18189-1348 SNA 91 Aa,Ab (HD 168137)

 
 
18h 18m 56.19s -13° 48' 31.1" P.A. 212.00 sep 0.0 mag 8.30,8.60 Sp O8V dist. 427.35 pc (1394.02 l.y.)
 
 
Coord 2000 18189-1348 Discov num SNA  91 Comp Aa,Ab Coord arcsec 2000 18 18 56.19 -13 48 31.1
Date first 2009 Date last 2016 Obs 12
Pa first 168 Pa last 212.3 P.A. Now (θ) 212.3°
Sep first 0.0 Sep last 0.007 Sep. Now (ρ) 0.007"
Mag pri 8.30 Mag sec 8.60 delta mag (ΔM) 0.3 Spectral class O8V (blue)
Pri motion ra +003 Sec motion ra
Pri motion dec +000 Sec motion dec
Notes N V K (See Notes, Proper motion indicates physical, K-band or other infrared magnitudes)
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
 
 
18189-1348 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 168137 161316 18 18 56 -13 48 31 SNA 91 Aa,Ab 2016 12 212 0.0 8.30 8.60 0.30 Y <===
Show 161316 18 18 56 -13 48 31 HDS 2590 AB 2016 3 353 2.1 9.05 12.90 3.85
Triple system
2 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 168137 Constellation Serpens SAO 161316 HIP 89750
Tycho2 5689-01097-1 Gaia DR2 4146599682284818176 HD 168137 BD BD-13 4932
Distance 427.35 Distance ly 1394.02
 
 
ORBITAL ELEMENTS
 
 
Period (P)1836d (5.03y)± 20 Periastron (T)53525d (2005.422y)± 14 Semi-major axis (a)7m± 3.9
Eccentricity (e)0.902± 0.058 Inclination (i)105.2°± 4 Longitude of periastron (ω)246.7°± 9
Node (Ω)231.2°± 5 Notes ReferenceLeB2017
Equinox Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 114.6 0.002
2001-01-01 217.4 0.006
2002-01-01 208.1 0.007
2003-01-01 198.9 0.006
2004-01-01 182.8 0.004
2005-01-01 118.3 0.002
2006-01-01 217.7 0.006
2007-01-01 208.3 0.007
2008-01-01 199.2 0.006
2009-01-01 183.4 0.004
2010-01-01 121.9 0.002
2011-01-01 218.1 0.005
2012-01-01 208.5 0.007
2013-01-01 199.5 0.006
2014-01-01 184.1 0.004
2015-01-01 125.4 0.002
2016-01-01 218.5 0.005
2017-01-01 208.7 0.007
2018-01-01 199.8 0.006
2019-01-01 184.7 0.004
2020-01-01 128.7 0.002
2021-01-01 218.8 0.005
2022-01-01 209.0 0.007
2023-01-01 200.0 0.006
2024-01-01 185.3 0.004
2025-01-01 131.9 0.002
2026-01-01 219.2 0.005
2027-01-01 209.2 0.007
2028-01-01 200.3 0.006
2029-01-01 185.9 0.004
2030-01-01 134.9 0.002


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


 
  


wds18189-1348a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic