21308+4827 A 770 AB

 
 
21h 30m 48.00s +48° 27' 25.4" P.A. 143.00 sep 0.1 mag 7.99,7.99 Sp K0
 
 
Coord 2000 21308+4827 Discov num A   770 Comp AB Coord arcsec 2000 21 30 48.00 +48 27 25.4
Date first 1928 Date last 2018 Obs 10
Pa first 326 Pa last 142.7 P.A. Now (θ) 142.7°
Sep first 0.3 Sep last 0.135 Sep. Now (ρ) 0.135"
Mag pri 7.99 Mag sec 7.99 delta mag (ΔM) 0 Spectral class K0 (yellow-orange)
Pri motion ra +018 Sec motion ra
Pri motion dec -142 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
21308+4827 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 21 30 48 +48 27 25 A 770 AB 2018 10 143 0.1 7.99 7.99 0.00 Y <===
Show 21 30 48 +48 27 25 A 770 AB,C 2018 13 317 1.1 8.74 11.90 3.16
Show 21 30 48 +48 27 25 A 770 AB,D 2017 11 15 98.9 8.74 10.59 1.85
Show 21 30 50 +48 28 59 A 770 DE 2015 11 41 7.2 10.59 12.00 1.41
Quintuple system
6 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Cygnus Tycho2 3594-01084-1 Gaia DR2 1978557468965457408 ADS 15052
 
 
ORBITAL ELEMENTS
 
 
Period (P)146y Periastron (T)1958.6y Semi-major axis (a)0.307a
Eccentricity (e)0.2 Inclination (i)89.5° Longitude of periastron (ω)90°
Node (Ω)321.4° Notesn ReferenceTok2019e
Equinox2000 Last observation2018 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 141.7 0.278
2001 141.7 0.273
2002 141.8 0.268
2003 141.8 0.262
2004 141.8 0.256
2005 141.9 0.250
2006 141.9 0.243
2007 141.9 0.236
2008 142.0 0.229
2009 142.0 0.221
2010 142.1 0.213
2011 142.1 0.205
2012 142.1 0.197
2013 142.2 0.188
2014 142.3 0.179
2015 142.3 0.170
2016 142.4 0.161
2017 142.5 0.151
2018 142.6 0.142
2019 142.7 0.132
2020 142.8 0.122
2021 142.9 0.112
2022 143.1 0.102
2023 143.3 0.092
2024 143.6 0.081
2025 143.9 0.071
2026 144.4 0.060
2027 145.1 0.050
2028 146.1 0.039
2029 147.9 0.028
2030 151.9 0.018


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



 
 


wds21308%2B4827a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic