11374+4728 KU 39 (DF UMa)

 
 
11h 37m 24.61s +47° 27' 44.8" P.A. 144.00 sep 1.2 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 2017 Obs 52
Pa first 22 Pa last 144.1 P.A. Now (θ) 144.1°
Sep first 2.5 Sep last 1.15 Sep. Now (ρ) 1.15"
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
 
 
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° Notesn ReferenceWSI2006b
Equinox2000 Last observation2005 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 112.2 1.272
2001 114.0 1.256
2002 115.9 1.239
2003 117.8 1.221
2004 119.7 1.202
2005 121.8 1.182
2006 123.9 1.160
2007 126.1 1.138
2008 128.3 1.114
2009 130.7 1.088
2010 133.2 1.060
2011 135.8 1.030
2012 138.6 0.998
2013 141.6 0.964
2014 144.9 0.927
2015 148.4 0.887
2016 152.2 0.845
2017 156.5 0.801
2018 161.2 0.754
2019 166.6 0.707
2020 172.8 0.659
2021 180.0 0.613
2022 188.2 0.571
2023 197.7 0.536
2024 208.2 0.511
2025 219.6 0.499
2026 231.2 0.501
2027 242.3 0.519
2028 252.5 0.549
2029 261.4 0.590
2030 269.1 0.638


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



 
 


wds11374%2B4728a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic