20267-4334 I  1420

 
 
20h 26m 44.38s -43 33' 56.4" P.A. 0.30 sep 0.3 mag 9.38,9.61 Sp K0V dist. 45.54 pc (148.55 l.y.)
 
 
Coord 2000
20267-4334
Discov num
I  1420
Comp
Coord arcsec 2000
20 26 44.38 -43 33 56.4
Date first
1925
Date last
2019
Obs
25
Pa first
344
Pa last
358
P.A. Now (θ)
0.3°
Sep first
0.7
Sep last
0.3
Sep. Now (ρ)
0.28"
Mag pri
9.38
Mag sec
9.61
delta mag (ΔM)
0.23
Spectral class
K0V (yellow-orange)
Pri motion ra
+120
Sec motion ra
Pri motion dec
-114
Sec motion dec
Notes
O (Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
358.3
Precise sep
0.302
Constellation
Sagittarius
SAO
230207
HIP
100836
Tycho2
7961-01417-1
Gaia DR2
45511522048
HD
194327
CD
CD-4313984
CP
CP-43 9228
Distance
45.54
Distance ly
148.55
last precise pa
358.3
last precise sep
0.302
 
 
ORBITAL ELEMENTS
 
 
Period (P)77.81y Periastron (T)1981.04y Semi-major axis (a)0.446a
Eccentricity (e)0.336 Inclination (i)79.3° Longitude of periastron (ω)61.6°
Node (Ω)159.3° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2018
label rho theta
2000 0.485 340.4
2001 0.492 341.1
2002 0.496 341.7
2003 0.498 342.4
2004 0.498 343.0
2005 0.496 343.7
2006 0.492 344.3
2007 0.487 345.0
2008 0.480 345.7
2009 0.471 346.4
2010 0.461 347.1
2011 0.450 347.9
2012 0.437 348.7
2013 0.423 349.6
2014 0.408 350.5
2015 0.392 351.5
2016 0.375 352.6
2017 0.357 353.8
2018 0.338 355.2
2019 0.319 356.7
2020 0.299 358.4
2021 0.278 0.3
2022 0.257 2.5
2023 0.236 5.2
2024 0.214 8.4
2025 0.193 12.3
2026 0.172 17.1
2027 0.153 23.2
2028 0.135 31.0
2029 0.120 41.0
2030 0.110 53.2

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






wds20267-4334b.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
20267-4334 I 1420 1991 20 152 0.3 9.38 9.61 K0V OD 202644.38-433356.4
20267-4334 I 1420 2008 21 346 0.5 9.38 9.61 K0V OD 202644.38-433356.4
20267-4334 I 1420 2010 22 347 0.4 9.38 9.61 K0V OD 202644.38-433356.4
20267-4334 I 1420 2017 23 355 0.3 9.38 9.61 K0V O 202644.38-433356.4
20267-4334 I 1420 2018 24 356 0.3 9.38 9.61 K0V O 202644.38-433356.4
20267-4334 I 1420 2019 25 358 0.3 9.38 9.61 K0V O 202644.38-433356.4

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