20123-0806 BU 1205 (HD 191841)

 
 
20h 12m 15.32s -08 05' 32.1" P.A. 212.00 sep 0.2 mag 7.50,8.80 Sp F5V dist. 73.91 pc (241.09 l.y.)
 
 
Coord 2000 20123-0806 Discov num BU 1205 Comp Coord arcsec 2000 20 12 15.32 -08 05 32.1
Date first 1890 Date last 2008 Obs 22
Pa first 49 Pa last 211.8 P.A. Now (θ) 211.8°
Sep first 0.6 Sep last 0.247 Sep. Now (ρ) 0.247"
Mag pri 7.50 Mag sec 8.80 delta mag (ΔM) 1.3 Spectral class F5V (yellow-white)
Pri motion ra +015 Sec motion ra
Pri motion dec -035 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 191841 Constellation Aquila SAO 144164 HIP 99558
Tycho2 5740-00887-1 Gaia DR2 4215770852139704960 HD 191841 GC 28034
ADS 13493 BD BD-08 5272 Distance 73.91 Distance ly 241.09
 
 
ORBITAL ELEMENTS
 
 
Period (P)139.9y Periastron (T)1983.5y Semi-major axis (a)0.486a
Eccentricity (e)0.384 Inclination (i)78.3° Longitude of periastron (ω)10.4°
Node (Ω)231.24° Notes ReferenceHrt2010a
Equinox2000 Last observation2008 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 341.4 0.086
2001 355.0 0.098
2002 5.1 0.115
2003 12.5 0.134
2004 18.1 0.154
2005 22.3 0.175
2006 25.7 0.196
2007 28.4 0.217
2008 30.6 0.238
2009 32.4 0.258
2010 34.0 0.279
2011 35.4 0.299
2012 36.6 0.318
2013 37.6 0.337
2014 38.6 0.356
2015 39.4 0.374
2016 40.2 0.392
2017 40.9 0.409
2018 41.6 0.426
2019 42.2 0.442
2020 42.7 0.457
2021 43.3 0.472
2022 43.7 0.486
2023 44.2 0.500
2024 44.7 0.514
2025 45.1 0.526
2026 45.5 0.538
2027 45.9 0.550
2028 46.2 0.561
2029 46.6 0.571
2030 46.9 0.581


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



 
 


wds20123-0806a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic