01398-5612 DUN   5 (p Eri)

 
 
01h 39m 47.83s -56 11' 36.0" P.A. 185.80 sep 11.6 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
176
Pa first
343
Pa last
186
P.A. Now (θ)
185.8°
Sep first
2.5
Sep last
11.3
Sep. Now (ρ)
11.6"
Mag pri
5.78
Mag sec
5.90
delta mag (ΔM)
0.12
Spectral class
K0V+K5V (yellow-orange/yellow-orange)
Pri motion ra
+322
Sec motion ra
+206
Pri motion dec
+096
Sec motion dec
-108
Notes
N O (See Notes, Orbital solution)
Visually invisible, K-band or other infrared star rPM=0.698
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
186
Precise sep
11.283
Other name
p Eri
Constellation
Eridanus
SAO
232492
HIP
7751
Tycho2
8478-01394-2
Gaia DR2
39828325632
HD
10360
HR
486
GC
2030
GL
Gl 66B
CD
CD-56 328
CP
CP-56 329
Distance
7.82
Distance ly
25.51
last precise pa
186
last precise sep
11.283
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2016
label rho theta
2000 11.420 190.4
2001 11.433 190.2
2002 11.446 190.0
2003 11.458 189.7
2004 11.470 189.5
2005 11.482 189.3
2006 11.493 189.0
2007 11.503 188.8
2008 11.514 188.6
2009 11.523 188.3
2010 11.533 188.1
2011 11.542 187.9
2012 11.550 187.6
2013 11.559 187.4
2014 11.566 187.2
2015 11.574 187.0
2016 11.581 186.7
2017 11.587 186.5
2018 11.593 186.3
2019 11.599 186.0
2020 11.604 185.8
2021 11.609 185.6
2022 11.613 185.4
2023 11.618 185.1
2024 11.621 184.9
2025 11.624 184.7
2026 11.627 184.4
2027 11.630 184.2
2028 11.632 184.0
2029 11.633 183.8
2030 11.635 183.5

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






wds01398-5612c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
01398-5612 DUN 5 2002 159 190 11.4 5.78 5.90 K0V K5V NOD 013947.55-561136.2
01398-5612 DUN 5 2009 161 188 11.6 5.78 5.90 K0V K5V NOD 013947.55-561136.2
01398-5612 DUN 5 2013 164 187 11.4 5.78 5.90 K0V K5V NO 013947.55-561136.2
01398-5612 DUN 5 2016 167 186 11.5 5.78 5.90 K0V+K5V NO 013947.83-561136.0
01398-5612 DUN 5 2017 173 187 11.4 5.78 5.90 K0V+K5V NO 013947.83-561136.0
01398-5612 DUN 5 2019 176 186 11.3 5.78 5.90 K0V+K5V NO 013947.83-561136.0

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