18121+4644 COU2118

 
 
18h 12m 05.16s +46 44' 11.9" P.A. 124 sep 0.11 mag 11.07,8.71 Sp G5 dist. 98.62 pc (321.7 l.y.)
 
 
Coord 2000
18121+4644
Discov num
COU2118
Comp
Coord arcsec 2000
18 12 05.16 +46 44 11.9
Date first
1982
Date last
1996
Obs
11
Pa first
42
Pa last
23
P.A. Now (θ)
124°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.11"
Mag pri
11.07
Mag sec
8.71
delta mag (ΔM)
2.36
Spectral class
G5 (yellow)
Pri motion ra
-057
Sec motion ra
Pri motion dec
-058
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
22.5
Precise sep
0.135
Constellation
Hercules
SAO
47298
HIP
89186
Tycho2
3525-02233-1
HD
167260
BD
BD+46 2441
Distance
98.62
Distance ly
321.7
last precise pa
22.5
last precise sep
0.135
 
 
ORBITAL ELEMENTS
 
 
Period (P)25.2y Periastron (T)1994.61y Semi-major axis (a)0.143a
Eccentricity (e)0.55 Inclination (i)37.5° Longitude of periastron (ω)73°
Node (Ω)150° Note Grade5(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.158 354.3
2001 0.168 1.5
2002 0.175 8.1
2003 0.179 14.3
2004 0.182 20.2
2005 0.183 26.0
2006 0.182 31.8
2007 0.181 37.7
2008 0.178 43.7
2009 0.174 49.9
2010 0.170 56.5
2011 0.164 63.4
2012 0.158 70.9
2013 0.151 79.0
2014 0.143 87.9
2015 0.134 98.0
2016 0.123 109.8
2017 0.110 124.0
2018 0.092 143.0
2019 0.068 173.4
2020 0.052 232.6
2021 0.071 290.5
2022 0.100 317.7
2023 0.124 333.2
2024 0.142 344.0
2025 0.156 352.7
2026 0.166 0.1
2027 0.174 6.8
2028 0.178 13.1
2029 0.181 19.0
2030 0.183 24.9

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

grafico orbita





wds18121%2B4644a.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
18121+4644 COU2118 1996 11 23 0.1 11.07 8.71 G5 O 181205.16+464411.9

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