18092-2211 RST 3157 (HD 165893)

 
 
18h 09m 12.18s -22° 11' 00.6" P.A. 143.00 sep 0.1 mag 9.58,9.92 Sp K3/4V dist. 32.8 pc (106.99 l.y.)
 
 
Coord 2000 18092-2211 Discov num RST3157 Comp Coord arcsec 2000 18 09 12.18 -22 11 00.6
Date first 1935 Date last 2021 Obs 33
Pa first 109 Pa last 143.3 P.A. Now (θ) 206.7°
Sep first 0.2 Sep last 0.132 Sep. Now (ρ) 0.117"
Mag pri 9.58 Mag sec 9.92 delta mag (ΔM) 0.34 Spectral class K3/4V (yellow-orange)
Pri motion ra -015 Sec motion ra
Pri motion dec -085 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 165893 Constellation Sagittarius SAO 186363 HIP 88932
Tycho2 6276-00651-1 Gaia DR2 4069746980613766144 HD 165893 BD BD-22 4584
CD CD-2212617 CP CP-22 6736 Distance 32.8 Distance ly 106.99
 
 
ORBITAL ELEMENTS
 
 
Period (P)9.32y Periastron (T)2015.185y Semi-major axis (a)0.149a
Eccentricity (e)0.413 Inclination (i)48.1° Longitude of periastron (ω)238.6°
Node (Ω)63.1° Notes ReferenceTok2018e
Equinox2000 Last observation2018 Grade1(1=Definitive, 9=Indet.)
label theta rho
2000 89.5 0.179
2001 106.7 0.167
2002 128.2 0.145
2003 157.2 0.126
2004 193.0 0.118
2005 232.4 0.109
2006 307.6 0.062
2007 40.7 0.114
2008 67.3 0.165
2009 84.4 0.180
2010 100.9 0.172
2011 120.7 0.152
2012 147.0 0.131
2013 181.1 0.119
2014 219.1 0.114
2015 272.3 0.078
2016 24.3 0.089
2017 60.7 0.153
2018 79.2 0.178
2019 95.4 0.177
2020 113.8 0.159
2021 137.7 0.137
2022 169.6 0.121
2023 206.7 0.117
2024 250.2 0.096
2025 356.1 0.067
2026 52.7 0.137
2027 73.8 0.174
2028 90.2 0.179
2029 107.5 0.166
2030 129.2 0.144


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



 
 


wds18092-2211d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic