17436+2237 HU 1285 (HD 161258)

 
 
17h 43m 38.76s +22° 36' 43.2" P.A. 211.00 sep 0.5 mag 8.88,9.17 Sp F5 dist. 156.74 pc (511.29 l.y.)
 
 
Coord 2000 17436+2237 Discov num HU 1285 Comp Coord arcsec 2000 17 43 38.76 +22 36 43.2
Date first 1905 Date last 2016 Obs 54
Pa first 252 Pa last 210.8 P.A. Now (θ) 210.8°
Sep first 0.4 Sep last 0.526 Sep. Now (ρ) 0.526"
Mag pri 8.88 Mag sec 9.17 delta mag (ΔM) 0.29 Spectral class F5 (yellow-white)
Pri motion ra -020 Sec motion ra -020
Pri motion dec -009 Sec motion dec -009
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 161258 Constellation Hercules SAO 85363 HIP 86756
Tycho2 2077-03605-1 Gaia DR2 4556430581265861248 HD 161258 ADS 10743
BD BD+22 3199 Distance 156.74 Distance ly 511.29
 
 
ORBITAL ELEMENTS
 
 
Period (P)825y Periastron (T)2040y Semi-major axis (a)1.38a
Eccentricity (e)0.791 Inclination (i)101.1° Longitude of periastron (ω)249.8°
Node (Ω)27.3° Notes ReferenceUSN2002
Equinox2000 Last observation1996 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 217.4 0.553
2001 217.1 0.551
2002 216.8 0.549
2003 216.4 0.547
2004 216.1 0.545
2005 215.8 0.542
2006 215.4 0.539
2007 215.1 0.536
2008 214.8 0.533
2009 214.4 0.529
2010 214.1 0.525
2011 213.7 0.521
2012 213.3 0.516
2013 213.0 0.511
2014 212.6 0.506
2015 212.2 0.500
2016 211.8 0.493
2017 211.4 0.487
2018 211.0 0.479
2019 210.5 0.472
2020 210.1 0.463
2021 209.6 0.454
2022 209.1 0.444
2023 208.6 0.434
2024 208.1 0.423
2025 207.5 0.411
2026 206.9 0.398
2027 206.3 0.384
2028 205.6 0.370
2029 204.9 0.354
2030 204.0 0.337


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


 
  


wds17436%2B2237a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic