18550+3053 A   258

 
 
18h 54m 59.91s +30 52' 45.5" P.A. 238.2 sep 0.32 mag 8.86,9.88 Sp G0
 
 
Coord 2000
18550+3053
Discov num
A   258
Comp
Coord arcsec 2000
18 54 59.91 +30 52 45.5
Date first
1901
Date last
2007
Obs
28
Pa first
268
Pa last
242
P.A. Now (θ)
238.2°
Sep first
0.3
Sep last
0.4
Sep. Now (ρ)
0.32"
Mag pri
8.86
Mag sec
9.88
delta mag (ΔM)
1.02
Spectral class
G0 (yellow)
Pri motion ra
+009
Sec motion ra
+009
Pri motion dec
-014
Sec motion dec
-014
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
241.8
Precise sep
0.415
Constellation
Lyra
Tycho2
2639-00389-1
HD
175612
ADS
11837
last precise pa
241.8
last precise sep
0.415
 
 
ORBITAL ELEMENTS
 
 
Period (P)1353y Periastron (T)2007y Semi-major axis (a)1.52a
Eccentricity (e)0.67 Inclination (i)97° Longitude of periastron (ω)32°
Node (Ω)247° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2007
label rho theta
2000 0.478 244.5
2001 0.472 244.3
2002 0.465 244.0
2003 0.458 243.8
2004 0.450 243.5
2005 0.443 243.2
2006 0.435 242.9
2007 0.427 242.6
2008 0.418 242.3
2009 0.410 242.0
2010 0.401 241.7
2011 0.392 241.3
2012 0.382 240.9
2013 0.373 240.6
2014 0.363 240.1
2015 0.353 239.7
2016 0.343 239.3
2017 0.333 238.8
2018 0.322 238.2
2019 0.312 237.7
2020 0.301 237.1
2021 0.290 236.5
2022 0.279 235.8
2023 0.268 235.0
2024 0.257 234.2
2025 0.246 233.4
2026 0.235 232.4
2027 0.223 231.3
2028 0.212 230.2
2029 0.201 228.8
2030 0.189 227.4

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

grafico orbita





wds18550%2B3053a.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
18550+3053 A 258 1995 25 242 0.5 8.86 9.88 G0 185459.91+305245.5
18550+3053 A 258 2005 26 244 0.4 8.86 9.88 G0 185459.91+305245.5
18550+3053 A 258 2007 28 242 0.4 8.86 9.88 G0 185459.91+305245.5

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