11520+4805 HU  731 (MY UMa)

 
 
11H 51M 57.86S +48 05' 19.5" P.A. 307.6 SEP 1.19 MAG 9.81,9.68 SP K0V DIST. 46.1 PC (150.38 L.Y.)
 
 
Coord 2000
11520+4805
Discov num
HU  731
Comp
Coord arcsec 2000
11 51 57.86 +48 05 19.5
Date first
1902
Date last
2013
Obs
53
Pa first
296
Pa last
308
P.A. Now (θ)
307.6°
Sep first
0.3
Sep last
1.1
Sep. Now (ρ)
1.19"
Mag pri
9.81
Mag sec
9.68
delta mag (ΔM)
0.13
Spectral class
K0V (yellow-orange)
Pri motion ra
-217
Sec motion ra
-217
Pri motion dec
+047
Sec motion dec
+047
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name
MY UMa
Constellation
Ursa Major
SAO
43918
HIP
57859
Tycho2
3452-01353-1
ADS
8325
BD
BD+48 1978
Distance
46.1
Distance ly
150.38
last precise pa
307.6
last precise sep
1.14
 
 
ORBITAL ELEMENTS
 
 
Period (P)207.77y± 38.24 Periastron (T)1900.83y± 2 Semi-major axis (a)1.179a± 0.046
Eccentricity (e)0.705± 0.033 Inclination (i)96.6°± 1 Longitude of periastron (ω)301.1°± 7.8
Node (Ω)118.7°± 1.9 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2003
label rho theta
2000 0.997 310.4
2001 1.010 310.2
2002 1.023 310.0
2003 1.036 309.8
2004 1.048 309.6
2005 1.061 309.4
2006 1.073 309.3
2007 1.085 309.1
2008 1.096 308.9
2009 1.108 308.8
2010 1.119 308.6
2011 1.131 308.5
2012 1.142 308.3
2013 1.152 308.2
2014 1.163 308.0
2015 1.173 307.9
2016 1.183 307.7
2017 1.193 307.6
2018 1.203 307.4
2019 1.213 307.3
2020 1.222 307.2
2021 1.231 307.0
2022 1.240 306.9
2023 1.248 306.8
2024 1.257 306.7
2025 1.265 306.5
2026 1.273 306.4
2027 1.280 306.3
2028 1.288 306.2
2029 1.295 306.1
2030 1.301 305.9

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