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Doubles in session


Current system
18421+3445
B 2546 Aa,Ab


Nearby doubles
11' : 18430+3445
SEI 572AB

15' : 18425+3432
POP 45

16' : 18426+3459
UC 3650

20' : 18416+3503
GRV 237

20' : 18420+3505
SEI 570

24' : 18438+3433
SEI 573

31' : 18403+3425
HDS2645AB

37' : 18394+3430
SEI 568

43' : 18390+3501
POP 17

48' : 18458+3431
STF2390

49' : 18393+3517
HJ 1335

49' : 18385+3503
COU1308

51' : 18434+3533
STF2378AB

54' : 18445+3400
STTA172

55' : 18464+3500
SLE 367

56' : 18379+3505
POP 16AB

57' : 18379+3506
TRA 1

57' : 18416+3541
KPP4116

58' : 18380+3417
LDS4793

58' : 18380+3416
CRB 128

61' : 18452+3532
STF2386AB

63' : 18465+3414
COU1153

65' : 18370+3452
STF2352AB

71' : 18366+3505
COU1307

74' : 18475+3415
KPP4122

76' : 18360+3452
TDT 953



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.

18421+3445 B 2546 Aa,Ab

 
 
18h 42m 08.09s +34° 44' 46.7" P.A. 24.00 sep 0.1 mag 6.50,7.50 Sp B5V dist. 456.62 pc (1489.49 l.y.)
 
 
Coord 2000 18421+3445 Discov num B  2546 Comp Aa,Ab Coord arcsec 2000 18 42 08.09 +34 44 46.7
Date first 1958 Date last 2016 Obs 45
Pa first 254 Pa last 24.4 P.A. Now (θ) 24.4°
Sep first 0.2 Sep last 0.124 Sep. Now (ρ) 0.124"
Mag pri 6.50 Mag sec 7.50 delta mag (ΔM) 1 Spectral class B5V (blue-white)
Pri motion ra -003 Sec motion ra
Pri motion dec -001 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
18421+3445 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 67265 18 42 08 +34 44 47 B 2546 Aa,Ab 2016 45 24 0.1 6.50 7.50 1.00 Y <===
Show HD 173087 67265 18 42 08 +34 44 47 STF 2372 AB 2019 79 82 25.0 6.45 7.73 1.28
Show 67265 18 42 08 +34 44 47 BLL 34 AC 2013 9 69 114.0 6.45 11.79 5.34
Show 18 42 10 +34 44 50 BLL 34 BC 2015 16 65 91.1 7.73 11.79 4.06
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Lyra SAO 67265 HIP 91707 Tycho2 2645-02013-1
Gaia DR2 2091774627937648256 HD 173087 HR 7033 ADS 11593
BD BD+34 3285 Distance 456.62 Distance ly 1489.49
 
 
ORBITAL ELEMENTS
 
 
Period (P)111.5y Periastron (T)2030.1y Semi-major axis (a)0.133a
Eccentricity (e)0.383 Inclination (i)36.4° Longitude of periastron (ω)58°
Node (Ω)49.8° Notesn ReferenceUSN2002
Equinox2000 Last observation1996 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 335.4 0.127
2001 338.1 0.126
2002 340.8 0.125
2003 343.5 0.124
2004 346.4 0.122
2005 349.2 0.121
2006 352.1 0.120
2007 355.1 0.119
2008 358.2 0.118
2009 1.3 0.116
2010 4.4 0.115
2011 7.7 0.114
2012 11.0 0.113
2013 14.3 0.111
2014 17.8 0.110
2015 21.4 0.108
2016 25.0 0.107
2017 28.8 0.105
2018 32.7 0.103
2019 36.8 0.101
2020 41.0 0.099
2021 45.4 0.097
2022 50.1 0.094
2023 55.0 0.091
2024 60.3 0.089
2025 65.9 0.086
2026 71.9 0.082
2027 78.4 0.079
2028 85.4 0.076
2029 93.0 0.073
2030 101.1 0.071


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


 
  


wds18421%2B3445a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 18421+3445 B 2546 Aa,Ab : NOTES
 
 
discov_num notes refcode
B 2546 A is called a spectroscopic binary, but the variation is likely caused
by motion in the close visual pair.
B is BD+34@3286.
STF2372 AB: H 4 94. MEv2010
STF2372 AB: SEI 571. Nsn2017b
 
 
REFERENCES
 
 
refcode metd author reference
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Nsn2017b not - Nanson, J. ...................
Nsn2017b private communication, 2017
USN2002 orb - Seymour, D., Mason, B.D., Hartkopf, W.I., & Wycoff, G.L. 2002AJ....123.1023S
USN2002 AJ 123, 1023, 2002
 
 
DISCOVERER
 
 
idgroup discov author
1 B van den Bos, W.H.
212 BLL Ball, R.S.
219 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
18421+3445 B 2546 Aa,Ab 1996 42 147 0.1 6.50 7.50 B5V NOD 184208.09+344446.7
18421+3445 B 2546 Aa,Ab 2006 43 353 0.1 6.50 7.50 B5V NOD 184208.09+344446.7
18421+3445 B 2546 Aa,Ab 2016 44 24 0.1 6.50 7.50 B5V NO 184208.09+344446.7

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

 
 
WDS 18421+3445 B 2546 Aa,Ab : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 18421+3445 B 2546 Aa,Ab : MEASURES
 
 
No records found.

 
 
WDS 18421+3445 : VIRTUAL EYEPIECE
 
 

18421+3445 STF2372A mag 6.45 Sp B5V 18421+3445 B 2546Ab sep 0.1 P.A. 20.40 mag 7.5 18421+3445 BLL 34B sep 24.8 P.A. 82.30 mag 7.73 Sp A0 18421+3445 BLL 34C sep 96.7 P.A. 64.40 mag 11.79 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 18421+3445 : ALADIN DSS IMAGE @ 18h 42m 08.09s +34° 44' 46.7"
 
 
 
 
WDS 18421+3445 B 2546 Aa,Ab : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

18421+3445 B 2546Aa,Ab distance=0' 18421+3445 BLL 34BC distance=1' 18430+3445 SEI 572AB distance=11' 18430+3445 BKO 52AC distance=11' 18430+3445 BKO 52BD distance=11' 18425+3432 POP 45 distance=15' 18426+3459 UC 3650 distance=16' 18416+3503 GRV 237 distance=20' 18420+3505 SEI 570 distance=20' 18438+3433 SEI 573 distance=24' 18403+3425 HDS2645AB distance=31' 18403+3425 GII 270Aa,Ab distance=31' 18394+3430 SEI 568 distance=37' 18390+3501 POP 17 distance=43' 18458+3431 STF2390 distance=48' 18393+3517 HJ 1335 distance=49' 18385+3503 COU1308 distance=49' 18434+3533 STF2378BC distance=51' 18434+3533 STF2378AB distance=51' 18434+3533 SLE 688AD distance=51' 18434+3533 STF2378AC distance=51' 18434+3533 FYM 48AE distance=51' 18434+3533 FYM 48AF distance=51' 18445+3400 STTA172 distance=54' 18464+3500 SLE 367 distance=55' 18379+3505 POP 16AB distance=56' 18379+3505 POP 16AC distance=56' 18379+3505 DAM 688AD distance=56' 18379+3506 TRA 1 distance=57' 18416+3541 KPP4116 distance=57' 18380+3417 LDS4793 distance=58' 18380+3416 CRB 128 distance=58' 18452+3532 STF2386AB distance=61' 18452+3532 FOX 234AC distance=61' 18465+3414 COU1153 distance=63' 18370+3452 STF2352AB distance=65' 18370+3452 STF2352AC distance=65' 18370+3452 WAL 93AD distance=65' 18366+3505 COU1307 distance=71' 18475+3415 KPP4122 distance=74' 18360+3452 TDT 953 distance=76' 18483+3432 POP 43 distance=79' 18427+3326 UC 3651 distance=80' 18357+3452 GII 48 distance=80' 18377+3346 TDT 963 distance=81' 18414+3323 TDT 997 distance=83' 18490+3432 YSC 11 distance=86' 18352+3427 CHR 75 distance=88' 18384+3603 STF2362 distance=91' 18418+3314 KU 119 distance=92' 18462+3328 COU1152 distance=92' 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 18421+3445 B 2546 Aa,Ab 24 0.1
Show 18421+3445 STF2372 AB 82 25.0
Show 18421+3445 BLL 34 AC 69 114.0
Show 18421+3445 BLL 34 BC 65 91.1 1
Show 18430+3445 SEI 572 AB 53 22.3 11
Show 18430+3445 BKO 52 AC 147 18.7 11
Show 18430+3445 BKO 52 BD 82 7.5 11
Show 18425+3432 POP 45 275 6.8 15
Show 18426+3459 UC 3650 159 22.3 16
Show 18416+3503 GRV 237 176 57.8 20
Show 18420+3505 SEI 570 131 9.4 20
Show 18438+3433 SEI 573 298 20.9 24
Show 18403+3425 HDS2645 AB 19 1.9 31
Show 18403+3425 GII 270 Aa,Ab 109 0.2 31
Show 18394+3430 SEI 568 192 10.5 37
Show 18390+3501 POP 17 16 8.7 43
Show 18458+3431 STF2390 155 4.3 48
Show 18393+3517 HJ 1335 7 16.7 49
Show 18385+3503 COU1308 29 0.4 49
Show 18434+3533 STF2378 BC 246 203.5 51
Show 18434+3533 STF2378 AB 190 11.5 51
Show 18434+3533 SLE 688 AD 16 109.8 51
Show 18434+3533 STF2378 AC 243 210.2 51
Show 18434+3533 FYM 48 AE 270 110.9 51
Show 18434+3533 FYM 48 AF 134 66.7 51
Show 18445+3400 STTA172 5 64.9 54
Show 18464+3500 SLE 367 290 18.5 55
Show 18379+3505 POP 16 AB 310 9.2 56
Show 18379+3505 POP 16 AC 279 53.0 56
Show 18379+3505 DAM 688 AD 108 5.4 56
Show 18379+3506 TRA 1 164 9.4 57
Show 18416+3541 KPP4116 252 1.7 57
Show 18380+3417 LDS4793 182 54.2 58
Show 18380+3416 CRB 128 148 11.7 58
Show 18452+3532 STF2386 AB 18 21.1 61
Show 18452+3532 FOX 234 AC 75 56.7 61
Show 18465+3414 COU1153 116 0.4 63
Show 18370+3452 STF2352 AB 287 15.9 65
Show 18370+3452 STF2352 AC 161 210.3 65
Show 18370+3452 WAL 93 AD 204 37.9 65
Show 18366+3505 COU1307 327 1.2 71
Show 18475+3415 KPP4122 53 4.1 74
Show 18360+3452 TDT 953 136 0.4 76
Show 18483+3432 POP 43 297 2.6 79
Show 18427+3326 UC 3651 218 10.7 80
Show 18357+3452 GII 48 313 0.3 80
Show 18377+3346 TDT 963 148 1.2 81
Show 18414+3323 TDT 997 139 0.6 83
Show 18490+3432 YSC 11 55 0.4 86
Show 18352+3427 CHR 75 267 0.2 88
Show 18384+3603 STF2362 187 4.4 91

 
 
WDS 18421+3445 : COMPONENTS
 
 
  A Ab B
Ab pa=20.4°
sep=0.12"
 
B pa=82.3°
sep=24.75"
pa=82.6°
sep=24.69"
 
C pa=64.4°
sep=96.65"
pa=64.4°
sep=96.56"
pa=58.4°
sep=73.50"
 
 
18421+3445 A
 
 
Name HD 173087 Coord arcsec 2000 184208.09+344446.7 Mag 6.45 Spectral class B5V (blue-white)
PmRA 0.00 PmDE -4.0 SAO 67265 HIP 91707
Tycho2 2645-02013-1 HD 173087 HR 7033 GC 25597
BD BD+34 3285
Tycho2
Tycho2 2645-02013-1 Pflag RAmdeg 280.53369743 DEmdeg 34.74630883
PmRA 1.0 PmDE -2.3 E RAmdeg 4 E DEmdeg 4
E pmRA 1.3 E pmDE 1.4 EpRAm 1991.47 EpDEm 1991.53
Num 10 Q RAmdeg 1.0 Q DEmdeg 0.8 Q pmRA 1.1
Q pmDE 0.7 BTmag 6.316 E BTmag 0.014 VTmag 6.453
E VTmag 0.010 Prox 250 TYC T HIP 91707
CCDM A RAdeg 280.53369444 DEdeg 34.74631389 EpRA 1990 1.62
EpDE 1990 1.67 E RAdeg 3.7 E DEdeg 3.6 Posflg
Corr 0.1
SAO
SAO 67265 DelFlag RA1950 PmRA1950 0.0005
DE1950 PmDE1950 0.008 Vmag 6.1 SpType B5
Double code Source 70 CatNum 25597 DM BD+34 3285
DMcomp BDsup HD 173087 M HD 0
GC 25597 RA1950rad 4.88836714 DE1950rad 0.60557079 PmRA2000 0.0008
PmDE2000 0.008
Hipparcos
Catalog H HIP 91707 Proxy RAhms 18 42 08.09
DEdms +34 44 46.7 Vmag 6.49 VarFlag R Vmag H
RAdeg 280.534 DEdeg 34.7463 AstroRef A Plx 2.47
CCDM 18422+3445 N CCDM I Nsys 2 Ncomp 1
MultFlag C Source P Qual A M HIP
Theta Rho HD 173087 BD BD+34 3285
CD CP Dm number +34 3285 VIred -0.13
SpType B5V R SpType Coord arcsec 2000 184208.09+344446.7
Hipparcos 2
HIP 91707 Sn 95 So 3 Nc 1
RArad 4.8962366648 DErad 0.6064376081 Plx 2.19 PmRA 0.08
PmDE -4.2 E RArad 0.43 E DErad 0.52 E Plx 0.61
E pmRA 0.49 E pmDE 0.67 Hpmag 6.4518 E Hpmag 0.0089
SHp 0.022 VA 0 BV -0.116 E BV 0.005
VI -0.1
 
 
18421+3445 Ab
 
 
Coord arcsec 2000 184208.09+344446.8 Mag 7.5 Calc delta mag 1 Calc coord yes
 
 
18421+3445 B
 
 
Coord arcsec 2000 184210.08+344450.0 Coord calc 184210.08+344450.0 Mag 7.73 Spectral class A0 (white)
PmRA 1.00 PmDE -3.0 HIP 91712 Tycho2 2645-02012-1
BD BD+34 3286 Calc delta mag 1.23
Tycho2
Tycho2 2645-02012-1 Pflag RAmdeg 280.54206663 DEmdeg 34.74725057
PmRA 0.9 PmDE 0.4 E RAmdeg 5 E DEmdeg 5
E pmRA 2.1 E pmDE 2.2 EpRAm 1991.56 EpDEm 1991.55
Num 4 Q RAmdeg 0.8 Q DEmdeg 0.8 Q pmRA 0.9
Q pmDE 0.9 BTmag 7.644 E BTmag 0.015 VTmag 7.729
E VTmag 0.011 Prox 250 TYC T HIP 91712
CCDM B RAdeg 280.54206417 DEdeg 34.74724972 EpRA 1990 1.62
EpDE 1990 1.61 E RAdeg 5.0 E DEdeg 4.7 Posflg
Corr 0.1
Hipparcos
Catalog H HIP 91712 Proxy RAhms 18 42 10.10
DEdms +34 44 50.1 Vmag 8.19 VarFlag R Vmag H
RAdeg 280.542 DEdeg 34.7472 AstroRef B Plx 8.76
CCDM 18422+3445 N CCDM I Nsys 2 Ncomp 1
MultFlag C Source I Qual A M HIP
Theta Rho HD BD BD+34 3286
CD CP Dm number +34 3286 VIred -0.02
SpType B8.5V R SpType Coord arcsec 2000 184210.10+344450.1
Hipparcos 2
HIP 91712 Sn 95 So 3 Nc 1
RArad 4.896382973 DErad 0.606453751 Plx 2.83 PmRA -1.59
PmDE -13.69 E RArad 3.19 E DErad 3 E Plx 3.94
E pmRA 3.74 E pmDE 4.01 Hpmag 8.081 E Hpmag 0.0299
SHp 0 VA 0 BV -0.043 E BV 0.008
VI -0.02
 
 
18421+3445 C
 
 
Coord arcsec 2000 184215.16+344528.5 Mag 11.79 PmRA 1.00 PmDE -2.0
Tycho2 2645-01165-1 Calc delta mag 5.29 Calc coord yes
Tycho2
Tycho2 2645-01165-1 Pflag RAmdeg 280.56998017 DEmdeg 34.75804121
PmRA 3.3 PmDE -2.9 E RAmdeg 124 E DEmdeg 116
E pmRA 3.4 E pmDE 3.1 EpRAm 1961.33 EpDEm 1966.56
Num 4 Q RAmdeg 0.7 Q DEmdeg 1.7 Q pmRA 0.7
Q pmDE 1.7 BTmag 12.423 E BTmag 0.213 VTmag 11.792
E VTmag 0.177 Prox 913 TYC HIP
CCDM RAdeg 280.56998889 DEdeg 34.75806611 EpRA 1990 1.47
EpDE 1990 1.59 E RAdeg 168.8 E DEdeg 144.4 Posflg
Corr 0.2