10557+0044 BU 1076 (55 Leo)

 
 
10H 55M 42.40S +00 44' 13.0" P.A. 50.9 SEP 1.11 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
2014
Obs
59
Pa first
50
Pa last
53
P.A. Now (θ)
50.9°
Sep first
1.0
Sep last
1.1
Sep. Now (ρ)
1.11"
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
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
last precise pa
52.5
last precise sep
1.142
 
 
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 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 1.154 58.7
2001 1.155 58.2
2002 1.156 57.8
2003 1.156 57.3
2004 1.156 56.9
2005 1.156 56.4
2006 1.155 56.0
2007 1.154 55.5
2008 1.152 55.1
2009 1.149 54.6
2010 1.147 54.2
2011 1.143 53.7
2012 1.140 53.3
2013 1.136 52.8
2014 1.131 52.3
2015 1.126 51.9
2016 1.120 51.4
2017 1.114 50.9
2018 1.107 50.4
2019 1.100 50.0
2020 1.092 49.5
2021 1.083 49.0
2022 1.074 48.4
2023 1.064 47.9
2024 1.054 47.4
2025 1.043 46.8
2026 1.031 46.3
2027 1.019 45.7
2028 1.006 45.1
2029 0.992 44.5
2030 0.978 43.9

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