00325-6800 DON 7 (HD 2989)

 
 
00h 32m 28.68s -68 00' 26.8" P.A. 259.00 sep 0.5 mag 10.32,10.06 Sp G5 dist. 50.74 pc (165.51 l.y.)
 
 
Coord 2000 00325-6800 Discov num DON   7 Comp Coord arcsec 2000 00 32 28.68 -68 00 26.8
Date first 1928 Date last 2019 Obs 5
Pa first 74 Pa last 258.9 P.A. Now (θ) 258.9°
Sep first 0.6 Sep last 0.538 Sep. Now (ρ) 0.538"
Mag pri 10.32 Mag sec 10.06 delta mag (ΔM) 0.26 Spectral class G5 (yellow)
Pri motion ra +106 Sec motion ra +106
Pri motion dec +063 Sec motion dec +063
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 2989 Constellation Tucana HIP 2556 Tycho2 9135-00172-1
Gaia DR2 4703771835241607680 HD 2989 CP CP-68 15 Distance 50.74
Distance ly 165.51
 
 
ORBITAL ELEMENTS
 
 
Period (P)150y Periastron (T)2037.8y Semi-major axis (a)0.608a
Eccentricity (e)0.186 Inclination (i)180° Longitude of periastron (ω)337°
Node (Ω)175° Notes ReferenceTok2020e
Equinox Last observation2019 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 309.5 0.630
2001 307.3 0.625
2002 305.0 0.621
2003 302.8 0.616
2004 300.5 0.611
2005 298.1 0.607
2006 295.7 0.602
2007 293.3 0.597
2008 290.8 0.592
2009 288.3 0.588
2010 285.8 0.583
2011 283.2 0.578
2012 280.6 0.573
2013 277.9 0.568
2014 275.2 0.564
2015 272.4 0.559
2016 269.6 0.554
2017 266.7 0.550
2018 263.8 0.545
2019 260.9 0.541
2020 257.9 0.537
2021 254.8 0.533
2022 251.7 0.529
2023 248.6 0.525
2024 245.4 0.521
2025 242.2 0.518
2026 238.9 0.515
2027 235.6 0.512
2028 232.2 0.509
2029 228.8 0.506
2030 225.4 0.504


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



 
 


wds00325-6800a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic