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 Discov num HU  198 Comp Coord arcsec 2000 18 38 21.13 +08 50 02.6
Date first 1900 Date last 2021 Obs 86
Pa first 195 Pa last 126 P.A. Now (θ) 126°
Sep first 0.2 Sep last 0.539 Sep. Now (ρ) 0.539"
Mag pri 8.50 Mag sec 8.60 delta mag (ΔM) 0.1 Spectral class K1III (yellow-orange)
Pri motion ra +006 Sec motion ra
Pri motion dec +015 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name X Oph Constellation Ophiuchus SAO 123744 HIP 91389
Tycho2 1025-01976-1 Gaia DR2 4479466244818808832 HD 172171 HR 7002
GC 25485 ADS 11524 BD BD+08 3780 Distance 20.58
Distance ly 67.13
 
 
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 Notesn ReferenceNov2007d
Equinox2000 Last observation2004 Grade4(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


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds18384%2B0850b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic