17562+3926 BU 417 (HD 163789)

 
 
17h 56m 12.06s +39° 26' 20.8" P.A. 317.00 sep 1.0 mag 8.28,10.08 Sp G0 dist. 93.55 pc (305.16 l.y.)
 
 
Coord 2000 17562+3926 Discov num BU  417 Comp Coord arcsec 2000 17 56 12.06 +39 26 20.8
Date first 1877 Date last 2016 Obs 36
Pa first 270 Pa last 316.5 P.A. Now (θ) 316.5°
Sep first 1.6 Sep last 0.99 Sep. Now (ρ) 0.99"
Mag pri 8.28 Mag sec 10.08 delta mag (ΔM) 1.8 Spectral class G0 (yellow)
Pri motion ra +086 Sec motion ra +086
Pri motion dec -047 Sec motion dec -047
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 163789 Constellation Hercules SAO 66487 HIP 87802
Tycho2 3093-01857-1 Gaia DR2 4611031534137064832 HD 163789 ADS 10911
BD BD+39 3274 Distance 93.55 Distance ly 305.16
 
 
ORBITAL ELEMENTS
 
 
Period (P)938.7625y± 483.7501 Periastron (T)2043.974y± 13.6771 Semi-major axis (a)2.59639a± 1.2814
Eccentricity (e)0.85587± 0.12011 Inclination (i)63.553°± 12.49 Longitude of periastron (ω)258.543°± 9.447
Node (Ω)155.636°± 16.497 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 308.6 1.068
2001 309.2 1.060
2002 309.7 1.051
2003 310.2 1.042
2004 310.8 1.034
2005 311.4 1.024
2006 311.9 1.015
2007 312.5 1.005
2008 313.1 0.995
2009 313.7 0.985
2010 314.3 0.975
2011 315.0 0.964
2012 315.6 0.953
2013 316.3 0.941
2014 317.0 0.929
2015 317.7 0.917
2016 318.4 0.904
2017 319.1 0.891
2018 319.9 0.877
2019 320.7 0.863
2020 321.5 0.848
2021 322.3 0.833
2022 323.2 0.817
2023 324.1 0.800
2024 325.1 0.783
2025 326.1 0.764
2026 327.1 0.745
2027 328.2 0.725
2028 329.4 0.704
2029 330.6 0.681
2030 331.9 0.657


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



 
 


wds17562%2B3926a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic