21176+8231 STF 2807 (HD 204372)

 
 
21h 17m 33.47s +82° 31' 03.7" P.A. 310.00 sep 1.8 mag 8.65,8.77 Sp F8 dist. 75.02 pc (244.72 l.y.)
 
 
Coord 2000 21176+8231 Discov num STF2807 Comp Coord arcsec 2000 21 17 33.47 +82 31 03.7
Date first 1829 Date last 2019 Obs 46
Pa first 315 Pa last 309.5 P.A. Now (θ) 309.5°
Sep first 1.9 Sep last 1.785 Sep. Now (ρ) 1.785"
Mag pri 8.65 Mag sec 8.77 delta mag (ΔM) 0.12 Spectral class F8 (yellow-white)
Pri motion ra +012 Sec motion ra +012
Pri motion dec +082 Sec motion dec +082
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 204372 Constellation Cepheus SAO 3550 HIP 105112
Tycho2 4649-00045-1 Gaia DR2 2298698382656425216 HD 204372 GC 29930
ADS 14921 BD BD+81 737 Distance 75.02 Distance ly 244.72
 
 
ORBITAL ELEMENTS
 
 
Period (P)2818.9854y± 1456.9941 Periastron (T)1641.0222y± 501.3932 Semi-major axis (a)6.15221a± 4.16702
Eccentricity (e)0.80384± 0.1589 Inclination (i)91.733°± 3.879 Longitude of periastron (ω)108.438°± 25.004
Node (Ω)136.406°± 5.633 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 310.7 1.851
2001 310.7 1.847
2002 310.7 1.842
2003 310.7 1.838
2004 310.6 1.833
2005 310.6 1.829
2006 310.6 1.825
2007 310.6 1.820
2008 310.5 1.816
2009 310.5 1.811
2010 310.5 1.807
2011 310.5 1.802
2012 310.4 1.798
2013 310.4 1.793
2014 310.4 1.789
2015 310.3 1.784
2016 310.3 1.780
2017 310.3 1.775
2018 310.3 1.770
2019 310.2 1.766
2020 310.2 1.761
2021 310.2 1.757
2022 310.2 1.752
2023 310.1 1.748
2024 310.1 1.743
2025 310.1 1.738
2026 310.0 1.734
2027 310.0 1.729
2028 310.0 1.725
2029 310.0 1.720
2030 309.9 1.715


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



 
 


wds21176%2B8231a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic