15550-1923 HU 1274 (47 Lib)
15h 55m 00.37s -19° 22' 58.4" P.A. 114.00 sep 0.4 mag 6.04,8.50 Sp B5V dist. 236.41 pc (771.17 l.y.)
Coord 2000 |
15550-1923 |
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Discov num |
HU 1274 |
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Comp |
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Coord arcsec 2000 |
15 55 00.37 -19 22 58.4 |
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Date first |
1904 |
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Date last |
2018 |
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Obs |
39 |
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Pa first |
154 |
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Pa last |
113.9 |
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P.A. Now (θ) |
113.9° |
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Sep first |
0.4 |
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Sep last |
0.41 |
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Sep. Now (ρ) |
0.41" |
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Mag pri |
6.04 |
|
Mag sec |
8.50 |
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delta mag (ΔM) |
2.46 |
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Spectral class |
B5V (blue-white) |
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Pri motion ra |
-010 |
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Sec motion ra |
-010 |
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Pri motion dec |
-014 |
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Sec motion dec |
-014 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
47 Lib |
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Var name |
NSV7327 Lib |
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Constellation |
Libra |
|
SAO |
159572 |
|
HIP |
77939 |
|
Tycho2 |
6195-00249-1 |
|
Gaia DR2 |
6247821859582891264 |
|
HD |
142378 |
|
HR |
5915 |
|
GC |
21364 |
|
ADS |
9834 |
|
BD |
BD-18 4195 |
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CP |
CP-19 5926 |
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Flamsteed |
47 Librae |
|
Flamsteed name |
47 Lib |
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Distance |
236.41 |
|
Distance ly |
771.17 |
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ORBITAL ELEMENTS
Period (P) | 361y | |
Periastron (T) | 1974.3y | |
Semi-major axis (a) | 0.576a | |
Eccentricity (e) | 0 | |
Inclination (i) | 101.7° | |
Longitude of periastron (ω) | 0° | |
Node (Ω) | 124.4° | |
Notes | n | |
Reference | Zir2015a | |
Equinox | 2000 | |
Last observation | 2009 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
118.8 |
0.522 |
2001 |
118.6 |
0.518 |
2002 |
118.3 |
0.513 |
2003 |
118.1 |
0.509 |
2004 |
117.8 |
0.504 |
2005 |
117.6 |
0.499 |
2006 |
117.3 |
0.494 |
2007 |
117.0 |
0.489 |
2008 |
116.7 |
0.484 |
2009 |
116.4 |
0.479 |
2010 |
116.1 |
0.473 |
2011 |
115.8 |
0.468 |
2012 |
115.5 |
0.462 |
2013 |
115.2 |
0.456 |
2014 |
114.9 |
0.450 |
2015 |
114.5 |
0.444 |
2016 |
114.2 |
0.438 |
2017 |
113.8 |
0.431 |
2018 |
113.5 |
0.425 |
2019 |
113.1 |
0.418 |
2020 |
112.7 |
0.412 |
2021 |
112.3 |
0.405 |
2022 |
111.9 |
0.398 |
2023 |
111.5 |
0.391 |
2024 |
111.0 |
0.384 |
2025 |
110.6 |
0.377 |
2026 |
110.1 |
0.370 |
2027 |
109.6 |
0.362 |
2028 |
109.0 |
0.355 |
2029 |
108.5 |
0.347 |
2030 |
107.9 |
0.340 |
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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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