18360+1144 STT 357 (HD 171728)

 
 
18h 35m 57.08s +11° 43' 42.1" P.A. 68.00 sep 0.4 mag 8.08,8.87 Sp A7V dist. 223.21 pc (728.11 l.y.)
 
 
Coord 2000 18360+1144 Discov num STT 357 Comp Coord arcsec 2000 18 35 57.08 +11 43 42.1
Date first 1843 Date last 2019 Obs 146
Pa first 272 Pa last 68.4 P.A. Now (θ) 64.9°
Sep first 0.5 Sep last 0.35 Sep. Now (ρ) 0.362"
Mag pri 8.08 Mag sec 8.87 delta mag (ΔM) 0.79 Spectral class A7V (white)
Pri motion ra +012 Sec motion ra +012
Pri motion dec -011 Sec motion dec -011
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 171728 Constellation Ophiuchus SAO 103885 HIP 91167
Tycho2 1032-01257-1 HD 171728 ADS 11484 BD BD+11 3518
Distance 223.21 Distance ly 728.11
 
 
ORBITAL ELEMENTS
 
 
Period (P)411.1y Periastron (T)1968.324y Semi-major axis (a)0.511a
Eccentricity (e)0.317 Inclination (i)124.8° Longitude of periastron (ω)321.9°
Node (Ω)93.8° Notesn ReferenceSca2011a
Equinox2000 Last observation2009 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 85.4 0.377
2001 84.5 0.378
2002 83.6 0.378
2003 82.8 0.378
2004 81.9 0.378
2005 81.0 0.378
2006 80.2 0.378
2007 79.3 0.377
2008 78.4 0.377
2009 77.6 0.376
2010 76.7 0.376
2011 75.8 0.375
2012 74.9 0.374
2013 74.0 0.373
2014 73.1 0.373
2015 72.2 0.372
2016 71.3 0.370
2017 70.4 0.369
2018 69.5 0.368
2019 68.6 0.367
2020 67.7 0.366
2021 66.8 0.364
2022 65.8 0.363
2023 64.9 0.362
2024 63.9 0.360
2025 63.0 0.359
2026 62.0 0.357
2027 61.0 0.356
2028 60.1 0.354
2029 59.1 0.353
2030 58.1 0.351


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


 
  


wds18360%2B1144b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic