18086+1838 HU 314 (HD 166157)

 
 
18h 08m 38.26s +18° 38' 08.8" P.A. 71.00 sep 0.3 mag 8.84,9.22 Sp B9.5V dist. 1190.48 pc (3883.35 l.y.)
 
 
Coord 2000 18086+1838 Discov num HU  314 Comp Coord arcsec 2000 18 08 38.26 +18 38 08.8
Date first 1901 Date last 2016 Obs 49
Pa first 147 Pa last 70.9 P.A. Now (θ) 70.9°
Sep first 0.4 Sep last 0.271 Sep. Now (ρ) 0.271"
Mag pri 8.84 Mag sec 9.22 delta mag (ΔM) 0.38 Spectral class B9.5V (blue-white)
Pri motion ra +006 Sec motion ra
Pri motion dec -002 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 166157 Constellation Hercules SAO 103419 HIP 88875
Tycho2 1571-00365-1 HD 166157 ADS 11098 BD BD+18 3566
Distance 1190.48 Distance ly 3883.35
 
 
ORBITAL ELEMENTS
 
 
Period (P)1075y Periastron (T)1885.7y Semi-major axis (a)0.602a
Eccentricity (e)0.2 Inclination (i)123.1° Longitude of periastron (ω)31.7°
Node (Ω)170° Notes ReferenceZir2015a
Equinox2000 Last observation2010 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 84.9 0.284
2001 84.1 0.284
2002 83.3 0.285
2003 82.5 0.285
2004 81.7 0.285
2005 80.9 0.285
2006 80.1 0.286
2007 79.3 0.286
2008 78.5 0.286
2009 77.7 0.287
2010 76.9 0.287
2011 76.1 0.288
2012 75.4 0.288
2013 74.6 0.289
2014 73.8 0.289
2015 73.0 0.290
2016 72.3 0.291
2017 71.5 0.292
2018 70.7 0.292
2019 70.0 0.293
2020 69.2 0.294
2021 68.5 0.295
2022 67.7 0.296
2023 67.0 0.297
2024 66.2 0.298
2025 65.5 0.299
2026 64.8 0.300
2027 64.1 0.301
2028 63.4 0.302
2029 62.6 0.303
2030 61.9 0.304


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


 
  


wds18086%2B1838a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic