19531-2528 B 454 (HD 187858)
19h 53m 08.30s -25° 27' 41.2" P.A. 337.00 sep 0.3 mag 8.71,8.87 Sp F8V dist. 89.13 pc (290.74 l.y.)
Coord 2000 |
19531-2528 |
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Discov num |
B 454 |
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Comp |
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Coord arcsec 2000 |
19 53 08.30 -25 27 41.2 |
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Date first |
1926 |
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Date last |
2017 |
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Obs |
29 |
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Pa first |
338 |
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Pa last |
336.8 |
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P.A. Now (θ) |
337.8° |
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Sep first |
0.3 |
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Sep last |
0.266 |
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Sep. Now (ρ) |
0.304" |
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Mag pri |
8.71 |
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Mag sec |
8.87 |
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delta mag (ΔM) |
0.16 |
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Spectral class |
F8V (yellow-white) |
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Pri motion ra |
+008 |
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Sec motion ra |
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Pri motion dec |
-037 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 187858 |
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Constellation |
Sagittarius |
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SAO |
188673 |
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HIP |
97851 |
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Tycho2 |
6895-01740-1 |
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HD |
187858 |
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GC |
27522 |
|
ADS |
13048 |
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CD |
CD-2514403 |
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CP |
CP-25 6930 |
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Distance |
89.13 |
|
Distance ly |
290.74 |
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ORBITAL ELEMENTS
Period (P) | 47.21y | |
Periastron (T) | 2006.84y | |
Semi-major axis (a) | 0.196a | |
Eccentricity (e) | 0.764 | |
Inclination (i) | 78.8° | |
Longitude of periastron (ω) | 32° | |
Node (Ω) | 153.8° | |
Notes | n | |
Reference | Doc2010j | |
Equinox | 2000 | |
Last observation | 2009 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
0.2 |
0.086 |
2001 |
6.7 |
0.066 |
2002 |
19.0 |
0.046 |
2003 |
47.1 |
0.030 |
2004 |
97.8 |
0.028 |
2005 |
131.1 |
0.041 |
2006 |
147.5 |
0.052 |
2007 |
165.2 |
0.033 |
2008 |
303.5 |
0.025 |
2009 |
323.1 |
0.073 |
2010 |
327.5 |
0.112 |
2011 |
329.8 |
0.145 |
2012 |
331.2 |
0.173 |
2013 |
332.3 |
0.196 |
2014 |
333.2 |
0.216 |
2015 |
333.9 |
0.234 |
2016 |
334.5 |
0.249 |
2017 |
335.1 |
0.261 |
2018 |
335.6 |
0.272 |
2019 |
336.1 |
0.282 |
2020 |
336.5 |
0.289 |
2021 |
337.0 |
0.295 |
2022 |
337.4 |
0.300 |
2023 |
337.8 |
0.304 |
2024 |
338.2 |
0.306 |
2025 |
338.6 |
0.307 |
2026 |
338.9 |
0.307 |
2027 |
339.3 |
0.306 |
2028 |
339.7 |
0.304 |
2029 |
340.1 |
0.301 |
2030 |
340.5 |
0.297 |
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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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