Coord 2000 | 18443+3940 |
Discov num | STF2382 |
Comp | AB |
Coord arcsec 2000 | 18 44 20.34 +39 40 12.4 |
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Date first | 1777 |
Date last | 2017 |
Obs | 620 |
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Pa first | 45 |
Pa last | 346 |
P.A. Now (θ) | 344.8° |
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Sep first | 4.0 |
Sep last | 2.2 |
Sep. Now (ρ) | 2.31" |
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Mag pri | 5.15 |
Mag sec | 6.10 |
delta mag (ΔM) | 0.95 |
Spectral class | A4V+F1V (white/yellow-white) |
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Pri motion ra | +011 |
Sec motion ra | +002 |
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Pri motion dec | +061 |
Sec motion dec | +047 |
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Notes |
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 | 2017 | 620 | 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 | 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 | 225 | 0.1 | 5.25 | |||||
Show | 67315 | 18443+3940 | STF2383 | CD | 1777 | 2017 | 626 | 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 | 11 | 37 | 45.6 | 12.30 | 12.70 | 0.40 | |||
Show | 67315 | 18443+3940 | SHJ 277 | EG | 1878 | 2015 | 7 | 236 | 50.0 | 12.30 | 14.20 | 1.90 | |||
Show | 67315 | 18443+3940 | STFA 37 | EI | 2000 | 2015 | 4 | 68 | 108.9 | 12.30 | 10.12 | 2.18 | |||
Show | 67315 | 18443+3940 | SHJ 277 | GH | 1878 | 2015 | 9 | 358 | 35.8 | 14.20 | 13.90 | 0.30 |
Precise pa | 345.7 |
Precise sep | 2.18 |
Name | Eps1 Lyr |
Constellation | Lyra |
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SAO | 67310 |
HIP | 91919 |
Tycho2 | 3122-03438-2 |
Gaia DR2 | 2098237660363229312 |
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HD | 173582 |
HR | 7051 |
GC | 25667 |
ADS | 11635 |
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BD | BD+39 3509 |
Bayer | Epsilon 1 Lyrae |
Bayer name | Eps1 Lyr |
Flamsteed | 4 Lyrae |
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Flamsteed name | 4 Lyr |
Distance | 49.78 |
Distance ly | 162.38 |
last precise pa | 345.7 |
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last precise sep | 2.18 |
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 | Grade | 4 | (1=Definitive, 9=Indet.) | |||
Equinox | 2000 | Last observation | 2003 |
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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![]() Measures: green=micrometric, blue=interferometric, purple=photographic |
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 | Grade | 4 | (1=Definitive, 9=Indet.) | ||
Equinox | 2000 | Last observation | 2003 |
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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![]() Measures: green=micrometric, blue=interferometric, purple=photographic |
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 | 593 | 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 |