18178+4351 A 578 Aa,Ab

 
 
18h 17m 49.51s +43° 50' 32.0" P.A. 244.00 sep 0.3 mag 9.55,10.64 Sp F8 dist. 129.03 pc (420.9 l.y.)
 
 
Coord 2000 18178+4351 Discov num A   578 Comp Aa,Ab Coord arcsec 2000 18 17 49.51 +43 50 32.0
Date first 1903 Date last 2014 Obs 42
Pa first 28 Pa last 243.7 P.A. Now (θ) 243.7°
Sep first 0.2 Sep last 0.33 Sep. Now (ρ) 0.33"
Mag pri 9.55 Mag sec 10.64 delta mag (ΔM) 1.09 Spectral class F8 (yellow-white)
Pri motion ra -019 Sec motion ra
Pri motion dec -010 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
18178+4351 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 18 17 50 +43 50 32 A 578 Aa,Ab 2014 42 244 0.3 9.55 10.64 1.09 Y <===
Show 18 17 50 +43 50 32 A 578 AB 2014 26 167 1.8 9.13 12.24 3.11
Triple system
2 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Lyra HIP 89655 Tycho2 3115-00363-1 Gaia DR2 2114710062530870912
ADS 11247 BD BD+43 2938 Distance 129.03 Distance ly 420.9
 
 
ORBITAL ELEMENTS
 
 
Period (P)143.769y Periastron (T)2032.26y Semi-major axis (a)0.2859a
Eccentricity (e)0.6032 Inclination (i)121.1° Longitude of periastron (ω)262.7°
Node (Ω)27° Notes ReferenceOle2001
Equinox Last observation1997 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 249.6 0.235
2001 248.0 0.235
2002 246.5 0.235
2003 245.0 0.234
2004 243.4 0.234
2005 241.9 0.234
2006 240.3 0.233
2007 238.8 0.232
2008 237.2 0.232
2009 235.6 0.230
2010 234.0 0.229
2011 232.4 0.228
2012 230.8 0.226
2013 229.1 0.223
2014 227.4 0.221
2015 225.6 0.218
2016 223.8 0.215
2017 222.0 0.211
2018 220.0 0.206
2019 218.0 0.201
2020 215.9 0.196
2021 213.6 0.189
2022 211.2 0.182
2023 208.5 0.174
2024 205.5 0.164
2025 202.2 0.154
2026 198.3 0.142
2027 193.7 0.129
2028 188.1 0.115
2029 180.7 0.100
2030 170.7 0.085


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



 
 


wds18178%2B4351a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic