21080+0509 STT 527 (HD 201221)

 
 
21h 08m 00.68s +05° 09' 06.0" P.A. 114.00 sep 0.4 mag 7.14,8.14 Sp A2V dist. 219.78 pc (716.92 l.y.)
 
 
Coord 2000 21080+0509 Discov num STT 527 Comp Coord arcsec 2000 21 08 00.68 +05 09 06.0
Date first 1846 Date last 2016 Obs 84
Pa first 297 Pa last 113.9 P.A. Now (θ) 113.9°
Sep first 0.3 Sep last 0.416 Sep. Now (ρ) 0.416"
Mag pri 7.14 Mag sec 8.14 delta mag (ΔM) 1 Spectral class A2V (white)
Pri motion ra -016 Sec motion ra
Pri motion dec -010 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 201221 Constellation Equuleus SAO 126562 HIP 104324
Tycho2 0535-02156-1 Gaia DR2 1733031127982160640 HD 201221 GC 29538
ADS 14666 BD BD+04 4615 Distance 219.78 Distance ly 716.92
 
 
ORBITAL ELEMENTS
 
 
Period (P)561.15y Periastron (T)1950.18y Semi-major axis (a)0.5576a
Eccentricity (e)0.4192 Inclination (i)117.09° Longitude of periastron (ω)240.24°
Node (Ω)91.3° Notes ReferencePop1995d
Equinox2000 Last observation1987 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 117.3 0.310
2001 116.5 0.317
2002 115.7 0.323
2003 114.9 0.329
2004 114.1 0.335
2005 113.4 0.341
2006 112.7 0.346
2007 112.0 0.352
2008 111.4 0.358
2009 110.7 0.364
2010 110.1 0.370
2011 109.5 0.375
2012 109.0 0.381
2013 108.4 0.386
2014 107.9 0.392
2015 107.3 0.397
2016 106.8 0.403
2017 106.3 0.408
2018 105.8 0.413
2019 105.3 0.418
2020 104.9 0.423
2021 104.4 0.428
2022 104.0 0.433
2023 103.5 0.438
2024 103.1 0.443
2025 102.7 0.448
2026 102.3 0.453
2027 101.9 0.457
2028 101.5 0.462
2029 101.1 0.466
2030 100.7 0.471
2031 100.4 0.475
2032 100.0 0.480
2033 99.7 0.484
2034 99.3 0.488
2035 99.0 0.492
2036 98.6 0.496
2037 98.3 0.500
2038 98.0 0.504
2039 97.7 0.508
2040 97.3 0.512
2041 97.0 0.516
2042 96.7 0.519
2043 96.4 0.523
2044 96.1 0.526
2045 95.8 0.530
2046 95.5 0.533
2047 95.2 0.537
2048 95.0 0.540
2049 94.7 0.543
2050 94.4 0.547


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



 
 


wds21080%2B0509a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic