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° | |
Notes | n | |
Reference | Hrt2014b | |
Equinox | 2000 | |
Last observation | 2012 | |
Grade | 5 | (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 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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