21251+0923 BU 164 AB

 
 
21h 25m 05.66s +09° 23' 02.6" P.A. 93.00 sep 0.1 mag 8.17,8.30 Sp A5IV-V dist. 136.05 pc (443.8 l.y.)
 
 
Coord 2000 21251+0923 Discov num BU  164 Comp AB Coord arcsec 2000 21 25 05.66 +09 23 02.6
Date first 1873 Date last 2021 Obs 72
Pa first 255 Pa last 93.4 P.A. Now (θ) 93.4°
Sep first 0.7 Sep last 0.127 Sep. Now (ρ) 0.127"
Mag pri 8.17 Mag sec 8.30 delta mag (ΔM) 0.13 Spectral class A5IV-V (white)
Pri motion ra +023 Sec motion ra
Pri motion dec +006 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
21251+0923 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 126783 21 25 06 +09 23 03 BU 164 AB 2021 72 93 0.1 8.17 8.30 0.13 Y <===
Show HD 203943 126783 21 25 06 +09 23 03 STF 2793 AB,C 2014 59 241 26.4 7.44 8.98 1.54
Triple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Equuleus SAO 126783 HIP 105747 Tycho2 1110-02259-1
Gaia DR2 1742076603985458304 HD 203943 GC 29991 ADS 14954
BD BD+08 4671 Distance 136.05 Distance ly 443.8
 
 
ORBITAL ELEMENTS
 
 
Period (P)361.54y Periastron (T)2023.74y Semi-major axis (a)0.555a
Eccentricity (e)0.875 Inclination (i)104.5° Longitude of periastron (ω)47.7°
Node (Ω)79.3° Notesn ReferenceZir2010
Equinox2000 Last observation2008 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 179.3 0.101
2001 175.6 0.097
2002 171.5 0.094
2003 167.1 0.091
2004 162.5 0.088
2005 157.6 0.086
2006 152.6 0.085
2007 147.4 0.084
2008 142.1 0.084
2009 136.8 0.084
2010 131.6 0.085
2011 126.5 0.086
2012 121.6 0.088
2013 116.8 0.090
2014 112.3 0.092
2015 108.0 0.094
2016 103.9 0.096
2017 99.9 0.098
2018 96.1 0.099
2019 92.3 0.099
2020 88.4 0.097
2021 84.2 0.092
2022 79.3 0.082
2023 72.5 0.065
2024 59.1 0.042
2025 11.6 0.021
2026 300.2 0.033
2027 281.1 0.060
2028 274.1 0.087
2029 270.3 0.113
2030 267.9 0.136


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



 
 


wds21251%2B0923a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic