18178+4351 A   578Aa,Ab

 
 
18H 17M 49.51S +43 50' 32.0" P.A. 220 SEP 0.21 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
2010
Obs
30
Pa first
28
Pa last
246
P.A. Now (θ)
220°
Sep first
0.2
Sep last
0.3
Sep. Now (ρ)
0.21"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 47365 18178+4351 A 578 Aa,Ab 1903 2010 30 220 0.2 9.55 10.64 1.09 Y <===
Show 47365 18178+4351 A 578 AB 1903 2010 16 167 1.8 9.13 12.24 3.11
Triple system
2 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Lyra
SAO
47365
HIP
89655
Tycho2
3115-00363-1
ADS
11247
BD
BD+43 2938
Distance
129.03
Distance ly
420.9
last precise pa
245.5
last precise sep
0.31
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation1997
label rho theta
2000 0.235 249.6
2001 0.235 248.0
2002 0.235 246.5
2003 0.234 245.0
2004 0.234 243.4
2005 0.234 241.9
2006 0.233 240.3
2007 0.232 238.8
2008 0.232 237.2
2009 0.230 235.6
2010 0.229 234.0
2011 0.228 232.4
2012 0.226 230.8
2013 0.223 229.1
2014 0.221 227.4
2015 0.218 225.6
2016 0.215 223.8
2017 0.211 222.0
2018 0.206 220.0
2019 0.201 218.0
2020 0.196 215.9
2021 0.189 213.6
2022 0.182 211.2
2023 0.174 208.5
2024 0.164 205.5
2025 0.154 202.2
2026 0.142 198.3
2027 0.129 193.7
2028 0.115 188.1
2029 0.100 180.7
2030 0.085 170.7

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