17326+3445 HU 1181 (HD 159304)

17h 32m 34.08s +34° 44' 47.6" P.A. 323.00 sep 0.1 mag 8.62,9.11 Sp G0 dist. 61.96 pc (202.11 l.y.)

Coord 2000 17326+3445 Discov num HU 1181 Comp Coord arcsec 2000 17 32 34.08 +34 44 47.6
Date first 1904 Date last 2012 Obs 45
Pa first 331 Pa last 323 P.A. Now (θ) 152.1°
Sep first 0.2 Sep last 0.113 Sep. Now (ρ) 0.182"
Mag pri 8.62 Mag sec 9.11 delta mag (ΔM) 0.49 Spectral class G0 (yellow)
Pri motion ra +037 Sec motion ra
Pri motion dec +005 Sec motion dec
Notes N O (See Notes, Orbital solution)




This double is physical.



OTHER CATALOGS AND DESIGNATIONS

Name HD 159304 Constellation Hercules SAO 66127 HIP 85846
Tycho2 2613-00891-1 Gaia DR2 1335897698512788224 HD 159304 GC 23786
ADS 10624 BD BD+34 2990 Distance 61.96 Distance ly 202.11




ORBITAL ELEMENTS

Period (P)23.3y Periastron (T)1992y Semi-major axis (a)0.16a
Eccentricity (e)0.26 Inclination (i)70° Longitude of periastron (ω)205°
Node (Ω)157° Notesn ReferenceSod1999
Equinox2000 Last observation Grade2(1=Definitive, 9=Indet.)

label theta rho
2000 153.3 0.186
2001 156.8 0.195
2002 160.2 0.197
2003 163.7 0.192
2004 167.4 0.180
2005 171.8 0.163
2006 177.5 0.142
2007 185.4 0.116
2008 198.0 0.089
2009 220.6 0.066
2010 257.3 0.057
2011 291.6 0.070
2012 311.9 0.093
2013 324.3 0.112
2014 333.7 0.121
2015 342.9 0.114
2016 355.2 0.091
2017 19.3 0.060
2018 72.6 0.047
2019 115.6 0.071
2020 133.1 0.106
2021 142.0 0.138
2022 147.7 0.164
2023 152.1 0.182
2024 155.8 0.193
2025 159.2 0.197
2026 162.6 0.194
2027 166.3 0.184
2028 170.4 0.169
2029 175.6 0.149
2030 182.6 0.124


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



 
 


wds17326%2B3445a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic