20210+4437 A 725

 
 
20h 20m 57.88s +44 36' 29.7" P.A. 25.00 sep 0.9 mag 9.46,10.23 Sp K0 dist. 47.57 pc (155.17 l.y.)
 
 
Coord 2000 20210+4437 Discov num A   725 Comp Coord arcsec 2000 20 20 57.88 +44 36 29.7
Date first 1904 Date last 2017 Obs 41
Pa first 50 Pa last 25.1 P.A. Now (θ) 25.1°
Sep first 1.0 Sep last 0.878 Sep. Now (ρ) 0.878"
Mag pri 9.46 Mag sec 10.23 delta mag (ΔM) 0.77 Spectral class K0 (yellow-orange)
Pri motion ra -145 Sec motion ra
Pri motion dec +049 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Cygnus HIP 100341 Tycho2 3164-00048-1 Gaia DR2 2081388160068434048
ADS 13744 BD BD+44 3436 Distance 47.57 Distance ly 155.17
 
 
ORBITAL ELEMENTS
 
 
Period (P)166.85y± 7.08 Periastron (T)1959.85y± 0.97 Semi-major axis (a)0.715a± 0.021
Eccentricity (e)0.494± 0.021 Inclination (i)65.7°± 1.7 Longitude of periastron (ω)341.4°± 2.5
Node (Ω)226.4°± 0.9 Notesn ReferenceHrt2009
Equinox Last observation2006 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 9.9 0.515
2001 11.3 0.532
2002 12.7 0.550
2003 13.9 0.567
2004 15.1 0.585
2005 16.3 0.602
2006 17.3 0.618
2007 18.3 0.635
2008 19.3 0.651
2009 20.2 0.667
2010 21.0 0.683
2011 21.9 0.699
2012 22.7 0.714
2013 23.4 0.729
2014 24.2 0.744
2015 24.9 0.758
2016 25.5 0.772
2017 26.2 0.786
2018 26.8 0.799
2019 27.4 0.812
2020 28.0 0.825
2021 28.6 0.838
2022 29.1 0.850
2023 29.7 0.861
2024 30.2 0.873
2025 30.7 0.884
2026 31.2 0.895
2027 31.7 0.905
2028 32.2 0.915
2029 32.6 0.925
2030 33.1 0.934


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



 
 


wds20210%2B4437a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic