20057-3743 HDS 2865 (HD 190289)

 
 
20h 05m 41.20s -37 42' 53.2" P.A. 185.00 sep 0.1 mag 8.53,9.11 Sp F3V dist. 149.03 pc (486.14 l.y.)
 
 
Coord 2000 20057-3743 Discov num HDS2865 Comp Coord arcsec 2000 20 05 41.20 -37 42 53.2
Date first 1991 Date last 2021 Obs 10
Pa first 51 Pa last 184.9 P.A. Now (θ) 184.9°
Sep first 0.2 Sep last 0.136 Sep. Now (ρ) 0.136"
Mag pri 8.53 Mag sec 9.11 delta mag (ΔM) 0.58 Spectral class F3V (yellow-white)
Pri motion ra +017 Sec motion ra
Pri motion dec -007 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 190289 Constellation Sagittarius SAO 211799 HIP 98979
Tycho2 7947-03226-1 Gaia DR2 6696917383945134080 HD 190289 CD CD-3813850
CP CP-38 7940 Distance 149.03 Distance ly 486.14
 
 
ORBITAL ELEMENTS
 
 
Period (P)50y Periastron (T)2018.71y± 0.56 Semi-major axis (a)0.1778a± 0.0043
Eccentricity (e)0.328± 0.04 Inclination (i)131.5°± 4.2 Longitude of periastron (ω)131.7°± 6.6
Node (Ω)4.2°± 3.7 Notes ReferenceTok2016e
Equinox2000 Last observation Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 20.1 0.216
2001 17.1 0.216
2002 14.0 0.214
2003 10.9 0.212
2004 7.6 0.208
2005 4.3 0.203
2006 0.7 0.197
2007 356.9 0.189
2008 352.6 0.179
2009 347.9 0.168
2010 342.5 0.156
2011 336.1 0.142
2012 328.3 0.128
2013 318.4 0.113
2014 305.8 0.100
2015 289.7 0.089
2016 270.5 0.084
2017 250.3 0.085
2018 232.0 0.092
2019 216.8 0.102
2020 204.4 0.113
2021 194.1 0.122
2022 185.2 0.130
2023 177.0 0.134
2024 169.3 0.137
2025 161.8 0.138
2026 154.3 0.138
2027 146.7 0.137
2028 139.0 0.135
2029 131.1 0.134
2030 123.2 0.133


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



 
 


wds20057-3743a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic