18464-2755 RST 2073 (HD 173428)
18h 46m 19.73s -27° 54' 57.6" P.A. 149.00 sep 0.4 mag 10.10,10.10 Sp G2V
Coord 2000 |
18464-2755 |
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Discov num |
RST2073 |
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Comp |
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Coord arcsec 2000 |
18 46 19.73 -27 54 57.6 |
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Date first |
1931 |
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Date last |
2018 |
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Obs |
10 |
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Pa first |
57 |
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Pa last |
149.4 |
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P.A. Now (θ) |
145.1° |
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Sep first |
0.3 |
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Sep last |
0.35 |
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Sep. Now (ρ) |
0.388" |
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Mag pri |
10.10 |
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Mag sec |
10.10 |
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delta mag (ΔM) |
0 |
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Spectral class |
G2V (yellow) |
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Pri motion ra |
+018 |
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Sec motion ra |
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Pri motion dec |
+014 |
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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
Name |
HD 173428 |
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Constellation |
Sagittarius |
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Tycho2 |
6867-01366-1 |
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HD |
173428 |
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ORBITAL ELEMENTS
Period (P) | 243.5y | ± 13.5 |
Periastron (T) | 1983y | ± 0.28 |
Semi-major axis (a) | 0.406a | ± 0.015 |
Eccentricity (e) | 0.544 | ± 0.03 |
Inclination (i) | 128° | ± 1.5 |
Longitude of periastron (ω) | 214° | ± 3 |
Node (Ω) | 130.6° | ± 2.5 |
Notes | | |
Reference | Doc2018l | |
Equinox | 2000 | |
Last observation | 2018 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
185.7 |
0.179 |
2001 |
181.9 |
0.188 |
2002 |
178.6 |
0.198 |
2003 |
175.5 |
0.208 |
2004 |
172.7 |
0.217 |
2005 |
170.2 |
0.227 |
2006 |
167.8 |
0.237 |
2007 |
165.7 |
0.247 |
2008 |
163.7 |
0.257 |
2009 |
161.9 |
0.267 |
2010 |
160.2 |
0.276 |
2011 |
158.6 |
0.286 |
2012 |
157.1 |
0.295 |
2013 |
155.7 |
0.305 |
2014 |
154.4 |
0.314 |
2015 |
153.1 |
0.323 |
2016 |
151.9 |
0.331 |
2017 |
150.8 |
0.340 |
2018 |
149.8 |
0.348 |
2019 |
148.7 |
0.357 |
2020 |
147.8 |
0.365 |
2021 |
146.8 |
0.372 |
2022 |
146.0 |
0.380 |
2023 |
145.1 |
0.388 |
2024 |
144.3 |
0.395 |
2025 |
143.5 |
0.402 |
2026 |
142.7 |
0.409 |
2027 |
142.0 |
0.416 |
2028 |
141.3 |
0.423 |
2029 |
140.6 |
0.429 |
2030 |
139.9 |
0.436 |
2031 |
139.2 |
0.442 |
2032 |
138.6 |
0.448 |
2033 |
138.0 |
0.454 |
2034 |
137.4 |
0.460 |
2035 |
136.8 |
0.465 |
2036 |
136.2 |
0.471 |
2037 |
135.7 |
0.476 |
2038 |
135.1 |
0.481 |
2039 |
134.6 |
0.486 |
2040 |
134.0 |
0.491 |
2041 |
133.5 |
0.495 |
2042 |
133.0 |
0.500 |
2043 |
132.5 |
0.504 |
2044 |
132.0 |
0.509 |
2045 |
131.5 |
0.513 |
2046 |
131.1 |
0.517 |
2047 |
130.6 |
0.521 |
2048 |
130.1 |
0.524 |
2049 |
129.7 |
0.528 |
2050 |
129.2 |
0.531 |
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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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