20452-3120 LDS 720BC

 
 
20H 41M 51.16S -32 26' 06.7" P.A. 143.6 SEP 2.07 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
2014
Obs
25
Pa first
258
Pa last
148
P.A. Now (θ)
143.6°
Sep first
2.8
Sep last
2.2
Sep. Now (ρ)
2.07"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show AU Mic 212402 20452-3120 LDS 720 AB 1920 1999 5 213 999.9 8.93 11.36 2.43
Show 212355 20452-3120 LDS 720 BC 1913 2014 25 144 2.1 11.36 11.49 0.13 Y <===
Triple system
3 visible 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
last precise pa
148.1
last precise sep
2.186
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2012
label rho theta
2000 2.898 176.5
2001 2.856 175.0
2002 2.813 173.6
2003 2.770 172.1
2004 2.725 170.5
2005 2.680 168.9
2006 2.633 167.2
2007 2.586 165.5
2008 2.538 163.7
2009 2.490 161.8
2010 2.440 159.9
2011 2.390 157.8
2012 2.339 155.7
2013 2.286 153.5
2014 2.234 151.2
2015 2.180 148.8
2016 2.125 146.3
2017 2.070 143.6
2018 2.014 140.7
2019 1.957 137.8
2020 1.899 134.6
2021 1.840 131.2
2022 1.780 127.6
2023 1.718 123.7
2024 1.656 119.6
2025 1.593 115.1
2026 1.528 110.3
2027 1.461 105.0
2028 1.393 99.2
2029 1.323 92.8
2030 1.251 85.7

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic