18018+0118 BU 1125 AB (68 Oph)

 
 
18h 01m 45.19s +01° 18' 18.4" P.A. 170.00 sep 0.4 mag 4.52,7.48 Sp A2Vn dist. 89.69 pc (292.57 l.y.)
 
 
Coord 2000 18018+0118 Discov num BU 1125 Comp AB Coord arcsec 2000 18 01 45.19 +01 18 18.4
Date first 1889 Date last 2021 Obs 61
Pa first 12 Pa last 169.5 P.A. Now (θ) 169.5°
Sep first 1.1 Sep last 0.404 Sep. Now (ρ) 0.404"
Mag pri 4.52 Mag sec 7.48 delta mag (ΔM) 2.96 Spectral class A2Vn (white)
Pri motion ra +013 Sec motion ra
Pri motion dec -015 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
18018+0118 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 68 Oph 123035 18 01 45 +01 18 18 BU 1125 AB 2021 61 170 0.4 4.52 7.48 2.96 Y <===
Show 123035 18 01 45 +01 18 18 SP 3 AB,C 1892 1 315 0.4 4.45
Triple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 68 Oph Var name NSV10009 Oph Constellation Ophiuchus SAO 123035
HIP 88290 Tycho2 0430-03748-1 Gaia DR2 4467810837428358144 HD 164577
HR 6723 GC 24534 ADS 10990 BD BD+01 3560
Flamsteed 68 Ophiuchi Flamsteed name 68 Oph Distance 89.69 Distance ly 292.57
 
 
ORBITAL ELEMENTS
 
 
Period (P)213.97y± 23.83 Periastron (T)2028.73y± 1.62 Semi-major axis (a)0.787a± 0.033
Eccentricity (e)0.601± 0.074 Inclination (i)55.1°± 5.1 Longitude of periastron (ω)66°± 5.1
Node (Ω)161.3°± 4.4 Notesn ReferenceTok2015c
Equinox2000 Last observation2014 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 122.4 0.539
2001 124.0 0.536
2002 125.7 0.533
2003 127.4 0.530
2004 129.1 0.527
2005 130.8 0.524
2006 132.6 0.520
2007 134.3 0.515
2008 136.2 0.511
2009 138.0 0.506
2010 139.9 0.500
2011 141.8 0.493
2012 143.8 0.486
2013 145.8 0.479
2014 148.0 0.470
2015 150.2 0.460
2016 152.5 0.450
2017 154.9 0.438
2018 157.5 0.425
2019 160.2 0.410
2020 163.1 0.394
2021 166.4 0.376
2022 169.9 0.357
2023 173.9 0.336
2024 178.4 0.314
2025 183.6 0.291
2026 189.7 0.267
2027 197.0 0.244
2028 205.9 0.222
2029 216.5 0.203
2030 228.8 0.190


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



 
 


wds18018%2B0118b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic