20452-3120 LDS 720 BC

 
 
20h 41m 51.16s -32° 26' 06.7" P.A. 128.00 sep 1.8 mag 11.36,11.49 Sp M4Ve dist. 10.7 pc (34.9 l.y.)
 
 
Coord 2000 20452-3120 Discov num LDS 720 Comp BC Coord arcsec 2000 20 41 51.16 -32 26 06.7
Date first 1913 Date last 2020 Obs 27
Pa first 258 Pa last 127.9 P.A. Now (θ) 127.9°
Sep first 2.8 Sep last 1.759 Sep. Now (ρ) 1.759"
Mag pri 11.36 Mag sec 11.49 delta mag (ΔM) 0.13 Spectral class M4Ve (red)
Pri motion ra +269 Sec motion ra +286
Pri motion dec -366 Sec motion dec -377
Notes N O (See Notes, Orbital solution)
rPM=0.043 (< 0.3, Physical double)
This double is physical.
 
 
20452-3120 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show AU Mic 212402 20 45 10 -31 20 27 LDS 720 AB 1999 5 213 999.9 8.93 11.36 2.43
Show 212355 20 41 51 -32 26 07 LDS 720 BC 2020 27 128 1.8 11.36 11.49 0.13 Y <===
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name AT Mic Constellation Microscopium SAO 212355 HIP 102141
Tycho2 7460-00137-1 HD 196982 GL Gl 799A CD CD-3216135
Distance 10.7 Distance ly 34.9
 
 
ORBITAL ELEMENTS
 
 
Period (P)141.39y Periastron (T)2035.1y Semi-major axis (a)2.616a
Eccentricity (e)0.607 Inclination (i)148.4° Longitude of periastron (ω)54.6°
Node (Ω)82.6° Notesn ReferenceHrt2014b
Equinox2000 Last observation2012 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 176.5 2.898
2001 175.0 2.856
2002 173.6 2.813
2003 172.1 2.770
2004 170.5 2.725
2005 168.9 2.680
2006 167.2 2.633
2007 165.5 2.586
2008 163.7 2.538
2009 161.8 2.490
2010 159.9 2.440
2011 157.8 2.390
2012 155.7 2.339
2013 153.5 2.286
2014 151.2 2.234
2015 148.8 2.180
2016 146.3 2.125
2017 143.6 2.070
2018 140.7 2.014
2019 137.8 1.957
2020 134.6 1.899
2021 131.2 1.840
2022 127.6 1.780
2023 123.7 1.718
2024 119.6 1.656
2025 115.1 1.593
2026 110.3 1.528
2027 105.0 1.461
2028 99.2 1.393
2029 92.8 1.323
2030 85.7 1.251


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



 
 


wds20452-3120a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic