20212-5147 HDS2907

 
 
20h 21m 10.95s -51 47' 28.6" P.A. 8.5 sep 0.18 mag 10.86,11.32 Sp M0 dist. 24.01 pc (78.32 l.y.)
 
 
Coord 2000
20212-5147
Discov num
HDS2907
Comp
Coord arcsec 2000
20 21 10.95 -51 47 28.6
Date first
1991
Date last
2018
Obs
9
Pa first
31
Pa last
359
P.A. Now (θ)
8.5°
Sep first
0.3
Sep last
0.1
Sep. Now (ρ)
0.18"
Mag pri
10.86
Mag sec
11.32
delta mag (ΔM)
0.46
Spectral class
M0 (red)
Pri motion ra
-040
Sec motion ra
Pri motion dec
+094
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
359.4
Precise sep
0.148
Constellation
Telescopium
HIP
100356
Tycho2
8417-00626-1
Gaia DR2
06723609600
GL
NN 4145
Distance
24.01
Distance ly
78.32
last precise pa
359.4
last precise sep
0.148
 
 
ORBITAL ELEMENTS
 
 
Period (P)9.886y± 0.129 Periastron (T)2017.514y± 0.016 Semi-major axis (a)0.1948a± 0.0047
Eccentricity (e)0.651± 0.016 Inclination (i)48.8°± 2.3 Longitude of periastron (ω)194°± 5.5
Node (Ω)32.7°± 3.2 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.243 20.5
2001 0.294 30.0
2002 0.316 37.3
2003 0.313 44.2
2004 0.286 51.9
2005 0.235 62.0
2006 0.160 80.0
2007 0.079 137.8
2008 0.060 291.7
2009 0.168 5.9
2010 0.250 21.8
2011 0.298 30.9
2012 0.317 38.1
2013 0.311 45.0
2014 0.281 52.8
2015 0.228 63.5
2016 0.150 83.3
2017 0.074 151.3
2018 0.068 311.1
2019 0.179 8.5
2020 0.258 23.0
2021 0.301 31.8
2022 0.317 38.9
2023 0.309 45.9
2024 0.276 53.9
2025 0.220 65.0
2026 0.140 87.1
2027 0.072 166.0
2028 0.079 325.9
2029 0.190 10.8
2030 0.264 24.2

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






wds20212-5147e.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
20212-5147 HDS2907 1991 1 31 0.3 10.86 11.32 M0 202110.95-514728.6
20212-5147 HDS2907 2014 2 60 0.2 10.86 11.32 M0 202110.95-514728.6
20212-5147 HDS2907 2015 3 72 0.2 10.86 11.32 M0 202110.95-514728.6
20212-5147 HDS2907 2017 7 210 0.1 10.86 11.32 M0 202110.95-514728.6

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