18121+4644 COU 2118 (HD 167260)

 
 
18h 12m 05.16s +46° 44' 11.9" P.A. 274.00 sep 0.1 mag 8.71,11.07 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 2014 Obs 12
Pa first 42 Pa last 274 P.A. Now (θ) 274°
Sep first 0.2 Sep last 0.129 Sep. Now (ρ) 0.129"
Mag pri 8.71 Mag sec 11.07 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
 
 
Name HD 167260 Constellation Hercules SAO 47298 HIP 89186
Tycho2 3525-02233-1 Gaia DR2 2122323905675529728 HD 167260 BD BD+46 2441
Distance 98.62 Distance ly 321.7
 
 
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° Notes ReferenceCou1999b
Equinox Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 354.3 0.158
2001 1.5 0.168
2002 8.1 0.175
2003 14.3 0.179
2004 20.2 0.182
2005 26.0 0.183
2006 31.8 0.182
2007 37.7 0.181
2008 43.7 0.178
2009 49.9 0.174
2010 56.5 0.170
2011 63.4 0.164
2012 70.9 0.158
2013 79.0 0.151
2014 87.9 0.143
2015 98.0 0.134
2016 109.8 0.123
2017 124.0 0.110
2018 143.0 0.092
2019 173.4 0.068
2020 232.6 0.052
2021 290.5 0.071
2022 317.7 0.100
2023 333.2 0.124
2024 344.0 0.142
2025 352.7 0.156
2026 0.1 0.166
2027 6.8 0.174
2028 13.1 0.178
2029 19.0 0.181
2030 24.9 0.183
2031 30.6 0.183
2032 36.5 0.181
2033 42.5 0.179
2034 48.7 0.175
2035 55.1 0.171
2036 62.0 0.165
2037 69.3 0.159
2038 77.3 0.152
2039 86.1 0.145
2040 95.9 0.136
2041 107.3 0.125
2042 120.9 0.113
2043 138.7 0.096
2044 165.7 0.074
2045 218.2 0.052
2046 282.0 0.065
2047 313.6 0.094
2048 330.6 0.120
2049 342.1 0.139
2050 351.1 0.154


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds18121%2B4644a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic