04242-5704 RMK 4 (HD 28255)

 
 
04h 24m 12.21s -57° 04' 16.8" P.A. 248.00 sep 5.3 mag 6.87,7.23 Sp G4V dist. 27.7 pc (90.36 l.y.)
 
 
Coord 2000 04242-5704 Discov num RMK   4 Comp Coord arcsec 2000 04 24 12.21 -57 04 16.8
Date first 1834 Date last 2015 Obs 55
Pa first 226 Pa last 248.3 P.A. Now (θ) 248.3°
Sep first 5.0 Sep last 5.34 Sep. Now (ρ) 5.34"
Mag pri 6.87 Mag sec 7.23 delta mag (ΔM) 0.36 Spectral class G4V (yellow)
Pri motion ra -104 Sec motion ra -100
Pri motion dec -074 Sec motion dec -060
Notes C (Has orbit and linear solution)
rPM=0.114 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 28255 Constellation Dorado SAO 233506 HIP 20552
Tycho2 8505-01902-1 Gaia DR2 4775347916201249792 HD 28255 HR 1405
GC 5366 GL Wo 9155A CP CP-57 659 Distance 27.7
Distance ly 90.36
 
 
ORBITAL ELEMENTS
 
 
Period (P)2400y± 400 Periastron (T)1900y± 110 Semi-major axis (a)8a± 1.1
Eccentricity (e)0.22± 0.05 Inclination (i)70°± 2 Longitude of periastron (ω)200°± 30
Node (Ω)54.9°± 0.7 Notes ReferenceLRR2018b
Equinox2000 Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 253.1 4.814
2001 253.2 4.800
2002 253.3 4.786
2003 253.5 4.773
2004 253.6 4.759
2005 253.8 4.745
2006 253.9 4.732
2007 254.0 4.718
2008 254.2 4.704
2009 254.3 4.690
2010 254.5 4.676
2011 254.6 4.662
2012 254.8 4.649
2013 254.9 4.635
2014 255.1 4.621
2015 255.2 4.607
2016 255.4 4.592
2017 255.5 4.578
2018 255.7 4.564
2019 255.8 4.550
2020 256.0 4.536
2021 256.1 4.522
2022 256.3 4.507
2023 256.5 4.493
2024 256.6 4.479
2025 256.8 4.465
2026 256.9 4.450
2027 257.1 4.436
2028 257.3 4.421
2029 257.4 4.407
2030 257.6 4.393


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



 
 


wds04242-5704a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic