20057-3743 HDS2865

 
 
20h 05m 41.20s -37 42' 53.2" P.A. 232 sep 0.09 mag 8.53,9.11 Sp F3V dist. 149.03 pc (486.14 l.y.)
 
 
Coord 2000
20057-3743
Discov num
HDS2865
Comp
Coord arcsec 2000
20 05 41.20 -37 42 53.2
Date first
1991
Date last
2017
Obs
6
Pa first
51
Pa last
239
P.A. Now (θ)
232°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.09"
Mag pri
8.53
Mag sec
9.11
delta mag (ΔM)
0.58
Spectral class
F3V (yellow-white)
Pri motion ra
+017
Sec motion ra
Pri motion dec
-007
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
239.2
Precise sep
0.087
Constellation
Sagittarius
HIP
98979
HD
190289
Distance
149.03
Distance ly
486.14
last precise pa
239.2
last precise sep
0.087
 
 
ORBITAL ELEMENTS
 
 
Period (P)50y Periastron (T)2018.71y± 0.56 Semi-major axis (a)0.1778a± 0.0043
Eccentricity (e)0.328± 0.04 Inclination (i)131.5°± 4.2 Longitude of periastron (ω)131.7°± 6.6
Node (Ω)4.2°± 3.7 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.216 20.1
2001 0.216 17.1
2002 0.214 14.0
2003 0.212 10.9
2004 0.208 7.6
2005 0.203 4.3
2006 0.197 0.7
2007 0.189 356.9
2008 0.179 352.6
2009 0.168 347.9
2010 0.156 342.5
2011 0.142 336.1
2012 0.128 328.3
2013 0.113 318.4
2014 0.100 305.8
2015 0.089 289.7
2016 0.084 270.5
2017 0.085 250.3
2018 0.092 232.0
2019 0.102 216.8
2020 0.113 204.4
2021 0.122 194.1
2022 0.130 185.2
2023 0.134 177.0
2024 0.137 169.3
2025 0.138 161.8
2026 0.138 154.3
2027 0.137 146.7
2028 0.135 139.0
2029 0.134 131.1
2030 0.133 123.2

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

grafico orbita





wds20057-3743a.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
20057-3743 HDS2865 1991 1 51 0.2 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2008 2 170 0.2 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2014 3 293 0.1 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2015 5 276 0.1 8.53 9.11 F3V 200541.20-374253.2
20057-3743 HDS2865 2017 6 239 0.1 8.53 9.11 F3V O 200541.20-374253.2

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