10557+0044 BU 1076 (55 Leo)

 
 
10h 55m 42.40s +00° 44' 13.0" P.A. 48.00 sep 1.1 mag 5.98,9.02 Sp F4V dist. 44.86 pc (146.33 l.y.)
 
 
Coord 2000 10557+0044 Discov num BU 1076 Comp Coord arcsec 2000 10 55 42.40 +00 44 13.0
Date first 1889 Date last 2021 Obs 62
Pa first 50 Pa last 48.4 P.A. Now (θ) 47.9°
Sep first 1.0 Sep last 1.075 Sep. Now (ρ) 1.064"
Mag pri 5.98 Mag sec 9.02 delta mag (ΔM) 3.04 Spectral class F4V (yellow-white)
Pri motion ra +100 Sec motion ra +103
Pri motion dec +000 Sec motion dec -003
Notes N O (See Notes, Orbital solution)
rPM=0.041 (< 0.3, Physical double)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 55 Leo Constellation Leo SAO 118574 HIP 53423
Tycho2 0255-01197-1 Gaia DR2 3807937319101754112 HD 94672 HR 4265
GC 15022 ADS 7982 BD BD+01 2501 Flamsteed 55 Leonis
Flamsteed name 55 Leo Distance 44.86 Distance ly 146.33
 
 
ORBITAL ELEMENTS
 
 
Period (P)138.9y± 3.02 Periastron (T)1921.62y± 5.07 Semi-major axis (a)0.75a± 0.069
Eccentricity (e)0.714± 0.036 Inclination (i)125.7°± 9.5 Longitude of periastron (ω)323.4°± 10.8
Node (Ω)219.3°± 4 Notesn ReferenceTok2015c
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 58.7 1.154
2001 58.2 1.155
2002 57.8 1.156
2003 57.3 1.156
2004 56.9 1.156
2005 56.4 1.156
2006 56.0 1.155
2007 55.5 1.154
2008 55.1 1.152
2009 54.6 1.149
2010 54.2 1.147
2011 53.7 1.143
2012 53.3 1.140
2013 52.8 1.136
2014 52.3 1.131
2015 51.9 1.126
2016 51.4 1.120
2017 50.9 1.114
2018 50.4 1.107
2019 50.0 1.100
2020 49.5 1.092
2021 49.0 1.083
2022 48.4 1.074
2023 47.9 1.064
2024 47.4 1.054
2025 46.8 1.043
2026 46.3 1.031
2027 45.7 1.019
2028 45.1 1.006
2029 44.5 0.992
2030 43.9 0.978


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



 
 


wds10557%2B0044d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic