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Current system
20248-1943
HDS2919


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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20248-1943 HDS2919

 
 
20h 24m 46.66s -19° 42' 35.9" P.A. 256.50 sep 0.1 mag 9.93,10.72 Sp K3V dist. 54.53 pc (177.88 l.y.)
 
 
Coord 2000
20248-1943
 Discov num
HDS2919
 Comp
Coord arcsec 2000
20 24 46.66 -19 42 35.9
Date first
1991
 Date last
2020
 Obs
12
Pa first
66
 Pa last
252
 P.A. Now (θ)
256.5°
Sep first
0.4
 Sep last
0.1
 Sep. Now (ρ)
0.1"
Mag pri
9.93
 Mag sec
10.72
 delta mag (ΔM)
0.79
 Spectral class
K3V (yellow-orange)
Pri motion ra
+043
 Sec motion ra
Pri motion dec
-011
 Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
252.3
 Precise sep
0.1
 Constellation
Capricornus
 SAO
163540
HIP
100685
 Tycho2
6337-01640-1
 Gaia DR2
6860285329861972096
 HD
194169
BD
BD-20 5925
 Distance
54.53
 Distance ly
177.88
 last precise pa
252.3
last precise sep
0.1
 
 
ORBITAL ELEMENTS
 
 
Period (P)44.88y± 1.47 Periastron (T)2020.99y± 0.08 Semi-major axis (a)0.265a± 0.003
Eccentricity (e)0.625± 0.009 Inclination (i)53.6°± 1.5 Longitude of periastron (ω)183.5°± 4.4
Node (Ω)74.2°± 1.6 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2021
label rho theta
2000 0.427 78.3
2001 0.423 79.8
2002 0.418 81.3
2003 0.410 82.8
2004 0.401 84.4
2005 0.390 86.0
2006 0.377 87.8
2007 0.363 89.7
2008 0.346 91.8
2009 0.328 94.1
2010 0.307 96.7
2011 0.285 99.6
2012 0.261 103.2
2013 0.234 107.4
2014 0.206 112.8
2015 0.177 119.9
2016 0.147 130.0
2017 0.119 145.0
2018 0.097 167.9
2019 0.090 198.7
2020 0.096 229.6
2021 0.099 256.5
2022 0.090 285.2
2023 0.085 320.3
2024 0.098 352.8
2025 0.126 14.2
2026 0.157 27.4
2027 0.190 36.2
2028 0.220 42.4
2029 0.249 47.1
2030 0.275 50.9


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


 
  


wds20248-1943b.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
20248-1943 HDS2919 1997 3 79 0.4 9.93 10.72 K3V D 202446.66-194235.9
20248-1943 HDS2919 2007 4 92 0.3 9.93 10.72 K3V D 202446.66-194235.9
20248-1943 HDS2919 2013 6 111 0.2 9.93 10.72 K3V 202446.66-194235.9
20248-1943 HDS2919 2014 7 119 0.2 9.93 10.72 K3V 202446.66-194235.9
20248-1943 HDS2919 2015 8 125 0.2 9.93 10.72 K3V 202446.66-194235.9
20248-1943 HDS2919 2017 9 155 0.1 9.93 10.72 K3V O 202446.66-194235.9
20248-1943 HDS2919 2018 10 179 0.1 9.93 10.72 K3V O 202446.66-194235.9
20248-1943 HDS2919 2019 11 215 0.1 9.93 10.72 K3V O 202446.66-194235.9

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