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Doubles in session


Current system
20493+3217
LDS 2931 AB


Nearby doubles
13' : 20491+3230
GYL 70

20' : 20487+3159
ES 369

28' : 20471+3210
ARY 61

29' : 20491+3148
ES 370

30' : 20503+3151
TDT2570

33' : 20483+3247
TDT2550

36' : 20470+3156
GYL 71

43' : 20464+3155
TDT2532

46' : 20469+3252
ARG 93

46' : 20477+3258
COU1634

50' : 20525+3246
GYL 39

51' : 20531+3221
ES 2379

52' : 20529+3154
GYL 40

53' : 20521+3254
TDT2591

53' : 20534+3220
ES 2380

54' : 20487+3124
TDT2555

55' : 20529+3149
A 1213

57' : 20452+3240
TDT2517

57' : 20493+3314
ES 31AB

59' : 20535+3156
GYL 41

60' : 20540+3220
TDT2615

60' : 20452+3146
ARY 86

63' : 20530+3136
TDT2602

64' : 20493+3113
TDS1101

64' : 20528+3132
TDT2599

66' : 20460+3308
GYL 69



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.

20493+3217 LDS 2931 AB

 
 
20h 49m 16.23s +32° 17' 05.2" P.A. 246.00 sep 34.4 mag 8.26,16.63 Sp K2 dist. 24.05 pc (78.45 l.y.)
 
 
Coord 2000 20493+3217 Discov num LDS2931 Comp AB Coord arcsec 2000 20 49 16.23 +32 17 05.2
Date first 1953 Date last 2016 Obs 15
Pa first 246 Pa last 246.1 P.A. Now (θ) 246.1°
Sep first 35.0 Sep last 34.436 Sep. Now (ρ) 34.436"
Mag pri 8.26 Mag sec 16.63 delta mag (ΔM) 8.37 Spectral class K2 (yellow-orange)
Pri motion ra -159 Sec motion ra -158
Pri motion dec -266 Sec motion dec -278
Notes V (Proper motion indicates physical)
rPM=0.038 (< 0.3, Physical double)
This double is physical.
 
 
20493+3217 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 70545 20 49 16 +32 17 05 LDS 2931 AB 2016 15 246 34.4 8.26 16.63 8.37 <===
Show V2431 Cyg 70545 20 49 16 +32 17 05 HLA 28 AC 2016 2 125 5.3 6.00 12.90 6.90
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name V2431 Cyg Constellation Cygnus SAO 70545 HIP 102766
Tycho2 2691-00059-1 HD 198425 BD BD+31 4230 Distance 24.05
Distance ly 78.45
 
 
WDS 20493+3217 LDS 2931 AB : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
HLA2019 A - Hirsch, L.A., Ciardi, D.R., Howards, A.W., Marcy, G.W., Ruane, G., Gonzalez, E., 2019ApJ...878...50H
HLA2019 Blunt, S., Crepp, J.R., Fulton, B.J., Isaacson, H., Kosiarek, M., Mawet, D.,
HLA2019 Sinukoff, E. & Weiss, L.
HLA2019 ApJ 878, 50, 2019
HLA2021 A Hirsch, L.A., Rosenthal, L., Fulton, B.J., Howard, A.W., Ciardi, D.R., Marcy, G.W., 2021AJ....161..134H
HLA2021 Nielsen, E., Petigura, E.A., de Rosa, R.J., Isaacson, H., Weiss, L.M., Sinukoff, E.
HLA2021 & Macintosh, B.
HLA2021 AJ 161, 134 2021
LDS Luyten p.m. catalog (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
20493+3217 LDS2931 AB 2016 15 246 34.4 8.26 16.63 K2 V 204916.23+321705.2

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

 
 
WDS 20493+3217 LDS 2931 AB : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 20493+3217 LDS 2931 AB : MEASURES
 
 
No records found.

 
 
WDS 20493+3217 : VIRTUAL EYEPIECE
 
 

20493+3217 LDS2931A mag 8.26 Sp K2 20493+3217 LDS2931B sep 30.1 P.A. 242.30 mag 16.63 20493+3217 HLA 28C sep 4.8 P.A. 129.70 mag 12.9 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 20493+3217 : ALADIN DSS IMAGE @ 20h 49m 16.23s +32° 17' 05.2"
 
 
 
 
WDS 20493+3217 LDS 2931 AB : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

20493+3217 LDS2931AB distance=0' 20491+3230 GYL 70 distance=13' 20487+3159 ES 369 distance=20' 20471+3210 ARY 61 distance=28' 20491+3148 ES 370 distance=29' 20503+3151 TDT2570 distance=30' 20483+3247 TDT2550 distance=33' 20470+3156 GYL 71 distance=36' 20464+3155 TDT2532 distance=43' 20469+3252 ARG 93 distance=46' 20477+3258 COU1634 distance=46' 20525+3246 GYL 39 distance=50' 20531+3221 ES 2379 distance=51' 20529+3154 GYL 40 distance=52' 20521+3254 TDT2591 distance=53' 20534+3220 ES 2380 distance=53' 20487+3124 TDT2555 distance=54' 20529+3149 A 1213 distance=55' 20452+3240 TDT2517 distance=57' 20493+3314 ES 31AB distance=57' 20493+3314 ES 31AC distance=57' 20535+3156 GYL 41 distance=59' 20540+3220 TDT2615 distance=60' 20452+3146 ARY 86 distance=60' 20530+3136 TDT2602 distance=63' 20493+3113 TDS1101 distance=64' 20528+3132 TDT2599 distance=64' 20460+3308 GYL 69 distance=66' 20447+3146 TDT2513 distance=66' 20492+3111 LDS2930 distance=67' 20532+3301 ES 2356 distance=67' 20536+3138 HDS2976 distance=68' 20470+3318 TDT2535 distance=68' 20482+3326 ES 2377 distance=71' 20520+3320 TDT2590 distance=72' 20435+3212 KPP1637 distance=74' 20437+3243 COU1633Aa,Ab distance=75' 20437+3243 ES 2376AB distance=75' 20548+3242 STT 418 distance=75' 20528+3320 LDS2932 distance=76' 20553+3214 GYL 42 distance=77' 20487+3334 ES 9006 distance=78' 20519+3327 GYL 26AB distance=78' 20519+3327 WSI 47AC distance=78' 20515+3104 NSN 737AB distance=78' 20515+3104 RAO 676AC distance=78' 20533+3319 LDS2933 distance=80' 20503+3337 ES 2378 distance=81' 20437+3137 LDS2929 distance=81' 20540+3124 ES 371 distance=82' 20559+3206 STT 421AB distance=83' 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 20493+3217 LDS2931 AB 246 34.4
Show 20493+3217 HLA 28 AC 125 5.3
Show 20491+3230 GYL 70 188 61.2 13
Show 20487+3159 ES 369 316 7.1 20
Show 20471+3210 ARY 61 237 99.4 28
Show 20491+3148 ES 370 44 7.7 29
Show 20503+3151 TDT2570 262 3.2 30
Show 20483+3247 TDT2550 132 0.9 33
Show 20470+3156 GYL 71 46 24.4 36
Show 20464+3155 TDT2532 127 1.8 43
Show 20469+3252 ARG 93 87 10.9 46
Show 20477+3258 COU1634 61 0.4 46
Show 20525+3246 GYL 39 83 14.9 50
Show 20531+3221 ES 2379 115 7.0 51
Show 20529+3154 GYL 40 22 23.0 52
Show 20521+3254 TDT2591 5 0.5 53
Show 20534+3220 ES 2380 333 5.5 53
Show 20487+3124 TDT2555 188 0.9 54
Show 20529+3149 A 1213 178 3.3 55
Show 20452+3240 TDT2517 144 1.6 57
Show 20493+3314 ES 31 AB 238 13.8 57
Show 20493+3314 ES 31 AC 143 18.7 57
Show 20535+3156 GYL 41 203 34.2 59
Show 20540+3220 TDT2615 281 0.4 60
Show 20452+3146 ARY 86 22 78.4 60
Show 20530+3136 TDT2602 64 0.6 63
Show 20493+3113 TDS1101 231 1.2 64
Show 20528+3132 TDT2599 325 1.7 64
Show 20460+3308 GYL 69 357 26.7 66
Show 20447+3146 TDT2513 329 0.6 66
Show 20492+3111 LDS2930 273 22.2 67
Show 20532+3301 ES 2356 250 5.0 67
Show 20536+3138 HDS2976 248 0.3 68
Show 20470+3318 TDT2535 86 0.7 68
Show 20482+3326 ES 2377 220 4.3 71
Show 20520+3320 TDT2590 116 0.5 72
Show 20435+3212 KPP1637 224 12.6 74
Show 20437+3243 COU1633 Aa,Ab 239 1.9 75
Show 20437+3243 ES 2376 AB 124 7.6 75
Show 20548+3242 STT 418 283 0.9 75
Show 20528+3320 LDS2932 107 9.1 76
Show 20553+3214 GYL 42 26 15.1 77
Show 20487+3334 ES 9006 93 25.3 78
Show 20519+3327 GYL 26 AB 353 28.6 78
Show 20519+3327 WSI 47 AC 337 11.0 78
Show 20515+3104 NSN 737 AB 134 1.4 78
Show 20515+3104 RAO 676 AC 22 4.5 78
Show 20533+3319 LDS2933 146 9.0 80
Show 20503+3337 ES 2378 193 6.2 81
Show 20437+3137 LDS2929 219 2.5 81
Show 20540+3124 ES 371 134 3.5 82

 
 
WDS 20493+3217 : COMPONENTS
 
 
  A B
B pa=242.3°
sep=30.05"
 
C pa=129.7°
sep=4.80"
pa=70.3°
sep=32.20"
 
 
20493+3217 A
 
 
Coord arcsec 2000 204916.23+321705.2 Mag 8.26 Spectral class K2 (yellow-orange) PmRA -159.00
PmDE -266.0 SAO 70545 HIP 102766 Tycho2 2691-00059-1
HD 198425 BD BD+31 4230
Tycho2
Tycho2 2691-00059-1 Pflag RAmdeg 312.31763787 DEmdeg 32.28478735
PmRA -159.3 PmDE -266.4 E RAmdeg 6 E DEmdeg 5
E pmRA 1.3 E pmDE 1.2 EpRAm 1991.29 EpDEm 1991.51
Num 10 Q RAmdeg 0.7 Q DEmdeg 0.8 Q pmRA 0.6
Q pmDE 0.7 BTmag 9.457 E BTmag 0.016 VTmag 8.363
E VTmag 0.011 Prox 999 TYC T HIP 102766
CCDM RAdeg 312.31807583 DEdeg 32.28539944 EpRA 1990 1.63
EpDE 1990 1.73 E RAdeg 5.8 E DEdeg 5.2 Posflg
Corr 0.3
SAO
SAO 70545 DelFlag RA1950 PmRA1950 -0.0124
DE1950 PmDE1950 -0.285 Vmag 8.3 SpType K2
Double code Source 6 CatNum 2013 DM BD+31 4230
DMcomp BDsup HD 198425 M HD 0
GC RA1950rad 5.44210413 DE1950rad 0.56028175 PmRA2000 -0.0122
PmDE2000 -0.288
Hipparcos
Catalog H HIP 102766 Proxy RAhms 20 49 16.34
DEdms +32 17 07.6 Vmag 8.25 VarFlag R Vmag H
RAdeg 312.318 DEdeg 32.2854 AstroRef Plx 42.23
CCDM 20493+3217 N CCDM I Nsys 1 Ncomp 1
MultFlag Source Qual M HIP
Theta Rho HD 198425 BD BD+31 4230
CD CP Dm number +31 4230 VIred 0.92
SpType K2 R SpType Coord arcsec 2000 204916.34+321707.6
Hipparcos 2
HIP 102766 Sn 5 So 0 Nc 1
RArad 5.4509790822 DErad 0.5634871911 Plx 41.58 PmRA -161.13
PmDE -266.74 E RArad 0.4 E DErad 0.5 E Plx 0.83
E pmRA 0.49 E pmDE 0.56 Hpmag 8.3976 E Hpmag 0.0013
SHp 0.016 VA 0 BV 0.939 E BV 0.011
VI 0.99
CCDM
Ccdm 20493+3217 RComp Comp A Note1
Note2 Discov num DRAs -1.67 DDEs 5.6
R dRAs 10 Year Theta Rho
Obs 2 Vmag 9.0 Sp K2 PmNote *
PmRA -144 PmDE -255 Dm number +31 4230 Cat1 BD
Name2 +32 2013 Cat2 AGK2/3 HD 198425 M HD
ADS BDS M ADS BDS N IDS IDS 20452N3155A
HIC 102766
 
 
20493+3217 B
 
 
Coord arcsec 2000 204914.13+321651.2 Mag 16.63 PmRA -158.00 PmDE -278.0
Calc delta mag 8.37 Calc coord yes
CCDM
Ccdm 20493+3217 RComp Comp B Note1
Note2 Discov num LDS2931 DRAs DDEs
R dRAs Year 1953 Theta 246 Rho 35.0
Obs 1 Vmag 18.6 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS M ADS BDS N IDS IDS 20452N3155B
HIC
 
 
20493+3217 C
 
 
Coord arcsec 2000 204916.52+321702.1 Mag 12.9 Calc delta mag 4.64 Calc coord yes