20471+2525 BU 364 (HD 198057)

 
 
20h 47m 03.56s +25° 24' 49.3" P.A. 75.00 sep 0.7 mag 9.00,9.12 Sp G5
 
 
Coord 2000 20471+2525 Discov num BU  364 Comp Coord arcsec 2000 20 47 03.56 +25 24 49.3
Date first 1874 Date last 2016 Obs 76
Pa first 38 Pa last 75.3 P.A. Now (θ) 75.3°
Sep first 1.0 Sep last 0.731 Sep. Now (ρ) 0.731"
Mag pri 9.00 Mag sec 9.12 delta mag (ΔM) 0.12 Spectral class G5 (yellow)
Pri motion ra -025 Sec motion ra -025
Pri motion dec -049 Sec motion dec -049
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 198057 Constellation Vulpecula Tycho2 2174-01913-1 Gaia DR2 1843762497341672320
HD 198057 ADS 14286
 
 
ORBITAL ELEMENTS
 
 
Period (P)856.1062y± 410.4471 Periastron (T)2067.136y± 41.9511 Semi-major axis (a)1.29945a± 0.51201
Eccentricity (e)0.65375± 0.28364 Inclination (i)59.674°± 13.165 Longitude of periastron (ω)108.976°± 43.173
Node (Ω)64.075°± 21.034 Notes ReferenceIzm2019
Equinox Last observation2013 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 66.4 0.885
2001 66.8 0.877
2002 67.1 0.868
2003 67.5 0.859
2004 67.9 0.850
2005 68.3 0.841
2006 68.6 0.831
2007 69.0 0.822
2008 69.4 0.813
2009 69.9 0.803
2010 70.3 0.793
2011 70.7 0.783
2012 71.2 0.773
2013 71.6 0.763
2014 72.1 0.753
2015 72.6 0.742
2016 73.1 0.731
2017 73.6 0.721
2018 74.1 0.710
2019 74.7 0.699
2020 75.3 0.688
2021 75.8 0.676
2022 76.4 0.665
2023 77.1 0.653
2024 77.7 0.641
2025 78.4 0.629
2026 79.1 0.617
2027 79.8 0.605
2028 80.6 0.593
2029 81.4 0.580
2030 82.2 0.568


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



 
 


wds20471%2B2525a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic