18031-0811 STF2262AB (Tau Oph)

 
 
18h 03m 04.91s -08 10' 48.9" P.A. 288.4 sep 1.51 mag 5.27,5.86 Sp F4IV+F5V dist. 51.33 pc (167.44 l.y.)
 
 
Coord 2000
18031-0811
Discov num
STF2262
Comp
AB
Coord arcsec 2000
18 03 04.91 -08 10 48.9
Date first
1835
Date last
2017
Obs
638
Pa first
193
Pa last
290
P.A. Now (θ)
288.4°
Sep first
0.4
Sep last
1.5
Sep. Now (ρ)
1.51"
Mag pri
5.27
Mag sec
5.86
delta mag (ΔM)
0.59
Spectral class
F4IV+F5V (yellow-white/yellow-white)
Pri motion ra
+009
Sec motion ra
+009
Pri motion dec
-048
Sec motion dec
-048
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18031-0811 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Tau Oph 142050 18031-0811 STF2262 AB 1835 2017 638 288 1.5 5.27 5.86 0.59 Y <===
Show 142050 18031-0811 STF2262 AC 1832 2000 13 125 100.8 5.27 11.28 6.01
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
289.5
Precise sep
1.454
Name
Tau Oph
Constellation
Ophiuchus
SAO
142050
HIP
88404
Tycho2
5675-00662-1
HD
164764
HR
6733
GC
24565
ADS
11005
GL
Gl 700.1B
BD
BD-08 4549
Bayer
Tau Ophiuchi
Bayer name
Tau Oph
Flamsteed
69 Ophiuchi
Flamsteed name
69 Oph
Distance
51.33
Distance ly
167.44
last precise pa
289.5
last precise sep
1.454
 
 
ORBITAL ELEMENTS
 
 
Period (P)257y Periastron (T)1829y Semi-major axis (a)1.4a
Eccentricity (e)0.77 Inclination (i)52° Longitude of periastron (ω)42°
Node (Ω)60° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 1.751 281.1
2001 1.739 281.5
2002 1.726 281.8
2003 1.714 282.2
2004 1.701 282.5
2005 1.688 282.9
2006 1.675 283.3
2007 1.662 283.7
2008 1.649 284.1
2009 1.635 284.5
2010 1.621 284.9
2011 1.607 285.3
2012 1.593 285.7
2013 1.579 286.2
2014 1.564 286.6
2015 1.550 287.0
2016 1.535 287.5
2017 1.520 287.9
2018 1.505 288.4
2019 1.490 288.9
2020 1.474 289.4
2021 1.459 289.9
2022 1.443 290.4
2023 1.427 290.9
2024 1.411 291.5
2025 1.395 292.0
2026 1.378 292.6
2027 1.362 293.2
2028 1.345 293.7
2029 1.328 294.3
2030 1.311 295.0

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

grafico orbita





wds18031-0811a.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
18031-0811 STF2262 AB 2006 662 285 1.6 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2009 664 285 1.6 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2010 675 286 1.5 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2011 679 286 1.5 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2012 682 287 1.5 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2013 684 286 1.5 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2014 633 288 1.6 5.27 5.86 F4IV F5V NOD 180304.91-081048.9
18031-0811 STF2262 AB 2016 634 288 1.5 5.27 5.86 F4IV+F5V NO 180304.91-081048.9
18031-0811 STF2262 AB 2017 638 290 1.5 5.27 5.86 F4IV+F5V NO 180304.91-081048.9

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