18443+3940 STF2382AB (Eps1 Lyr)

 
 
18h 44m 20.34s +39 40' 12.4" P.A. 344.20 sep 2.3 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
2020
Obs
639
Pa first
45
Pa last
345
P.A. Now (θ)
344.2°
Sep first
4.0
Sep last
2.2
Sep. Now (ρ)
2.3"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Eps1 Lyr 67310 18443+3940 STF2382 AB 1777 2020 639 344 2.3 5.15 6.10 0.95 Y <===
Show Double Double 67310 18443+3940 STFA 37 AB,CD 1830 2016 97 172 209.5 4.67 4.56 0.11
Show 67310 18443+3940 STFA 37 AD 1903 2017 18 172 210.5 5.15 5.38 0.23
Show 67310 18443+3940 STFA 37 AI 1863 2015 23 137 149.5 5.15 10.12 4.97
Show 67310 18443+3940 STFA 37 BC 1903 2011 14 172 210.9 6.10 5.25 0.85
Show 67310 18443+3940 STFA 37 BD 1903 2000 11 172 209.6 6.10 5.38 0.72
Show 67310 18443+3940 STFA 37 BI 1872 2015 10 137 151.3 6.10 10.12 4.02
Show 67315 18443+3940 CHR 77 Ca,Cb 1985 2005 5 43 0.2 5.25 Y
Show 67315 18443+3940 STF2383 CD 1777 2020 636 74 2.4 5.25 5.38 0.13 Y
Show 67315 18443+3940 SHJ 277 CD,F 2002 2015 3 0 93.3 4.56 12.70 8.14
Show 67315 18443+3940 SHJ 277 CD,G 2000 2015 4 293 75.1 4.56 14.20 9.64
Show 67315 18443+3940 SHJ 277 CD,H 2000 2015 4 313 95.7 4.56 13.90 9.34
Show 67315 18443+3940 STF2383 CE 2000 2015 8 334 63.2 5.25 12.30 7.05
Show 67315 18443+3940 STFA 37 CI 1863 2012 18 37 120.4 5.25 10.12 4.87
Show 67315 18443+3940 STFA 37 DI 1909 2000 6 37 121.6 5.38 10.12 4.74
Show 67315 18443+3940 SHJ 277 EF 1831 2015 15 37 45.6 12.30 12.70 0.40
Show 67315 18443+3940 SHJ 277 EG 1878 2015 11 236 50.0 12.30 14.20 1.90
Show 67315 18443+3940 STFA 37 EI 2000 2015 7 68 108.9 12.30 10.12 2.18
Show 67315 18443+3940 SHJ 277 GH 1878 2015 13 358 35.8 14.20 13.90 0.30
11-fold system
11 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
345.1
Precise sep
2.19
Name
Eps1 Lyr
Constellation
Lyra
SAO
67310
HIP
91919
Tycho2
3122-03438-2
Gaia DR2
60363229312
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
last precise pa
345.1
last precise sep
2.19
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2003
label rho theta
2000 2.468 350.4
2001 2.460 350.1
2002 2.452 349.9
2003 2.444 349.6
2004 2.436 349.3
2005 2.428 349.0
2006 2.419 348.7
2007 2.411 348.4
2008 2.403 348.1
2009 2.395 347.8
2010 2.387 347.5
2011 2.378 347.2
2012 2.370 347.0
2013 2.362 346.7
2014 2.354 346.3
2015 2.346 346.0
2016 2.337 345.7
2017 2.329 345.4
2018 2.321 345.1
2019 2.313 344.8
2020 2.305 344.5
2021 2.296 344.2
2022 2.288 343.8
2023 2.280 343.5
2024 2.272 343.2
2025 2.264 342.9
2026 2.256 342.5
2027 2.248 342.2
2028 2.240 341.9
2029 2.231 341.5
2030 2.223 341.2

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






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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2020
label rho theta
2000 2.484 350.3
2001 2.472 350.0
2002 2.460 349.7
2003 2.448 349.5
2004 2.436 349.2
2005 2.423 348.9
2006 2.410 348.6
2007 2.396 348.3
2008 2.382 348.0
2009 2.368 347.7
2010 2.353 347.4
2011 2.338 347.1
2012 2.323 346.8
2013 2.307 346.5
2014 2.290 346.2
2015 2.273 345.9
2016 2.255 345.6
2017 2.237 345.2
2018 2.218 344.9
2019 2.198 344.5
2020 2.178 344.2
2021 2.157 343.8
2022 2.135 343.5
2023 2.112 343.1
2024 2.088 342.7
2025 2.064 342.3
2026 2.038 341.9
2027 2.011 341.5
2028 1.983 341.1
2029 1.953 340.7
2030 1.922 340.3

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






wds18443%2B3940g.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18443+3940 STF2382 AB 2007 558 349 2.3 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2008 563 348 2.3 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2009 566 348 2.4 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2010 581 347 2.3 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2011 588 349 2.4 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2012 590 347 2.2 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2013 599 346 2.3 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2014 588 346 2.2 5.15 6.10 A4V F1V NOD 184420.34+394012.4
18443+3940 STF2382 AB 2015 600 346 2.4 5.15 6.10 A4V+F1V NO 184420.34+394012.4
18443+3940 STF2382 AB 2016 615 346 2.3 5.15 6.10 A4V+F1V NO 184420.34+394012.4
18443+3940 STF2382 AB 2017 619 346 2.3 5.15 6.10 A4V+F1V NO 184420.34+394012.4
18443+3940 STF2382 AB 2018 621 346 2.2 5.15 6.10 A4V+F1V NO 184420.34+394012.4
18443+3940 STF2382 AB 2019 628 345 2.2 5.15 6.10 A4V+F1V NO 184420.34+394012.4

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