18250+2724 STF 2315 AB (HD 169718)

 
 
18h 24m 58.46s +27° 23' 41.3" P.A. 117.00 sep 0.6 mag 6.57,7.77 Sp A0V+A4V dist. 117.51 pc (383.32 l.y.)
 
 
Coord 2000 18250+2724 Discov num STF2315 Comp AB Coord arcsec 2000 18 24 58.46 +27 23 41.3
Date first 1828 Date last 2018 Obs 265
Pa first 282 Pa last 116.6 P.A. Now (θ) 116.6°
Sep first 0.6 Sep last 0.58 Sep. Now (ρ) 0.58"
Mag pri 6.57 Mag sec 7.77 delta mag (ΔM) 1.2 Spectral class A0V+A4V (white/white)
Pri motion ra +003 Sec motion ra +003
Pri motion dec -012 Sec motion dec -012
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
18250+2724 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 169718 86019 18 24 58 +27 23 41 STF 2315 AB 2018 265 117 0.6 6.57 7.77 1.20 Y <===
Show 86019 18 24 58 +27 23 41 STF 2315 AC 2002 4 79 44.9 6.57 13.90 7.33
Show 86019 18 24 58 +27 23 41 BU 9009 AD 2002 3 290 118.0 6.57 11.40 4.83
Show 18 24 50 +27 24 21 HO 84 DE 2015 33 322 4.4 11.40 13.40 2.00
Quintuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 169718 Constellation Hercules SAO 86019 HIP 90256
Tycho2 2101-02501-1 Gaia DR2 4585618899835473408 HD 169718 HR 6904
GC 25147 ADS 11334 BD BD+27 3016 Distance 117.51
Distance ly 383.32
 
 
ORBITAL ELEMENTS
 
 
Period (P)2094y Periastron (T)1982y Semi-major axis (a)2.062a
Eccentricity (e)0.6877 Inclination (i)107.6° Longitude of periastron (ω)352.4°
Node (Ω)127.7° Notesn ReferenceWSI2004b
Equinox2000 Last observation2003 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 123.1 0.644
2001 122.7 0.643
2002 122.3 0.642
2003 121.9 0.640
2004 121.5 0.639
2005 121.1 0.637
2006 120.7 0.635
2007 120.3 0.633
2008 119.9 0.631
2009 119.5 0.629
2010 119.1 0.627
2011 118.7 0.624
2012 118.3 0.622
2013 117.9 0.619
2014 117.5 0.616
2015 117.0 0.613
2016 116.6 0.610
2017 116.2 0.607
2018 115.7 0.604
2019 115.3 0.601
2020 114.8 0.597
2021 114.4 0.594
2022 113.9 0.591
2023 113.5 0.587
2024 113.0 0.583
2025 112.5 0.579
2026 112.1 0.576
2027 111.6 0.572
2028 111.1 0.568
2029 110.6 0.564
2030 110.1 0.560


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


 
  


wds18250%2B2724a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic