20239-4225 BU 763 AB (Kap2 Sgr)

 
 
20h 23m 53.17s -42 25' 22.2" P.A. 180.00 sep 0.5 mag 5.67,7.25 Sp A5V dist. 95.51 pc (311.55 l.y.)
 
 
Coord 2000 20239-4225 Discov num BU  763 Comp AB Coord arcsec 2000 20 23 53.17 -42 25 22.2
Date first 1874 Date last 2021 Obs 55
Pa first 225 Pa last 179.7 P.A. Now (θ) 182.8°
Sep first 1.5 Sep last 0.488 Sep. Now (ρ) 0.529"
Mag pri 5.67 Mag sec 7.25 delta mag (ΔM) 1.58 Spectral class A5V (white)
Pri motion ra -006 Sec motion ra -006
Pri motion dec +024 Sec motion dec +024
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
20239-4225 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Kap2 Sgr 230184 20 23 53 -42 25 22 BU 763 AB 2021 55 180 0.5 5.67 7.25 1.58 Y <===
Show 230184 20 23 53 -42 25 22 I 1626 AC 1998 2 268 18.6 5.67 14.30 8.63
Show 230184 20 23 53 -42 25 22 SEE 511 AD 2000 4 219 29.8 5.67 14.00 8.33
Quadruple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Kap2 Sgr Constellation Sagittarius SAO 230184 HIP 100591
Tycho2 7957-01410-1 Gaia DR2 6679362821813065856 HD 193807 HR 7787
GC 28341 CD CD-4214847 CP CP-42 9068 Bayer Kappa 2 Sagittarii
Bayer name Kap2 Sgr Distance 95.51 Distance ly 311.55 Bayer greek κ2 Sgr
 
 
ORBITAL ELEMENTS
 
 
Period (P)180.2y± 2.7 Periastron (T)2003.82y± 0.09 Semi-major axis (a)0.609a± 0.006
Eccentricity (e)0.806± 0.003 Inclination (i)32.1°± 1.2 Longitude of periastron (ω)181.8°± 1.9
Node (Ω)216.3°± 1.7 Notesn ReferenceTok2021f
Equinox2000 Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 316.7 0.165
2001 332.3 0.145
2002 352.3 0.129
2003 16.3 0.121
2004 42.6 0.118
2005 68.7 0.122
2006 91.9 0.133
2007 110.5 0.151
2008 124.8 0.173
2009 135.6 0.199
2010 144.0 0.225
2011 150.5 0.251
2012 155.9 0.278
2013 160.3 0.304
2014 164.0 0.329
2015 167.1 0.354
2016 169.9 0.378
2017 172.4 0.402
2018 174.5 0.424
2019 176.5 0.447
2020 178.3 0.468
2021 179.9 0.489
2022 181.4 0.509
2023 182.8 0.529
2024 184.1 0.548
2025 185.2 0.567
2026 186.4 0.585
2027 187.4 0.603
2028 188.4 0.620
2029 189.4 0.637
2030 190.2 0.653


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



 
 


wds20239-4225b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic