11037+6145 BU 1077 AB (Dubhe)

 
 
11h 03m 43.84s +61° 45' 04.0" P.A. 342.00 sep 0.8 mag 2.02,4.95 Sp G9III dist. 37.68 pc (122.91 l.y.)
 
 
Coord 2000 11037+6145 Discov num BU 1077 Comp AB Coord arcsec 2000 11 03 43.84 +61 45 04.0
Date first 1889 Date last 2017 Obs 83
Pa first 326 Pa last 342.3 P.A. Now (θ) 323.2°
Sep first 0.9 Sep last 0.806 Sep. Now (ρ) 0.819"
Mag pri 2.02 Mag sec 4.95 delta mag (ΔM) 2.93 Spectral class G9III (yellow)
Pri motion ra -119 Sec motion ra
Pri motion dec -067 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
11037+6145 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Dubhe 15384 11 03 44 +61 45 04 BU 1077 AB 2017 83 342 0.8 2.02 4.95 2.93 Y <===
Show 15384 11 03 44 +61 45 04 BU 1077 AC 2020 15 206 384.5 2.02 7.19 5.17
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Dubhe Var name NSV5070 UMa Constellation Ursa Major SAO 15384
HIP 54061 Tycho2 4146-01274-1 HD 95689 HR 4301
GC 15185 ADS 8035 BD BD+62 1161 Bayer Alpha Ursae Majoris
Bayer name Alp UMa Flamsteed 50 Ursae Majoris Flamsteed name 50 UMa FK5 417
Distance 37.68 Distance ly 122.91 Bayer greek α UMa
Other names DUBB, AK
Meaning Bear
 
 
ORBITAL ELEMENTS
 
 
Period (P)44.448y± 0.11 Periastron (T)2002.17y± 0.094 Semi-major axis (a)0.59a± 0.026
Eccentricity (e)0.4392± 0.004 Inclination (i)159.9°± 3.5 Longitude of periastron (ω)232.8°± 7.9
Node (Ω)9.3°± 8.2 Notesn ReferenceSca2011a
Equinox2000 Last observation2010 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 183.7 0.366
2001 164.4 0.338
2002 142.2 0.320
2003 118.6 0.318
2004 96.1 0.335
2005 76.6 0.367
2006 60.7 0.408
2007 47.9 0.453
2008 37.3 0.498
2009 28.5 0.542
2010 21.0 0.582
2011 14.4 0.619
2012 8.5 0.653
2013 3.2 0.683
2014 358.3 0.710
2015 353.7 0.734
2016 349.4 0.754
2017 345.4 0.772
2018 341.4 0.786
2019 337.6 0.798
2020 334.0 0.807
2021 330.3 0.813
2022 326.8 0.817
2023 323.2 0.819
2024 319.7 0.818
2025 316.1 0.814
2026 312.5 0.809
2027 308.8 0.801
2028 305.0 0.791
2029 301.2 0.779
2030 297.2 0.765


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



 
 


wds11037%2B6145a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic