18443+3940 STF 2382 AB

 
 
18h 44m 20.34s +39 40' 12.4" P.A. 345.00 sep 2.2 mag 5.15,6.10 Sp A4V+F1V dist. 49.78 pc (162.38 l.y.)
 
 
Coord 2000 18443+3940 Discov num STF2382 Comp AB Coord arcsec 2000 18 44 20.34 +39 40 12.4
Date first 1777 Date last 2021 Obs 641
Pa first 45 Pa last 344.7 P.A. Now (θ) 344.7°
Sep first 4.0 Sep last 2.15 Sep. Now (ρ) 2.15"
Mag pri 5.15 Mag sec 6.10 delta mag (ΔM) 0.95 Spectral class A4V+F1V (white/yellow-white)
Pri motion ra +011 Sec motion ra +002
Pri motion dec +061 Sec motion dec +047
Notes N O (See Notes, Orbital solution)
rPM=0.269 (< 0.3, Physical double)
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
 
 
Constellation Lyra SAO 67310 HIP 91919 Tycho2 3122-03438-2
Gaia DR2 2098237660363229312 HD 173582 HR 7051 GC 25667
ADS 11635 BD BD+39 3509 Bayer Epsilon 1 Lyrae Bayer name Eps1 Lyr
Flamsteed 4 Lyrae Flamsteed name 4 Lyr Distance 49.78 Distance ly 162.38
Bayer greek ε1 Lyr
 
 
ORBITAL ELEMENTS SOLUTION #1
 
 
Period (P)1725y Periastron (T)190y Semi-major axis (a)4.17a
Eccentricity (e)0.243 Inclination (i)118.6° Longitude of periastron (ω)198°
Node (Ω)198° Notesn ReferenceWSI2004b
Equinox2000 Last observation2003 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 350.4 2.468
2001 350.1 2.460
2002 349.9 2.452
2003 349.6 2.444
2004 349.3 2.436
2005 349.0 2.428
2006 348.7 2.419
2007 348.4 2.411
2008 348.1 2.403
2009 347.8 2.395
2010 347.5 2.387
2011 347.2 2.378
2012 347.0 2.370
2013 346.7 2.362
2014 346.3 2.354
2015 346.0 2.346
2016 345.7 2.337
2017 345.4 2.329
2018 345.1 2.321
2019 344.8 2.313
2020 344.5 2.305
2021 344.2 2.296
2022 343.8 2.288
2023 343.5 2.280
2024 343.2 2.272
2025 342.9 2.264
2026 342.5 2.256
2027 342.2 2.248
2028 341.9 2.240
2029 341.5 2.231
2030 341.2 2.223


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



 
 


wds18443%2B3940a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
ORBITAL ELEMENTS SOLUTION #2
 
 
Period (P)2802.8y Periastron (T)2051.49y Semi-major axis (a)14.237a
Eccentricity (e)0.953 Inclination (i)102.2° Longitude of periastron (ω)258.8°
Node (Ω)149.6° Notesn ReferenceDoc2020e
Equinox2000 Last observation2020 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 350.3 2.484
2001 350.0 2.472
2002 349.7 2.460
2003 349.5 2.448
2004 349.2 2.436
2005 348.9 2.423
2006 348.6 2.410
2007 348.3 2.396
2008 348.0 2.382
2009 347.7 2.368
2010 347.4 2.353
2011 347.1 2.338
2012 346.8 2.323
2013 346.5 2.307
2014 346.2 2.290
2015 345.9 2.273
2016 345.6 2.255
2017 345.2 2.237
2018 344.9 2.218
2019 344.5 2.198
2020 344.2 2.178
2021 343.8 2.157
2022 343.5 2.135
2023 343.1 2.112
2024 342.7 2.088
2025 342.3 2.064
2026 341.9 2.038
2027 341.5 2.011
2028 341.1 1.983
2029 340.7 1.953
2030 340.3 1.922


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



 
 


wds18443%2B3940g.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic