02514-2139 DON  43

 
 
02H 51M 21.23S -21 38' 40.9" P.A. 279.3 SEP 0.21 MAG 9.80,10.00 SP F2+F4
 
 
Coord 2000
02514-2139
Discov num
DON  43
Comp
Coord arcsec 2000
02 51 21.23 -21 38 40.9
Date first
1930
Date last
2015
Obs
13
Pa first
334
Pa last
276
P.A. Now (θ)
279.3°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.21"
Mag pri
9.80
Mag sec
10.00
delta mag (ΔM)
0.2
Spectral class
F2+F4 (yellow-white/yellow-white)
Pri motion ra
+073
Sec motion ra
Pri motion dec
-001
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Eridanus
Tycho2
5870-00612-1
HD
17884
last precise pa
276
last precise sep
0.205
 
 
ORBITAL ELEMENTS
 
 
Period (P)108.42y± 2.5 Periastron (T)1972.75y± 0.3 Semi-major axis (a)0.242a± 0.004
Eccentricity (e)0.362± 0.003 Inclination (i)52.1°± 0.5 Longitude of periastron (ω)94.1°± 2.5
Node (Ω)29.6°± 0.5 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2015
label rho theta
2000 0.229 239.3
2001 0.229 241.4
2002 0.228 243.6
2003 0.226 245.7
2004 0.225 247.9
2005 0.224 250.1
2006 0.222 252.4
2007 0.220 254.6
2008 0.219 256.9
2009 0.217 259.3
2010 0.215 261.7
2011 0.214 264.1
2012 0.212 266.5
2013 0.211 269.0
2014 0.209 271.5
2015 0.208 274.1
2016 0.207 276.7
2017 0.205 279.3
2018 0.204 282.0
2019 0.204 284.6
2020 0.203 287.3
2021 0.202 290.0
2022 0.202 292.8
2023 0.202 295.5
2024 0.202 298.2
2025 0.202 300.9
2026 0.203 303.7
2027 0.203 306.4
2028 0.204 309.0
2029 0.205 311.7
2030 0.206 314.3

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