20519+0544 A 613 (HD 198684)

 
 
20h 51m 54.49s +05° 44' 29.5" P.A. 324.00 sep 0.7 mag 9.10,9.03 Sp F5
 
 
Coord 2000 20519+0544 Discov num A   613 Comp Coord arcsec 2000 20 51 54.49 +05 44 29.5
Date first 1903 Date last 2018 Obs 57
Pa first 9 Pa last 324.1 P.A. Now (θ) 324.1°
Sep first 0.8 Sep last 0.73 Sep. Now (ρ) 0.73"
Mag pri 9.10 Mag sec 9.03 delta mag (ΔM) 0.07 Spectral class F5 (yellow-white)
Pri motion ra +075 Sec motion ra +075
Pri motion dec -004 Sec motion dec -004
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 198684 Constellation Delphinus SAO 126304 Tycho2 0524-01786-1
Gaia DR2 1735730806984435712 HD 198684 ADS 14368
 
 
ORBITAL ELEMENTS
 
 
Period (P)695y Periastron (T)2605y Semi-major axis (a)1.05a
Eccentricity (e)0.227 Inclination (i)118° Longitude of periastron (ω)160.8°
Node (Ω)178.4° Notes ReferenceUSN2002
Equinox2000 Last observation1996 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 329.0 0.678
2001 328.4 0.674
2002 327.8 0.670
2003 327.2 0.666
2004 326.7 0.662
2005 326.1 0.658
2006 325.4 0.653
2007 324.8 0.649
2008 324.2 0.645
2009 323.6 0.641
2010 322.9 0.637
2011 322.3 0.633
2012 321.6 0.629
2013 321.0 0.625
2014 320.3 0.621
2015 319.6 0.618
2016 318.9 0.614
2017 318.2 0.610
2018 317.5 0.606
2019 316.8 0.602
2020 316.1 0.598
2021 315.4 0.594
2022 314.6 0.591
2023 313.9 0.587
2024 313.1 0.583
2025 312.3 0.580
2026 311.5 0.576
2027 310.8 0.573
2028 309.9 0.569
2029 309.1 0.566
2030 308.3 0.562


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



 
 


wds20519%2B0544a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic