04571-1338 A 2625 (HD 31656)

 
 
04h 57m 04.79s -13° 38' 02.6" P.A. 182.00 sep 0.1 mag 9.90,9.90 Sp F2V
 
 
Coord 2000 04571-1338 Discov num A  2625 Comp Coord arcsec 2000 04 57 04.79 -13 38 02.6
Date first 1913 Date last 2021 Obs 12
Pa first 359 Pa last 181.6 P.A. Now (θ) 198.4°
Sep first 0.3 Sep last 0.057 Sep. Now (ρ) 0.047"
Mag pri 9.90 Mag sec 9.90 delta mag (ΔM) 0 Spectral class F2V (yellow-white)
Pri motion ra -002 Sec motion ra
Pri motion dec -028 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 31656 Constellation Eridanus SAO 150016 Tycho2 5329-00117-1
Gaia DR2 2987535790325735168 HD 31656 ADS 3559
 
 
ORBITAL ELEMENTS
 
 
Period (P)178.2y± 42.5 Periastron (T)2022.16y± 1.02 Semi-major axis (a)0.177a± 0.014
Eccentricity (e)0.664± 0.029 Inclination (i)51°± 7.8 Longitude of periastron (ω)42.5°± 5.4
Node (Ω)157.8°± 14 Notes ReferenceTok2021c
Equinox2000 Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 78.5 0.103
2001 81.4 0.101
2002 84.4 0.098
2003 87.5 0.096
2004 90.8 0.094
2005 94.2 0.092
2006 97.8 0.091
2007 101.5 0.089
2008 105.3 0.087
2009 109.3 0.086
2010 113.4 0.084
2011 117.6 0.083
2012 122.0 0.082
2013 126.6 0.080
2014 131.3 0.078
2015 136.3 0.077
2016 141.5 0.075
2017 147.1 0.072
2018 153.0 0.069
2019 159.6 0.065
2020 167.1 0.061
2021 175.7 0.056
2022 185.9 0.051
2023 198.4 0.047
2024 213.2 0.043
2025 229.9 0.042
2026 246.7 0.043
2027 261.9 0.046
2028 274.3 0.052
2029 284.2 0.058
2030 291.9 0.066


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



 
 


wds04571-1338a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic