19169+6312 STF 2509 (HD 181566)

 
 
19h 16m 53.09s +63° 12' 27.0" P.A. 328.00 sep 1.8 mag 7.44,8.17 Sp F6V dist. 78.25 pc (255.25 l.y.)
 
 
Coord 2000 19169+6312 Discov num STF2509 Comp Coord arcsec 2000 19 16 53.09 +63 12 27.0
Date first 1831 Date last 2018 Obs 119
Pa first 351 Pa last 328.4 P.A. Now (θ) 328.4°
Sep first 0.5 Sep last 1.838 Sep. Now (ρ) 1.838"
Mag pri 7.44 Mag sec 8.17 delta mag (ΔM) 0.73 Spectral class F6V (yellow-white)
Pri motion ra +028 Sec motion ra +028
Pri motion dec -021 Sec motion dec -021
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 181566 Constellation Draco SAO 18257 HIP 94760
Tycho2 4221-00314-1 Gaia DR2 2252520509199021696 HD 181566 GC 26632
ADS 12296 BD BD+62 1702 Distance 78.25 Distance ly 255.25
 
 
ORBITAL ELEMENTS
 
 
Period (P)627y Periastron (T)1737y Semi-major axis (a)1.345a
Eccentricity (e)0.75 Inclination (i)101.2° Longitude of periastron (ω)325.4°
Node (Ω)139.6° Notes ReferenceZir2014a
Equinox2000 Last observation2011 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 329.2 1.771
2001 329.1 1.775
2002 329.1 1.780
2003 329.0 1.784
2004 329.0 1.788
2005 329.0 1.793
2006 328.9 1.797
2007 328.9 1.801
2008 328.8 1.806
2009 328.8 1.810
2010 328.7 1.814
2011 328.7 1.818
2012 328.7 1.822
2013 328.6 1.826
2014 328.6 1.831
2015 328.5 1.835
2016 328.5 1.839
2017 328.5 1.843
2018 328.4 1.846
2019 328.4 1.850
2020 328.4 1.854
2021 328.3 1.858
2022 328.3 1.862
2023 328.2 1.865
2024 328.2 1.869
2025 328.2 1.873
2026 328.1 1.877
2027 328.1 1.880
2028 328.0 1.884
2029 328.0 1.887
2030 328.0 1.891


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



 
 


wds19169%2B6312a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic