20217-3637 HDS 2908 (HD 193464)

 
 
20h 21m 43.04s -36° 36' 35.9" P.A. 133.00 sep 0.0 mag 8.25,8.45 Sp G0/G1V dist. 59.38 pc (193.7 l.y.)
 
 
Coord 2000 20217-3637 Discov num HDS2908 Comp Coord arcsec 2000 20 21 43.04 -36 36 35.9
Date first 1991 Date last 2021 Obs 13
Pa first 108 Pa last 133.1 P.A. Now (θ) 268.3°
Sep first 0.1 Sep last 0.025 Sep. Now (ρ) 0.057"
Mag pri 8.25 Mag sec 8.45 delta mag (ΔM) 0.2 Spectral class G0/G1V (yellow)
Pri motion ra +068 Sec motion ra
Pri motion dec -044 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 193464 Constellation Sagittarius SAO 212038 HIP 100417
Tycho2 7454-00791-1 Gaia DR2 6695767221764909824 HD 193464 CD CD-3713693
CP CP-37 8776 Distance 59.38 Distance ly 193.7
 
 
ORBITAL ELEMENTS
 
 
Period (P)12.74y± 0.24 Periastron (T)2007.44y± 0.52 Semi-major axis (a)0.112a± 0.0065
Eccentricity (e)0.518± 0.046 Inclination (i)80.8°± 2.7 Longitude of periastron (ω)338.9°± 10.7
Node (Ω)107.8°± 0.6 Notes ReferenceTok2016e
Equinox2000 Last observation Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 282.0 0.141
2001 284.1 0.158
2002 286.0 0.164
2003 287.8 0.158
2004 290.0 0.139
2005 293.3 0.104
2006 302.4 0.049
2007 89.7 0.027
2008 113.4 0.053
2009 163.1 0.018
2010 263.4 0.045
2011 275.5 0.088
2012 279.9 0.122
2013 282.6 0.147
2014 284.6 0.161
2015 286.4 0.164
2016 288.3 0.155
2017 290.7 0.132
2018 294.6 0.092
2019 310.4 0.032
2020 100.3 0.043
2021 118.5 0.046
2022 209.0 0.017
2023 268.3 0.057
2024 276.9 0.098
2025 280.7 0.129
2026 283.2 0.151
2027 285.1 0.163
2028 286.9 0.163
2029 288.9 0.150
2030 291.4 0.123


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



 
 


wds20217-3637a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic