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 |
|
Discov num |
B 454 |
|
Comp |
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Coord arcsec 2000 |
19 53 08.30 -25 27 41.2 |
|
| Date first |
1926 |
|
Date last |
2017 |
|
Obs |
29 |
|
| Pa first |
338 |
|
Pa last |
336.8 |
|
P.A. Now (θ) |
337.8° |
|
| Sep first |
0.3 |
|
Sep last |
0.266 |
|
Sep. Now (ρ) |
0.304" |
|
| Mag pri |
8.71 |
|
Mag sec |
8.87 |
|
delta mag (ΔM) |
0.16 |
|
Spectral class |
F8V (yellow-white) |
|
| Pri motion ra |
+008 |
|
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 |
|
Constellation |
Sagittarius |
|
SAO |
188673 |
|
HIP |
97851 |
|
| Tycho2 |
6895-01740-1 |
|
HD |
187858 |
|
GC |
27522 |
|
ADS |
13048 |
|
| CD |
CD-2514403 |
|
CP |
CP-25 6930 |
|
Distance |
89.13 |
|
Distance ly |
290.74 |
|
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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