03178-1407 HU 432 (HD 20530)

 
 
03h 17m 45.24s -14° 06' 46.6" P.A. 101.00 sep 0.2 mag 10.40,10.40 Sp K0V
 
 
Coord 2000 03178-1407 Discov num HU  432 Comp Coord arcsec 2000 03 17 45.24 -14 06 46.6
Date first 1901 Date last 2020 Obs 8
Pa first 46 Pa last 100.9 P.A. Now (θ) 100.9°
Sep first 0.2 Sep last 0.184 Sep. Now (ρ) 0.184"
Mag pri 10.40 Mag sec 10.40 delta mag (ΔM) 0 Spectral class K0V (yellow-orange)
Pri motion ra +064 Sec motion ra
Pri motion dec +027 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 20530 Constellation Eridanus SAO 148887 Tycho2 5301-01012-1
Gaia DR2 5155370883158999808 HD 20530 ADS 2456
 
 
ORBITAL ELEMENTS
 
 
Period (P)73.67y Periastron (T)1979.23y Semi-major axis (a)0.2017a
Eccentricity (e)0.152 Inclination (i)40.4° Longitude of periastron (ω)223.2°
Node (Ω)45.4° Notes ReferenceTok2020e
Equinox Last observation2019 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 30.6 0.207
2001 34.1 0.211
2002 37.4 0.215
2003 40.5 0.218
2004 43.7 0.220
2005 46.7 0.222
2006 49.7 0.224
2007 52.7 0.224
2008 55.7 0.224
2009 58.6 0.224
2010 61.6 0.223
2011 64.7 0.222
2012 67.7 0.220
2013 70.9 0.217
2014 74.1 0.215
2015 77.4 0.212
2016 80.7 0.208
2017 84.2 0.205
2018 87.9 0.201
2019 91.6 0.197
2020 95.6 0.193
2021 99.6 0.190
2022 103.9 0.186
2023 108.3 0.182
2024 112.9 0.179
2025 117.7 0.175
2026 122.7 0.173
2027 127.8 0.170
2028 133.0 0.168
2029 138.3 0.167
2030 143.7 0.166


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



 
 


wds03178-1407b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic