18384+0850 HU  198 (X Oph)

 
 
18h 38m 21.13s +08 50' 02.6" P.A. 127.9 sep 0.45 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
2011
Obs
82
Pa first
195
Pa last
127
P.A. Now (θ)
127.9°
Sep first
0.2
Sep last
0.5
Sep. Now (ρ)
0.45"
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
 
 
Precise pa
127.2
Precise sep
0.515
Var name
X Oph
Constellation
Ophiuchus
SAO
123744
HIP
91389
Tycho2
1025-01976-1
HD
172171
HR
7002
ADS
11524
BD
BD+08 3780
Distance
20.58
Distance ly
67.13
last precise pa
127.2
last precise sep
0.515
 
 
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 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2004
label rho theta
2000 0.461 132.6
2001 0.461 132.3
2002 0.462 132.1
2003 0.462 131.8
2004 0.462 131.5
2005 0.462 131.2
2006 0.461 131.0
2007 0.461 130.7
2008 0.460 130.4
2009 0.460 130.1
2010 0.459 129.9
2011 0.458 129.6
2012 0.457 129.3
2013 0.456 129.0
2014 0.455 128.7
2015 0.453 128.4
2016 0.452 128.2
2017 0.450 127.9
2018 0.448 127.6
2019 0.447 127.3
2020 0.445 127.0
2021 0.442 126.7
2022 0.440 126.4
2023 0.438 126.1
2024 0.435 125.8
2025 0.433 125.5
2026 0.430 125.1
2027 0.427 124.8
2028 0.424 124.5
2029 0.421 124.2
2030 0.418 123.8

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

grafico orbita





wds18384%2B0850b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18384+0850 HU 198 2004 73 130 0.5 8.50 8.60 K1III NOD 183821.13+085002.6
18384+0850 HU 198 2009 74 128 0.5 8.50 8.60 K1III NOD 183821.13+085002.6
18384+0850 HU 198 2011 82 127 0.5 8.50 8.60 K1III NO 183821.13+085002.6

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