19394+2215 STF 2556 (HD 185661)

 
 
19h 39m 26.31s +22 15' 23.4" P.A. 334.00 sep 0.4 mag 7.71,8.92 Sp F4IV dist. 147.28 pc (480.43 l.y.)
 
 
Coord 2000 19394+2215 Discov num STF2556 Comp Coord arcsec 2000 19 39 26.31 +22 15 23.4
Date first 1829 Date last 2018 Obs 203
Pa first 188 Pa last 334.4 P.A. Now (θ) 334.4°
Sep first 0.6 Sep last 0.421 Sep. Now (ρ) 0.421"
Mag pri 7.71 Mag sec 8.92 delta mag (ΔM) 1.21 Spectral class F4IV (yellow-white)
Pri motion ra +003 Sec motion ra +003
Pri motion dec +013 Sec motion dec +013
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 185661 Constellation Vulpecula SAO 87508 HIP 96691
Tycho2 1614-00138-1 HD 185661 GC 27199 ADS 12752
BD BD+21 3862 Distance 147.28 Distance ly 480.43
 
 
ORBITAL ELEMENTS
 
 
Period (P)622.4y Periastron (T)1970.31y Semi-major axis (a)0.678a
Eccentricity (e)0.476 Inclination (i)140.9° Longitude of periastron (ω)356°
Node (Ω)44.5° Notes ReferenceAri1999
Equinox2000 Last observation1997 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 5.3 0.358
2001 3.8 0.358
2002 2.4 0.359
2003 1.0 0.359
2004 359.6 0.359
2005 358.2 0.360
2006 356.8 0.360
2007 355.4 0.361
2008 354.0 0.362
2009 352.6 0.363
2010 351.3 0.363
2011 349.9 0.364
2012 348.5 0.365
2013 347.2 0.366
2014 345.8 0.367
2015 344.5 0.368
2016 343.2 0.370
2017 341.8 0.371
2018 340.5 0.372
2019 339.2 0.374
2020 337.9 0.375
2021 336.6 0.377
2022 335.4 0.379
2023 334.1 0.380
2024 332.9 0.382
2025 331.6 0.384
2026 330.4 0.386
2027 329.2 0.388
2028 328.0 0.390
2029 326.8 0.392
2030 325.6 0.395


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



 
 


wds19394%2B2215a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic