20212-5147 HDS 2907

 
 
20h 21m 10.95s -51 47' 28.6" P.A. 35.00 sep 0.3 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 2021 Obs 12
Pa first 31 Pa last 35.1 P.A. Now (θ) 45.9°
Sep first 0.3 Sep last 0.317 Sep. Now (ρ) 0.309"
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
 
 
Constellation Telescopium HIP 100356 Tycho2 8417-00626-1 Gaia DR2 6475337306723609600
GL NN 4145 Distance 24.01 Distance ly 78.32
 
 
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 Notes ReferenceTok2017b
Equinox2000 Last observation Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 20.5 0.243
2001 30.0 0.294
2002 37.3 0.316
2003 44.2 0.313
2004 51.9 0.286
2005 62.0 0.235
2006 80.0 0.160
2007 137.8 0.079
2008 291.7 0.060
2009 5.9 0.168
2010 21.8 0.250
2011 30.9 0.298
2012 38.1 0.317
2013 45.0 0.311
2014 52.8 0.281
2015 63.5 0.228
2016 83.3 0.150
2017 151.3 0.074
2018 311.1 0.068
2019 8.5 0.179
2020 23.0 0.258
2021 31.8 0.301
2022 38.9 0.317
2023 45.9 0.309
2024 53.9 0.276
2025 65.0 0.220
2026 87.1 0.140
2027 166.0 0.072
2028 325.9 0.079
2029 10.8 0.190
2030 24.2 0.264


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



 
 


wds20212-5147e.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic