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 |
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Comp |
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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 |
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Sec motion ra |
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| Pri motion dec |
+094 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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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 | | |
Reference | Tok2017b | |
| Equinox | 2000 | |
Last observation | | |
Grade | 3 | (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 |
| 2031 |
32.6 |
0.304 |
| 2032 |
39.7 |
0.317 |
| 2033 |
46.7 |
0.306 |
| 2034 |
54.9 |
0.271 |
| 2035 |
66.7 |
0.212 |
| 2036 |
91.4 |
0.130 |
| 2037 |
181.5 |
0.071 |
| 2038 |
336.8 |
0.092 |
| 2039 |
12.9 |
0.201 |
| 2040 |
25.3 |
0.270 |
| 2041 |
33.5 |
0.307 |
| 2042 |
40.5 |
0.317 |
| 2043 |
47.5 |
0.303 |
| 2044 |
56.0 |
0.266 |
| 2045 |
68.5 |
0.204 |
| 2046 |
96.5 |
0.120 |
| 2047 |
197.1 |
0.071 |
| 2048 |
344.9 |
0.106 |
| 2049 |
14.7 |
0.210 |
| 2050 |
26.3 |
0.276 |
|
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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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