03307-1926 HDS 441 (HD 21841)

 
 
03h 30m 40.06s -19° 26' 08.0" P.A. 34.00 sep 0.2 mag 8.22,8.47 Sp G5V dist. 44.4 pc (144.83 l.y.)
 
 
Coord 2000 03307-1926 Discov num HDS 441 Comp Coord arcsec 2000 03 30 40.06 -19 26 08.0
Date first 1991 Date last 2021 Obs 25
Pa first 195 Pa last 33.5 P.A. Now (θ) 26.8°
Sep first 0.2 Sep last 0.156 Sep. Now (ρ) 0.179"
Mag pri 8.22 Mag sec 8.47 delta mag (ΔM) 0.25 Spectral class G5V (yellow)
Pri motion ra +000 Sec motion ra
Pri motion dec -007 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 21841 Constellation Eridanus SAO 149001 HIP 16348
Tycho2 5876-00918-1 Gaia DR2 5101676365959144832 HD 21841 BD BD-19 694
Distance 44.4 Distance ly 144.83
 
 
ORBITAL ELEMENTS
 
 
Period (P)18.964y± 0.125 Periastron (T)2007.281y± 0.149 Semi-major axis (a)0.2181a± 0.0097
Eccentricity (e)0.5± 0.059 Inclination (i)102.7°± 1.1 Longitude of periastron (ω)84.4°± 9.8
Node (Ω)17.8°± 0.9 Notes ReferenceCve2016b
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 66.5 0.090
2001 50.1 0.117
2002 39.8 0.144
2003 32.7 0.167
2004 27.0 0.179
2005 21.6 0.174
2006 14.7 0.136
2007 351.4 0.050
2008 213.2 0.078
2009 199.9 0.156
2010 194.4 0.192
2011 190.0 0.201
2012 185.7 0.194
2013 180.7 0.175
2014 174.2 0.150
2015 164.8 0.122
2016 149.8 0.094
2017 124.9 0.075
2018 92.2 0.074
2019 65.8 0.091
2020 49.6 0.118
2021 39.5 0.145
2022 32.5 0.167
2023 26.8 0.179
2024 21.4 0.173
2025 14.3 0.134
2026 348.7 0.046
2027 212.2 0.081
2028 199.7 0.158
2029 194.2 0.193
2030 189.9 0.201


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



 
 


wds03307-1926a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic