18002+8000 STF 2308 AB (41 Dra)

18h 00m 09.07s +80° 00' 13.7" P.A. 232.00 sep 18.9 mag 5.70,6.00 Sp F7V+F7V dist. 63.53 pc (207.23 l.y.)

Coord 2000 18002+8000 Discov num STF2308 Comp AB Coord arcsec 2000 18 00 09.07 +80 00 13.7
Date first 1782 Date last 2022 Obs 184
Pa first 235 Pa last 232 P.A. Now (θ) 232°
Sep first 20.7 Sep last 18.9 Sep. Now (ρ) 18.9"
Mag pri 5.70 Mag sec 6.00 delta mag (ΔM) 0.3 Spectral class F7V+F7V (yellow-white/yellow-white)
Pri motion ra +047 Sec motion ra +055
Pri motion dec +124 Sec motion dec +131
Notes N O V (See Notes, Orbital solution, Proper motion indicates physical)




rPM=0.075 (< 0.3, Physical double)

This double is physical.



18002+8000 SYSTEM COMPONENTS

Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 8996 18 00 09 +80 00 14 BAG 6 Aa,Ab 2012 31 316 0.1 6.22 6.69 0.47 Y
Show 41 Dra 8996 18 00 09 +80 00 14 STF 2308 AB 2022 184 232 18.9 5.70 6.00 0.30 Y <===
Show 8996 18 00 09 +80 00 14 STF 2308 AC 2017 17 129 225.3 5.70 8.34 2.64


Quadruple system
3 estimated visually detectable stars in this system



OTHER CATALOGS AND DESIGNATIONS

Name 41 Dra Var name NSV10205 Dra Constellation Draco SAO 8996
HIP 88136 Tycho2 4578-01433-1 Gaia DR2 2294405824838599808 HD 166866
HR 6810 GC 24669 ADS 11061 BD BD+79 571
Flamsteed 41 Draconis Flamsteed name 41 Dra Distance 63.53 Distance ly 207.23




ORBITAL ELEMENTS

Period (P)18000y Periastron (T)3381y Semi-major axis (a)24.74a
Eccentricity (e)0.84 Inclination (i)162° Longitude of periastron (ω)138°
Node (Ω)233° Notesn ReferenceKis1996
Equinox2000 Last observation Grade5(1=Definitive, 9=Indet.)

label theta rho
2000 232.2 18.959
2001 232.2 18.950
2002 232.2 18.941
2003 232.1 18.932
2004 232.1 18.923
2005 232.1 18.913
2006 232.1 18.904
2007 232.1 18.895
2008 232.1 18.886
2009 232.0 18.877
2010 232.0 18.868
2011 232.0 18.859
2012 232.0 18.849
2013 232.0 18.840
2014 231.9 18.831
2015 231.9 18.822
2016 231.9 18.813
2017 231.9 18.804
2018 231.9 18.795
2019 231.9 18.785
2020 231.8 18.776
2021 231.8 18.767
2022 231.8 18.758
2023 231.8 18.749
2024 231.8 18.740
2025 231.7 18.730
2026 231.7 18.721
2027 231.7 18.712
2028 231.7 18.703
2029 231.7 18.694
2030 231.7 18.684


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



 
 


wds18002%2B8000b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic