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Doubles in session


Current system
18443+3940
STF 2383 CD


Nearby doubles
16' : 18457+3942
BU 51AB

21' : 18426+3937
HJ 1341

23' : 18433+3918
BLL 35

25' : 18452+3914
STF2392AB

31' : 18453+4005
ROE 50AB

32' : 18465+3958
LDS4799

38' : 18418+4001
LSC 83

43' : 18453+3856
COU1608

44' : 18478+3954
GRV 240

44' : 18436+4020
SLE 122

44' : 18481+3929
COU1609

50' : 18483+3956
SLW1221

52' : 18466+3853
ES 2021AB

58' : 18480+3858
ES 2572

58' : 18397+3955
TDT 981

59' : 18490+3914
COU1610

62' : 18483+4018
UC 3676

69' : 18404+4028
SLE 92

70' : 18466+4042
HDS2663

72' : 18501+4002
HU 1192

73' : 18381+3935
BU 50AB

74' : 18496+4020
UC 3687

75' : 18507+3920
HDS2672

76' : 18450+4051
COU1792

76' : 18432+3822
HDS2651

79' : 18452+3819
STF2393AB



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.

18443+3940 STF 2383 CD

 
 
18h 44m 22.78s +39° 36' 45.8" P.A. 75.00 sep 2.3 mag 5.25,5.38 Sp A8Vn+F0Vn dist. 47.69 pc (155.56 l.y.)
 
 
Coord 2000 18443+3940 Discov num STF2383 Comp CD Coord arcsec 2000 18 44 22.78 +39 36 45.8
Date first 1777 Date last 2021 Obs 641
Pa first 180 Pa last 74.6 P.A. Now (θ) 74.6°
Sep first 2.0 Sep last 2.34 Sep. Now (ρ) 2.34"
Mag pri 5.25 Mag sec 5.38 delta mag (ΔM) 0.13 Spectral class A8Vn+F0Vn (white/yellow-white)
Pri motion ra +008 Sec motion ra +008
Pri motion dec +054 Sec motion dec +054
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
18443+3940 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 67310 18 44 20 +39 40 12 STF 2382 AB 2021 641 345 2.2 5.15 6.10 0.95 Y
Show Double Double 67310 18 44 20 +39 40 12 STFA 37 AB,CD 2021 98 172 209.4 4.67 4.56 0.11
Show 67310 18 44 20 +39 40 12 STFA 37 AD 2021 19 172 208.2 5.15 5.38 0.23
Show 67310 18 44 20 +39 40 12 STFA 37 AI 2021 24 137 150.4 5.15 10.12 4.97
Show 67315 18 44 20 +39 40 14 STFA 37 BC 2011 14 172 210.9 6.10 5.25 0.85
Show 67315 18 44 20 +39 40 14 STFA 37 BD 2021 12 171 212.5 6.10 5.38 0.72
Show 18 44 20 +39 40 14 STFA 37 BI 2015 10 137 151.3 6.10 10.12 4.02
Show 67315 18 44 23 +39 36 46 CHR 77 Ca,Cb 2005 5 225 0.1 5.25 Y
Show 67315 18 44 23 +39 36 46 STF 2383 CD 2021 641 75 2.3 5.25 5.38 0.13 Y <===
Show 67315 18 44 23 +39 36 46 SHJ 277 CD,F 2015 3 0 93.3 4.56 12.70 8.14
Show 67315 18 44 23 +39 36 46 SHJ 277 CD,G 2015 4 293 75.1 4.56 14.20 9.64
Show 67315 18 44 23 +39 36 46 SHJ 277 CD,H 2015 4 313 95.7 4.56 13.90 9.34
Show 67310 18 44 23 +39 36 46 STF 2383 CE 2015 8 334 63.2 5.25 12.30 7.05
Show 18 44 23 +39 36 46 STFA 37 CI 2012 18 37 120.4 5.25 10.12 4.87
Show 67315 18 44 23 +39 36 46 STFA 37 DI 2000 6 37 121.6 5.38 10.12 4.74
Show 67310 18 44 20 +39 37 43 SHJ 277 EF 2021 16 37 45.4 12.30 12.70 0.40
Show 67310 18 44 20 +39 37 43 SHJ 277 EG 2015 11 236 50.0 12.30 14.20 1.90
Show 18 44 20 +39 37 43 STFA 37 EI 2015 7 68 108.9 12.30 10.12 2.18
Show 18 44 17 +39 37 16 SHJ 277 GH 2015 13 358 35.8 14.20 13.90 0.30
11-fold system
11 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name NSV11301 Lyr Constellation Lyra SAO 67315 HIP 91926
Tycho2 3122-03439-1 Gaia DR2 2098202128093842432 HD 173607 HR 7054
GC 25668 ADS 11635 BD BD+39 3510 Bayer Epsilon 2 Lyrae
Bayer name Eps2 Lyr Flamsteed 5 Lyrae Flamsteed name 5 Lyr Distance 47.69
Distance ly 155.56 Bayer greek ε2 Lyr
 
 
ORBITAL ELEMENTS
 
 
Period (P)724.3y Periastron (T)2223.9y Semi-major axis (a)2.92a
Eccentricity (e)0.353 Inclination (i)126.1° Longitude of periastron (ω)73.8°
Node (Ω)26.5° Notesn ReferenceDoc2020e
Equinox2000 Last observation2020 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 82.6 2.339
2001 82.2 2.342
2002 81.8 2.345
2003 81.4 2.348
2004 80.9 2.351
2005 80.5 2.353
2006 80.1 2.356
2007 79.7 2.359
2008 79.3 2.362
2009 78.8 2.365
2010 78.4 2.368
2011 78.0 2.371
2012 77.6 2.374
2013 77.2 2.377
2014 76.8 2.380
2015 76.4 2.383
2016 75.9 2.387
2017 75.5 2.390
2018 75.1 2.393
2019 74.7 2.396
2020 74.3 2.399
2021 73.9 2.402
2022 73.5 2.405
2023 73.1 2.408
2024 72.7 2.412
2025 72.3 2.415
2026 71.9 2.418
2027 71.5 2.421
2028 71.1 2.424
2029 70.7 2.427
2030 70.3 2.431


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


 
  


wds18443%2B3940h.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic