01398-5612 DUN 5 (p Eri)

 
 
01h 39m 47.83s -56° 11' 36.0" P.A. 186.00 sep 11.3 mag 5.78,5.90 Sp K0V+K5V dist. 7.82 pc (25.51 l.y.)
 
 
Coord 2000 01398-5612 Discov num DUN   5 Comp Coord arcsec 2000 01 39 47.83 -56 11 36.0
Date first 1825 Date last 2019 Obs 177
Pa first 343 Pa last 186 P.A. Now (θ) 186°
Sep first 2.5 Sep last 11.283 Sep. Now (ρ) 11.283"
Mag pri 5.78 Mag sec 5.90 delta mag (ΔM) 0.12 Spectral class K0V+K5V (yellow-orange/yellow-orange)
Pri motion ra +262 Sec motion ra +309
Pri motion dec +015 Sec motion dec +011
Notes N O T (See Notes, Orbital solution, Parallax indicates physical)
rPM=0.153 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name p Eri Constellation Eridanus SAO 232490 HIP 7751
Tycho2 8478-01394-2 Gaia DR2 4911306239828325632 HD 10361 HR 486
GC 2030 GL Gl 66B CD CD-56 328 CP CP-56 329
Distance 7.82 Distance ly 25.51
 
 
ORBITAL ELEMENTS
 
 
Period (P)493.3y Periastron (T)1811.9y Semi-major axis (a)7.98a
Eccentricity (e)0.499 Inclination (i)139.6° Longitude of periastron (ω)24.9°
Node (Ω)16.5° Notesn ReferenceSca2018e
Equinox2000 Last observation2016 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 190.4 11.420
2001 190.2 11.433
2002 190.0 11.446
2003 189.7 11.458
2004 189.5 11.470
2005 189.3 11.482
2006 189.0 11.493
2007 188.8 11.503
2008 188.6 11.514
2009 188.3 11.523
2010 188.1 11.533
2011 187.9 11.542
2012 187.6 11.550
2013 187.4 11.559
2014 187.2 11.566
2015 187.0 11.574
2016 186.7 11.581
2017 186.5 11.587
2018 186.3 11.593
2019 186.0 11.599
2020 185.8 11.604
2021 185.6 11.609
2022 185.4 11.613
2023 185.1 11.618
2024 184.9 11.621
2025 184.7 11.624
2026 184.4 11.627
2027 184.2 11.630
2028 184.0 11.632
2029 183.8 11.633
2030 183.5 11.635


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


 
  


wds01398-5612c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic