03184-2231 SEE  23 (15 Eri)

 
 
03H 18M 22.10S -22 30' 40.1" P.A. 121.4 SEP 0.21 MAG 6.57,5.32 SP G8IV DIST. 78.31 PC (255.45 L.Y.)
 
 
Coord 2000
03184-2231
Discov num
SEE  23
Comp
Coord arcsec 2000
03 18 22.10 -22 30 40.1
Date first
1897
Date last
2011
Obs
62
Pa first
110
Pa last
102
P.A. Now (θ)
121.4°
Sep first
0.3
Sep last
0.3
Sep. Now (ρ)
0.21"
Mag pri
6.57
Mag sec
5.32
delta mag (ΔM)
1.25
Spectral class
G8IV (yellow)
Pri motion ra
+013
Sec motion ra
Pri motion dec
+019
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
15 Eri
Constellation
Eridanus
SAO
168452
HIP
15382
Tycho2
6439-01171-1
HD
20610
HR
994
GC
3955
ADS
2463
CD
CD-22 1146
CP
CP-22 349
Flamsteed
15 Eridani
Flamsteed name
15 Eri
Distance
78.31
Distance ly
255.45
last precise pa
102.1
last precise sep
0.326
 
 
ORBITAL ELEMENTS
 
 
Period (P)118.16y Periastron (T)1934.24y Semi-major axis (a)0.34a
Eccentricity (e)0.03 Inclination (i)66.6° Longitude of periastron (ω)333.5°
Node (Ω)271.6° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2016
label rho theta
2000 0.347 88.7
2001 0.349 89.8
2002 0.349 91.0
2003 0.349 92.1
2004 0.348 93.3
2005 0.346 94.4
2006 0.344 95.6
2007 0.340 96.8
2008 0.336 98.0
2009 0.332 99.3
2010 0.326 100.6
2011 0.320 101.9
2012 0.313 103.3
2013 0.305 104.8
2014 0.297 106.3
2015 0.289 108.0
2016 0.279 109.7
2017 0.270 111.5
2018 0.260 113.5
2019 0.249 115.7
2020 0.238 118.1
2021 0.227 120.6
2022 0.216 123.5
2023 0.205 126.7
2024 0.194 130.2
2025 0.183 134.1
2026 0.172 138.6
2027 0.163 143.6
2028 0.154 149.1
2029 0.146 155.3
2030 0.140 162.2

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic