20205-2749 RST3255

 
 
20h 20m 28.13s -27 49' 28.4" P.A. 356.7 sep 0.15 mag 10.60,10.60 Sp G1/2V
 
 
Coord 2000
20205-2749
Discov num
RST3255
Comp
Coord arcsec 2000
20 20 28.13 -27 49 28.4
Date first
1935
Date last
2018
Obs
9
Pa first
71
Pa last
282
P.A. Now (θ)
356.7°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.15"
Mag pri
10.60
Mag sec
10.60
delta mag (ΔM)
0
Spectral class
G1/2V (yellow)
Pri motion ra
+033
Sec motion ra
Pri motion dec
-006
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
282.1
Precise sep
0.133
Constellation
Sagittarius
SAO
189158
Tycho2
6914-01503-1
Gaia DR2
29538210560
HD
193280
last precise pa
282.1
last precise sep
0.133
 
 
ORBITAL ELEMENTS
 
 
Period (P)45.7y Periastron (T)1951.9y Semi-major axis (a)0.217a
Eccentricity (e)0.16 Inclination (i)55.4° Longitude of periastron (ω)91.9°
Node (Ω)98° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1984
label rho theta
2000 0.127 231.2
2001 0.144 242.6
2002 0.160 251.7
2003 0.176 259.0
2004 0.189 265.3
2005 0.200 270.7
2006 0.208 275.7
2007 0.212 280.4
2008 0.214 285.0
2009 0.214 289.5
2010 0.210 294.1
2011 0.205 299.0
2012 0.198 304.1
2013 0.190 309.6
2014 0.181 315.6
2015 0.172 322.3
2016 0.163 329.7
2017 0.155 337.9
2018 0.149 347.0
2019 0.145 356.7
2020 0.143 6.8
2021 0.144 16.9
2022 0.148 26.7
2023 0.154 35.8
2024 0.162 44.2
2025 0.170 51.8
2026 0.180 58.6
2027 0.189 64.7
2028 0.197 70.3
2029 0.205 75.4
2030 0.211 80.2

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






wds20205-2749a.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
20205-2749 RST3255 1984 7 76 0.1 10.60 10.60 G1/2V NO 202028.13-274928.4
20205-2749 RST3255 2017 8 281 0.1 10.60 10.60 G1/2V O 202028.13-274928.4

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