216
JSP 819

95' : 20529-3245
B 1000

97' : 20451-3221
LDS5910

99' : 20543-3243
UC 4321AB

100' : 20521-2938
FIN 5

101' : 20510-3256
RST2162



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.

20507-3116 B 997 (HD 198340)

 
 
20h 50m 41.84s -31° 15' 45.4" P.A. 273.00 sep 0.2 mag 8.66,10.10 Sp F8V dist. 91.74 pc (299.26 l.y.)
 
 
Coord 2000 20507-3116 Discov num B   997 Comp Coord arcsec 2000 20 50 41.84 -31 15 45.4
Date first 1927 Date last 2019 Obs 26
Pa first 95 Pa last 273.4 P.A. Now (θ) 291.1°
Sep first 0.3 Sep last 0.165 Sep. Now (ρ) 0.185"
Mag pri 8.66 Mag sec 10.10 delta mag (ΔM) 1.44 Spectral class F8V (yellow-white)
Pri motion ra -032 Sec motion ra
Pri motion dec +002 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 198340 Constellation Microscopium SAO 212486 HIP 102892
Tycho2 7457-01611-1 Gaia DR2 6793908156489111936 HD 198340 CD CD-3117886
CP CP-31 6359 Distance 91.74 Distance ly 299.26
 
 
ORBITAL ELEMENTS
 
 
Period (P)63.67y± 34.66 Periastron (T)2014.34y± 14.29 Semi-major axis (a)0.207a± 0.053
Eccentricity (e)0.179± 0.142 Inclination (i)41.5°± 8.1 Longitude of periastron (ω)306.4°± 141.1
Node (Ω)281.1°± 27.2 Notesn ReferenceTok2015c
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 120.2 0.200
2001 124.8 0.192
2002 129.8 0.184
2003 135.3 0.176
2004 141.4 0.168
2005 148.1 0.159
2006 155.5 0.151
2007 163.7 0.144
2008 172.8 0.138
2009 182.5 0.133
2010 192.8 0.131
2011 203.2 0.131
2012 213.6 0.133
2013 223.4 0.136
2014 232.7 0.142
2015 241.2 0.148
2016 249.0 0.154
2017 256.2 0.161
2018 262.8 0.167
2019 269.0 0.173
2020 274.8 0.177
2021 280.4 0.181
2022 285.8 0.183
2023 291.1 0.185
2024 296.2 0.186
2025 301.4 0.186
2026 306.6 0.185
2027 311.9 0.184
2028 317.2 0.182
2029 322.6 0.180
2030 328.2 0.178


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


 
  


wds20507-3116a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 20507-3116 B 997 (HD 198340) : NOTES
 
 
discov_num notes refcode
B 997 Malkov et al. (2012) derive dynamical, photometric, and spectroscopic
masses of 1.39 +/- 0.85, 2.28, and 1.10 Msun, respectively. Mlk2012
 
 
REFERENCES
 
 
refcode metd author reference
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Tok2015c orb+j Tokovinin, A., Mason, B.D., Hartkopf, W.I., Mendez, R.A., & Horch, E.P. 2015AJ....150...50T
Tok2015c +St AJ 150, 50, 2015 (some measures corrected in Tok2017b) 2017AJ....154..110T
 
 
DISCOVERER
 
 
idgroup discov author
1 B van den Bos, W.H.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20507-3116 B 997 1992 22 94 0.2 8.66 10.10 F8V NO 205041.84-311545.4
20507-3116 B 997 2008 23 180 0.1 8.66 10.10 F8V NO 205041.84-311545.4
20507-3116 B 997 2014 24 240 0.1 8.66 10.10 F8V NO 205041.84-311545.4
20507-3116 B 997 2017 25 262 0.2 8.66 10.10 F8V NO 205041.84-311545.4
20507-3116 B 997 2019 26 273 0.2 8.66 10.10 F8V NO 205041.84-311545.4

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

 
 
WDS 20507-3116 B 997 (HD 198340) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20507-3116 B 997 (HD 198340) : MEASURES
 
 
No records found.

 
 
WDS 20507-3116 (HD 198340) : VIRTUAL EYEPIECE
 
 

20507-3116 B 997A mag 8.66 Sp F8V 20507-3116 B 997B sep 0.1 P.A. 274.00 mag 10.1 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 20507-3116 (HD 198340) : ALADIN DSS IMAGE @ 20h 50m 41.84s -31° 15' 45.4"
 
 
 
 
WDS 20507-3116 B 997 (HD 198340) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20507-3116 B 997 distance=0' 20516-3123 KPP2645 distance=14' 20511-3103 RST2163 distance=14' 20517-3109 LDS5913 distance=16' 20503-3058 LDS5911 distance=18' 20500-3049 RST2161 distance=29' 20485-3126 B 996 distance=31' 20519-3047 UC 4313 distance=33' 20479-3132 B 995 distance=40' 20452-3120 LDS 720AB distance=72' 20452-3122 WOR 40 distance=72' 20452-3057 FAL 70AB distance=73' 20452-3057 TOK 340AC distance=73' 20554-3202 TDT2631 distance=76' 20448-3112 TDT2516 distance=77' 20562-3146 B 1001 distance=77' 20452-3057 JSP 817CD distance=79' 20454-3029 HJ 5218 distance=83' 20561-3201 JSP 818 distance=84' 20552-3008 HDS2980 distance=90' 20517-2947 RST2164 distance=90' 20440-3147 JSP 816 distance=92' 20516-2943 DAM 668 distance=94' 20563-3216 JSP 819 distance=94' 20529-3245 B 1000 distance=95' 20451-3221 LDS5910 distance=97' 20451-3221 KPP3118Aa,Ab distance=97' 20543-3243 TDT2622Aa,Ab distance=99' 20543-3243 UC 4321AB distance=99' 20521-2938 FIN 5 distance=100' 20510-3256 RST2162 distance=101' 20530-2937 B 506 distance=103' 20467-3245 RST2160 distance=103' 20584-3043 JSP 821 distance=104' 20478-3255 WIS 343 distance=106' 20517-3303 UC 4311 distance=109' 20516-2927 TOK 863Aa,Ab distance=110' 20593-3139 KPP2180 distance=113' 20441-3000 SKF1248 distance=114' 20434-3005 LDS5909 distance=116' 20424-3031 H N 101AB distance=117' 20431-3010 UC 4267 distance=119' 20501-3315 UC 4305 distance=120' 20594-3031 HDS2992 distance=122' 20556-3304 LDS6419 distance=127' 20577-3248 ENO 6 distance=129' 20598-3221 UC 4354 distance=133' 20452-3120 LDS 720BC distance=133' 20412-3015 RST2152 distance=137' 21015-3114 NSN 491 distance=139' 20447-2917 UC 4277 distance=143' 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 20507-3116 B 997 273 0.2
Show 20516-3123 KPP2645 163 24.7 14
Show 20511-3103 RST2163 231 2.1 14
Show 20517-3109 LDS5913 85 97.0 16
Show 20503-3058 LDS5911 78 118.0 18
Show 20500-3049 RST2161 271 2.6 29
Show 20485-3126 B 996 321 1.6 31
Show 20519-3047 UC 4313 233 12.5 33
Show 20479-3132 B 995 288 0.5 40
Show 20452-3120 LDS 720 AB 213 999.9 72
Show 20452-3122 WOR 40 168 4.8 72
Show 20452-3057 FAL 70 AB 76 17.5 73
Show 20452-3057 TOK 340 AC 235 539.4 73
Show 20554-3202 TDT2631 243 0.7 76
Show 20448-3112 TDT2516 60 0.6 77
Show 20562-3146 B 1001 212 0.3 77
Show 20452-3057 JSP 817 CD 75 2.2 79
Show 20454-3029 HJ 5218 190 9.8 83
Show 20561-3201 JSP 818 357 2.2 84
Show 20552-3008 HDS2980 334 0.1 90
Show 20517-2947 RST2164 318 1.0 90
Show 20440-3147 JSP 816 132 3.3 92
Show 20516-2943 DAM 668 309 11.2 94
Show 20563-3216 JSP 819 348 0.8 94
Show 20529-3245 B 1000 312 3.6 95
Show 20451-3221 LDS5910 355 283.9 97
Show 20451-3221 KPP3118 Aa,Ab 16 1.6 97
Show 20543-3243 TDT2622 Aa,Ab 232 0.5 99
Show 20543-3243 UC 4321 AB 38 24.4 99
Show 20521-2938 FIN 5 71 2.0 100
Show 20510-3256 RST2162 76 0.8 101
Show 20530-2937 B 506 317 3.2 103
Show 20467-3245 RST2160 138 0.5 103
Show 20584-3043 JSP 821 121 2.0 104
Show 20478-3255 WIS 343 9 525.5 106
Show 20517-3303 UC 4311 335 26.1 109
Show 20516-2927 TOK 863 Aa,Ab 173 1.5 110
Show 20593-3139 KPP2180 130 17.9 113
Show 20441-3000 SKF1248 55 6.4 114
Show 20434-3005 LDS5909 146 10.6 116
Show 20424-3031 H N 101 AB 334 25.9 117
Show 20431-3010 UC 4267 59 8.2 119
Show 20501-3315 UC 4305 302 143.4 120
Show 20594-3031 HDS2992 242 0.1 122
Show 20556-3304 LDS6419 34 4.7 127
Show 20577-3248 ENO 6 24 13.6 129
Show 20598-3221 UC 4354 39.8 133
Show 20452-3120 LDS 720 BC 128 1.8 133
Show 20412-3015 RST2152 335 0.9 137
Show 21015-3114 NSN 491 314 2.9 139
Show 20447-2917 UC 4277 18 16.5 143

 
 
WDS 20507-3116 : COMPONENTS
 
 
  A
B pa=274.0°
sep=0.14"
 
 
20507-3116 A
 
 
Componente originario normalizzato AB Name HD 198340 Coord arcsec 2000 205041.84-311545.4 Mag 8.66
Spectral class F8V (yellow-white) PmRA -32.00 PmDE 2.0 SAO 212486
HIP 102892 Tycho2 7457-01611-1 HD 198340 CD CD-3117886
CP CP-31 6359
Tycho2
Tycho2 7457-01611-1 Pflag RAmdeg 312.67425111 DEmdeg -31.26260556
PmRA -31.5 PmDE 4.6 E RAmdeg 7 E DEmdeg 8
E pmRA 1.3 E pmDE 1.3 EpRAm 1990.88 EpDEm 1990.35
Num 11 Q RAmdeg 0.9 Q DEmdeg 0.8 Q pmRA 0.8
Q pmDE 0.8 BTmag 8.948 E BTmag 0.018 VTmag 8.352
E VTmag 0.013 Prox 999 TYC T HIP 102892
CCDM AB RAdeg 312.67433667 DEdeg -31.26261639 EpRA 1990 1.64
EpDE 1990 1.34 E RAdeg 6.5 E DEdeg 8.0 Posflg P
Corr -0.1
SAO
SAO 212486 DelFlag RA1950 PmRA1950 -0.0036
DE1950 PmDE1950 0.008 Vmag 8.4 SpType F8
Double code Source 40 CatNum 11379 DM CD-3117886
DMcomp BDsup HD 198340 M HD 0
GC RA1950rad 5.44382837 DE1950rad -0.5489071 PmRA2000 -0.0037
PmDE2000 0.005
Hipparcos
Catalog H HIP 102892 Proxy H RAhms 20 50 41.84
DEdms -31 15 45.4 Vmag 8.3 VarFlag R Vmag G
RAdeg 312.674 DEdeg -31.2626 AstroRef * Plx 9.83
CCDM 20507-3116 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source S Qual A M HIP AB
Theta 108 Rho 0.193 HD 198340 BD
CD CD-3117886 CP CP-31 6359 Dm number -3117886 VIred 0.63
SpType F8V R SpType Coord arcsec 2000 205041.84-311545.4
Hipparcos 2
HIP 102892 Sn 55 So 3 Nc 2
RArad 5.4571967383 DErad -0.5456356349 Plx 10.9 PmRA -28.17
PmDE 7.17 E RArad 1.02 E DErad 0.64 E Plx 1.06
E pmRA 1.61 E pmDE 1.09 Hpmag 8.4046 E Hpmag 0.0013
SHp 0.012 VA 0 BV 0.556 E BV 0.015
VI 0.63
CCDM
Ccdm 20507-3116 RComp Comp A Note1
Note2 Discov num DRAs -0.27 DDEs 14.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 8.8 Sp F8 PmNote *
PmRA -46 PmDE 8 Dm number -3117886 Cat1 CD
Name2 212486 Cat2 SAO HD 198340 M HD
ADS BDS M ADS BDS N IDS IDS 20446S3138A
HIC 102892
 
 
20507-3116 B
 
 
Componente originario normalizzato AB Coord arcsec 2000 205041.83-311545.4 Mag 10.1 Calc delta mag 1.44
Calc coord yes
CCDM
Ccdm 20507-3116 RComp Comp B Note1 *
Note2 Discov num B 997 DRAs DDEs
R dRAs Year 1959 Theta 279 Rho 0.1
Obs 7 Vmag 9.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N N IDS IDS 20446S3138B
HIC 102892