20012-3835 HDO 294 (HD 189386)

 
 
20h 01m 12.74s -38 35' 12.7" P.A. 33.00 sep 1.3 mag 8.08,9.11 Sp F3V dist. 68.49 pc (223.41 l.y.)
 
 
Coord 2000 20012-3835 Discov num HDO 294 Comp Coord arcsec 2000 20 01 12.74 -38 35 12.7
Date first 1897 Date last 2019 Obs 63
Pa first 120 Pa last 33.2 P.A. Now (θ) 33.2°
Sep first 1.5 Sep last 1.26 Sep. Now (ρ) 1.26"
Mag pri 8.08 Mag sec 9.11 delta mag (ΔM) 1.03 Spectral class F3V (yellow-white)
Pri motion ra +018 Sec motion ra +018
Pri motion dec -070 Sec motion dec -070
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 189386 Constellation Sagittarius SAO 211734 HIP 98556
Tycho2 7947-00530-1 Gaia DR2 6690907208575405056 HD 189386 GC 27717
CD CD-3813809 CP CP-38 7919 Distance 68.49 Distance ly 223.41
 
 
ORBITAL ELEMENTS
 
 
Period (P)4484.5y Periastron (T)1922.73y Semi-major axis (a)4.916a
Eccentricity (e)0.9474 Inclination (i)40.86° Longitude of periastron (ω)137.62°
Node (Ω)116.65° Notesn ReferenceDom1978
Equinox1900 Last observation1974 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 30.7 1.173
2001 31.0 1.184
2002 31.4 1.195
2003 31.7 1.206
2004 32.0 1.217
2005 32.3 1.228
2006 32.6 1.239
2007 32.9 1.250
2008 33.2 1.261
2009 33.5 1.271
2010 33.8 1.282
2011 34.1 1.293
2012 34.4 1.304
2013 34.7 1.314
2014 34.9 1.325
2015 35.2 1.336
2016 35.5 1.346
2017 35.7 1.357
2018 36.0 1.367
2019 36.2 1.378
2020 36.5 1.388
2021 36.7 1.399
2022 36.9 1.409
2023 37.2 1.419
2024 37.4 1.430
2025 37.6 1.440
2026 37.9 1.450
2027 38.1 1.460
2028 38.3 1.471
2029 38.5 1.481
2030 38.7 1.491


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



 
 


wds20012-3835a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic