09498+2111 KUI  44 (20 Leo)

 
 
09H 49M 50.12S +21 10' 46.0" P.A. 227.7 SEP 0.17 MAG 6.62,7.31 SP A7IVN DIST. 191.57 PC (624.9 L.Y.)
 
 
Coord 2000
09498+2111
Discov num
KUI  44
Comp
Coord arcsec 2000
09 49 50.12 +21 10 46.0
Date first
1935
Date last
2006
Obs
86
Pa first
222
Pa last
244
P.A. Now (θ)
227.7°
Sep first
0.3
Sep last
0.1
Sep. Now (ρ)
0.17"
Mag pri
6.62
Mag sec
7.31
delta mag (ΔM)
0.69
Spectral class
A7IVn (white)
Pri motion ra
-043
Sec motion ra
Pri motion dec
-012
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
20 Leo
Constellation
Leo
SAO
81035
HIP
48218
Tycho2
1417-01531-1
HD
85040
HR
3889
GC
13528
BD
BD+21 2113
Flamsteed
20 Leonis
Flamsteed name
20 Leo
Distance
191.57
Distance ly
624.9
last precise pa
244
last precise sep
0.053
 
 
ORBITAL ELEMENTS
 
 
Period (P)113.1y± 3.4 Periastron (T)2000.31y± 0.29 Semi-major axis (a)0.208a± 0.006
Eccentricity (e)0.887± 0.008 Inclination (i)107.5°± 0.9 Longitude of periastron (ω)332°± 4.1
Node (Ω)27.9°± 1.3 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2004
label rho theta
2000 0.014 57.1
2001 0.026 15.6
2002 0.022 342.9
2003 0.022 300.8
2004 0.031 272.2
2005 0.042 257.4
2006 0.054 249.1
2007 0.067 243.8
2008 0.079 240.2
2009 0.090 237.5
2010 0.101 235.4
2011 0.112 233.7
2012 0.122 232.3
2013 0.132 231.1
2014 0.142 230.1
2015 0.151 229.2
2016 0.161 228.4
2017 0.169 227.7
2018 0.178 227.1
2019 0.186 226.5
2020 0.194 226.0
2021 0.202 225.5
2022 0.209 225.0
2023 0.216 224.6
2024 0.223 224.2
2025 0.230 223.8
2026 0.237 223.5
2027 0.243 223.2
2028 0.249 222.8
2029 0.255 222.5
2030 0.261 222.2

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