18384+0850 HU 198 (X Oph)
18h 38m 21.13s +08° 50' 02.6" P.A. 126.00 sep 0.5 mag 8.50,8.60 Sp K1III dist. 20.58 pc (67.13 l.y.)
Coord 2000 |
18384+0850 |
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Discov num |
HU 198 |
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Comp |
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Coord arcsec 2000 |
18 38 21.13 +08 50 02.6 |
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Date first |
1900 |
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Date last |
2021 |
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Obs |
86 |
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Pa first |
195 |
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Pa last |
126 |
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P.A. Now (θ) |
126° |
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Sep first |
0.2 |
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Sep last |
0.539 |
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Sep. Now (ρ) |
0.539" |
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Mag pri |
8.50 |
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Mag sec |
8.60 |
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delta mag (ΔM) |
0.1 |
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Spectral class |
K1III (yellow-orange) |
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Pri motion ra |
+006 |
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Sec motion ra |
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Pri motion dec |
+015 |
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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
Var name |
X Oph |
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Constellation |
Ophiuchus |
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SAO |
123744 |
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HIP |
91389 |
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Tycho2 |
1025-01976-1 |
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Gaia DR2 |
4479466244818808832 |
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HD |
172171 |
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HR |
7002 |
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GC |
25485 |
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ADS |
11524 |
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BD |
BD+08 3780 |
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Distance |
20.58 |
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Distance ly |
67.13 |
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ORBITAL ELEMENTS
Period (P) | 877.14y | ± 24.53 |
Periastron (T) | 2020.98y | ± 23.27 |
Semi-major axis (a) | 0.822a | ± 0.09 |
Eccentricity (e) | 0.446 | ± 0.026 |
Inclination (i) | 103.7° | ± 1.2 |
Longitude of periastron (ω) | 14.1° | ± 2.6 |
Node (Ω) | 130.1° | ± 0.3 |
Notes | n | |
Reference | Nov2007d | |
Equinox | 2000 | |
Last observation | 2004 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
132.6 |
0.461 |
2001 |
132.3 |
0.461 |
2002 |
132.1 |
0.462 |
2003 |
131.8 |
0.462 |
2004 |
131.5 |
0.462 |
2005 |
131.2 |
0.462 |
2006 |
131.0 |
0.461 |
2007 |
130.7 |
0.461 |
2008 |
130.4 |
0.460 |
2009 |
130.1 |
0.460 |
2010 |
129.9 |
0.459 |
2011 |
129.6 |
0.458 |
2012 |
129.3 |
0.457 |
2013 |
129.0 |
0.456 |
2014 |
128.7 |
0.455 |
2015 |
128.4 |
0.453 |
2016 |
128.2 |
0.452 |
2017 |
127.9 |
0.450 |
2018 |
127.6 |
0.448 |
2019 |
127.3 |
0.447 |
2020 |
127.0 |
0.445 |
2021 |
126.7 |
0.442 |
2022 |
126.4 |
0.440 |
2023 |
126.1 |
0.438 |
2024 |
125.8 |
0.435 |
2025 |
125.5 |
0.433 |
2026 |
125.1 |
0.430 |
2027 |
124.8 |
0.427 |
2028 |
124.5 |
0.424 |
2029 |
124.2 |
0.421 |
2030 |
123.8 |
0.418 |
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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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