20217-3637 HDS2908

 
 
20h 21m 43.04s -36 36' 35.9" P.A. 310.4 sep 0.03 mag 8.25,8.45 Sp G0/G1V dist. 59.38 pc (193.7 l.y.)
 
 
Coord 2000
20217-3637
Discov num
HDS2908
Comp
Coord arcsec 2000
20 21 43.04 -36 36 35.9
Date first
1991
Date last
2018
Obs
11
Pa first
108
Pa last
295
P.A. Now (θ)
310.4°
Sep first
0.1
Sep last
0.1
Sep. Now (ρ)
0.03"
Mag pri
8.25
Mag sec
8.45
delta mag (ΔM)
0.2
Spectral class
G0/G1V (yellow)
Pri motion ra
+068
Sec motion ra
Pri motion dec
-044
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
295
Precise sep
0.071
Constellation
Sagittarius
SAO
212038
HIP
100417
Tycho2
7454-00791-1
Gaia DR2
21764909824
HD
193464
CD
CD-3713693
CP
CP-37 8776
Distance
59.38
Distance ly
193.7
last precise pa
295
last precise sep
0.071
 
 
ORBITAL ELEMENTS
 
 
Period (P)12.74y± 0.24 Periastron (T)2007.44y± 0.52 Semi-major axis (a)0.112a± 0.0065
Eccentricity (e)0.518± 0.046 Inclination (i)80.8°± 2.7 Longitude of periastron (ω)338.9°± 10.7
Node (Ω)107.8°± 0.6 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.141 282.0
2001 0.158 284.1
2002 0.164 286.0
2003 0.158 287.8
2004 0.139 290.0
2005 0.104 293.3
2006 0.049 302.4
2007 0.027 89.7
2008 0.053 113.4
2009 0.018 163.1
2010 0.045 263.4
2011 0.088 275.5
2012 0.122 279.9
2013 0.147 282.6
2014 0.161 284.6
2015 0.164 286.4
2016 0.155 288.3
2017 0.132 290.7
2018 0.092 294.6
2019 0.032 310.4
2020 0.043 100.3
2021 0.046 118.5
2022 0.017 209.0
2023 0.057 268.3
2024 0.098 276.9
2025 0.129 280.7
2026 0.151 283.2
2027 0.163 285.1
2028 0.163 286.9
2029 0.150 288.9
2030 0.123 291.4

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






wds20217-3637a.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
20217-3637 HDS2908 1991 1 108 0.1 8.25 8.45 G0/G1V 202143.04-363635.9
20217-3637 HDS2908 2008 4 151 0.0 8.25 8.45 G0/G1V 202143.04-363635.9
20217-3637 HDS2908 2013 7 104 0.2 8.25 8.45 G0/G1V 202143.04-363635.9
20217-3637 HDS2908 2014 8 106 0.2 8.25 8.45 G0/G1V 202143.04-363635.9
20217-3637 HDS2908 2015 9 107 0.2 8.25 8.45 G0/G1V 202143.04-363635.9
20217-3637 HDS2908 2017 10 290 0.1 8.25 8.45 G0/G1V O 202143.04-363635.9

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