11374+4728 KU   39 (DF UMa)

 
 
11H 37M 24.61S +47 27' 44.8" P.A. 156.5 SEP 0.8 MAG 10.68,11.16 SP K4V DIST. 31.3 PC (102.1 L.Y.)
 
 
Coord 2000
11374+4728
Discov num
KU   39
Comp
Coord arcsec 2000
11 37 24.61 +47 27 44.8
Date first
1901
Date last
2010
Obs
48
Pa first
22
Pa last
129
P.A. Now (θ)
156.5°
Sep first
2.5
Sep last
1.1
Sep. Now (ρ)
0.8"
Mag pri
10.68
Mag sec
11.16
delta mag (ΔM)
0.48
Spectral class
K4V (yellow-orange)
Pri motion ra
+098
Sec motion ra
+098
Pri motion dec
-024
Sec motion dec
-024
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name
DF UMa
Constellation
Ursa Major
HIP
56685
Tycho2
3451-00540-1
ADS
8242
BD
BD+48 1958
Distance
31.3
Distance ly
102.1
last precise pa
129.4
last precise sep
1.133
 
 
ORBITAL ELEMENTS
 
 
Period (P)278.8y Periastron (T)1743.8y Semi-major axis (a)2.14a
Eccentricity (e)0.65 Inclination (i)50.1° Longitude of periastron (ω)62.5°
Node (Ω)142.8° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2005
label rho theta
2000 1.272 112.2
2001 1.256 114.0
2002 1.239 115.9
2003 1.221 117.8
2004 1.202 119.7
2005 1.182 121.8
2006 1.160 123.9
2007 1.138 126.1
2008 1.114 128.3
2009 1.088 130.7
2010 1.060 133.2
2011 1.030 135.8
2012 0.998 138.6
2013 0.964 141.6
2014 0.927 144.9
2015 0.887 148.4
2016 0.845 152.2
2017 0.801 156.5
2018 0.754 161.2
2019 0.707 166.6
2020 0.659 172.8
2021 0.613 180.0
2022 0.571 188.2
2023 0.536 197.7
2024 0.511 208.2
2025 0.499 219.6
2026 0.501 231.2
2027 0.519 242.3
2028 0.549 252.5
2029 0.590 261.4
2030 0.638 269.1

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