20239-4225 BU  763AB (Kap2 Sgr)

 
 
20h 23m 53.17s -42 25' 22.2" P.A. 352.8 sep 0.43 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
2017
Obs
54
Pa first
225
Pa last
174
P.A. Now (θ)
352.8°
Sep first
1.5
Sep last
0.4
Sep. Now (ρ)
0.43"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Kap2 Sgr 230184 20239-4225 BU 763 AB 1874 2017 54 353 0.4 5.67 7.25 1.58 Y <===
Show 20239-4225 I 1626 AC 1925 1998 2 268 18.6 5.67 14.30 8.63
Show 20239-4225 SEE 511 AD 1897 2000 4 219 29.8 5.67 14.00 8.33
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
174
Precise sep
0.414
Name
Kap2 Sgr
Constellation
Sagittarius
SAO
230184
HIP
100591
Tycho2
7957-01410-1
Gaia DR2
21813065856
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
last precise pa
174
last precise sep
0.414
 
 
ORBITAL ELEMENTS
 
 
Period (P)700y Periastron (T)1912y Semi-major axis (a)2.032a
Eccentricity (e)0.401 Inclination (i)80° Longitude of periastron (ω)177.3°
Node (Ω)40.7° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation1992
label rho theta
2000 0.307 295.1
2001 0.304 298.8
2002 0.302 302.4
2003 0.301 306.2
2004 0.302 309.9
2005 0.303 313.6
2006 0.306 317.2
2007 0.310 320.8
2008 0.316 324.2
2009 0.322 327.6
2010 0.329 330.7
2011 0.337 333.8
2012 0.346 336.7
2013 0.356 339.4
2014 0.367 342.0
2015 0.378 344.4
2016 0.390 346.7
2017 0.403 348.9
2018 0.415 350.9
2019 0.429 352.8
2020 0.443 354.6
2021 0.457 356.2
2022 0.471 357.8
2023 0.486 359.3
2024 0.501 0.7
2025 0.516 2.0
2026 0.531 3.2
2027 0.547 4.4
2028 0.563 5.5
2029 0.579 6.5
2030 0.595 7.5

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






wds20239-4225a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20239-4225 BU 763 AB 1992 47 268 0.4 5.93 7.25 A5V NOD 202353.19-422522.5
20239-4225 BU 763 AB 2008 48 317 0.2 5.93 7.25 A5V NOD 202353.19-422522.5
20239-4225 BU 763 AB 2013 50 345 0.3 5.67 7.25 A5V NO 202353.17-422522.2
20239-4225 BU 763 AB 2016 53 352 0.4 5.67 7.25 A5V NO 202353.17-422522.2
20239-4225 BU 763 AB 2017 54 174 0.4 5.67 7.25 A5V NO 202353.17-422522.2

If you need more information about this double, apply for a data request form to the WDS.