09104+6708 STF 1306 AB (Sig2 UMa)

 
 
09h 10m 23.53s +67° 08' 03.3" P.A. 346.00 sep 4.4 mag 4.87,8.85 Sp F7V dist. 20.38 pc (66.48 l.y.)
 
 
Coord 2000 09104+6708 Discov num STF1306 Comp AB Coord arcsec 2000 09 10 23.53 +67 08 03.3
Date first 1782 Date last 2020 Obs 233
Pa first 283 Pa last 346.3 P.A. Now (θ) 346.3°
Sep first 8.0 Sep last 4.35 Sep. Now (ρ) 4.35"
Mag pri 4.87 Mag sec 8.85 delta mag (ΔM) 3.98 Spectral class F7V (yellow-white)
Pri motion ra +007 Sec motion ra +004
Pri motion dec -095 Sec motion dec -030
Notes N O (See Notes, Orbital solution)
rPM=0.683
This double is physical.
 
 
09104+6708 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Sig2 UMa 14788 09 10 24 +67 08 03 STF 1306 AB 2020 233 346 4.4 4.87 8.85 3.98 Y <===
Show 14788 09 10 24 +67 08 03 STF 1306 AC 2003 10 148 197.8 4.87 10.32 5.45
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Sig2 UMa Var name NSV4392 UMa Constellation Ursa Major SAO 14788
HIP 45038 Tycho2 4141-01496-1 Gaia DR2 1068982214258617216 HD 78154
HR 3616 GC 12619 ADS 7203 GL Gl 335A
BD BD+67 577 Bayer Sigma 2 Ursae Majoris Bayer name Sig2 UMa Flamsteed 13 Ursae Majoris
Flamsteed name 13 UMa Distance 20.38 Distance ly 66.48 Bayer greek σ2 UMa
 
 
ORBITAL ELEMENTS
 
 
Period (P)920.9005y± 90.7281 Periastron (T)1917.0555y± 0.2205 Semi-major axis (a)5.73856a± 0.40385
Eccentricity (e)0.79257± 0.01527 Inclination (i)144.031°± 1.72 Longitude of periastron (ω)334.501°± 1.122
Node (Ω)105.205°± 1.772 Notesn ReferenceIzm2019
Equinox Last observation2015 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 353.5 3.884
2001 353.0 3.919
2002 352.6 3.953
2003 352.2 3.987
2004 351.8 4.020
2005 351.4 4.054
2006 351.1 4.088
2007 350.7 4.121
2008 350.3 4.154
2009 349.9 4.187
2010 349.6 4.220
2011 349.2 4.253
2012 348.9 4.286
2013 348.5 4.319
2014 348.2 4.351
2015 347.9 4.384
2016 347.5 4.416
2017 347.2 4.448
2018 346.9 4.480
2019 346.6 4.512
2020 346.3 4.544
2021 346.0 4.576
2022 345.7 4.607
2023 345.4 4.638
2024 345.1 4.670
2025 344.8 4.701
2026 344.5 4.732
2027 344.2 4.763
2028 343.9 4.794
2029 343.7 4.824
2030 343.4 4.855


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


 
  


wds09104%2B6708d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic