18443+3940 STF2382AB (Eps1 Lyr)

 
 
18H 44M 20.34S +39 40' 12.4" P.A. 345.4 SEP 2.33 MAG 5.15,6.1 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
2016
Obs
615
Pa first
45
Pa last
346
P.A. Now (θ)
345.4°
Sep first
4
Sep last
2.3
Sep. Now (ρ)
2.33"
Mag pri
5.15
Mag sec
6.1
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 2016 615 345 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 2013 17 172 208.6 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 5 225 0.1 5.25
Show 67315 18443+3940 STF2383 CD 1777 2016 621 75 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 18443+3940 SHJ 277 EF 1831 2015 10 37 45.6 12.30 12.70 0.40
Show 18443+3940 SHJ 277 EG 1878 2015 6 236 50.0 12.30 14.20 1.90
Show 18443+3940 STFA 37 EI 2000 2011 3 68 108.9 12.30 10.12 2.18
Show 18443+3940 SHJ 277 GH 1878 2015 8 358 35.8 14.20 13.90 0.30
11-fold system
11 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
Eps1 Lyr
Constellation
Lyra
SAO
67310
HIP
91919
Tycho2
3122-03438-2
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
345.9
last precise sep
2.297
 
 
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





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
ORBITAL ELEMENTS SOLUTION #2
 
 
Period (P)1804.41y± 11.56 Periastron (T)2091.43y± 10.25 Semi-major axis (a)4.742a± 0.27
Eccentricity (e)0.691± 0.007 Inclination (i)121.2°± 0.18 Longitude of periastron (ω)255.5°± 0.52
Node (Ω)162.1°± 0.23 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2003
label rho theta
2000 2.452 350.5
2001 2.441 350.3
2002 2.430 350.0
2003 2.419 349.7
2004 2.407 349.4
2005 2.396 349.1
2006 2.384 348.8
2007 2.372 348.5
2008 2.360 348.2
2009 2.348 347.9
2010 2.336 347.6
2011 2.323 347.3
2012 2.311 347.0
2013 2.298 346.7
2014 2.285 346.3
2015 2.272 346.0
2016 2.259 345.7
2017 2.245 345.4
2018 2.232 345.0
2019 2.218 344.7
2020 2.204 344.3
2021 2.190 344.0
2022 2.175 343.6
2023 2.161 343.3
2024 2.146 342.9
2025 2.131 342.6
2026 2.116 342.2
2027 2.101 341.8
2028 2.085 341.4
2029 2.069 341.0
2030 2.053 340.6

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic