21115+2144 COU 227

 
 
21h 11m 28.93s +21° 44' 01.0" P.A. 124.00 sep 0.5 mag 10.05,11.77 Sp K2 dist. 76.57 pc (249.77 l.y.)
 
 
Coord 2000 21115+2144 Discov num COU 227 Comp Coord arcsec 2000 21 11 28.93 +21 44 01.0
Date first 1967 Date last 2015 Obs 24
Pa first 26 Pa last 123.8 P.A. Now (θ) 121.7°
Sep first 0.5 Sep last 0.527 Sep. Now (ρ) 0.498"
Mag pri 10.05 Mag sec 11.77 delta mag (ΔM) 1.72 Spectral class K2 (yellow-orange)
Pri motion ra -082 Sec motion ra
Pri motion dec -053 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Vulpecula HIP 104612 Gaia DR2 1790160790089380736 BD BD+21 4489
Distance 76.57 Distance ly 249.77
 
 
ORBITAL ELEMENTS
 
 
Period (P)198.66y Periastron (T)2031.7y Semi-major axis (a)0.669a
Eccentricity (e)0.299 Inclination (i)52.9° Longitude of periastron (ω)44.5°
Node (Ω)126.3° Notes ReferenceFMR2012b
Equinox2000 Last observation2010 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 93.5 0.499
2001 95.4 0.502
2002 97.2 0.505
2003 99.1 0.508
2004 100.9 0.510
2005 102.6 0.513
2006 104.4 0.515
2007 106.2 0.517
2008 107.9 0.518
2009 109.6 0.519
2010 111.4 0.519
2011 113.1 0.519
2012 114.8 0.519
2013 116.6 0.518
2014 118.3 0.516
2015 120.1 0.514
2016 121.9 0.512
2017 123.6 0.508
2018 125.5 0.504
2019 127.3 0.499
2020 129.2 0.494
2021 131.2 0.488
2022 133.1 0.481
2023 135.2 0.474
2024 137.3 0.466
2025 139.5 0.458
2026 141.8 0.448
2027 144.1 0.439
2028 146.6 0.429
2029 149.2 0.418
2030 152.0 0.408
2031 154.8 0.397
2032 157.9 0.386
2033 161.1 0.375
2034 164.6 0.364
2035 168.2 0.353
2036 172.0 0.343
2037 176.1 0.334
2038 180.4 0.325
2039 184.9 0.318
2040 189.6 0.312
2041 194.5 0.307
2042 199.5 0.303
2043 204.6 0.302
2044 209.8 0.302
2045 214.9 0.303
2046 219.9 0.306
2047 224.8 0.311
2048 229.6 0.317
2049 234.1 0.325
2050 238.4 0.334


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds21115%2B2144a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic