17115-1630 HU 169 (HD 155317)

 
 
17h 11m 29.58s -16° 29' 30.8" P.A. 181.00 sep 0.3 mag 8.61,8.12 Sp A4V dist. 120.63 pc (393.5 l.y.)
 
 
Coord 2000 17115-1630 Discov num HU  169 Comp Coord arcsec 2000 17 11 29.58 -16 29 30.8
Date first 1900 Date last 2018 Obs 27
Pa first 223 Pa last 181.2 P.A. Now (θ) 172.6°
Sep first 0.1 Sep last 0.265 Sep. Now (ρ) 0.254"
Mag pri 8.61 Mag sec 8.12 delta mag (ΔM) 0.49 Spectral class A4V (white)
Pri motion ra -011 Sec motion ra
Pri motion dec -003 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 155317 Constellation Ophiuchus SAO 160347 HIP 84092
Tycho2 6232-00807-1 Gaia DR2 4135708882188315776 HD 155317 ADS 10385
BD BD-16 4436 Distance 120.63 Distance ly 393.5
 
 
ORBITAL ELEMENTS
 
 
Period (P)79.08y± 0.08 Periastron (T)1992y± 0.2 Semi-major axis (a)0.223a± 0.005
Eccentricity (e)0.452± 0.006 Inclination (i)124.4°± 1 Longitude of periastron (ω)61.8°± 1
Node (Ω)22°± 1 Notesn ReferenceDoc2018l
Equinox2000 Last observation2018 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 222.5 0.152
2001 218.0 0.166
2002 214.2 0.180
2003 210.9 0.192
2004 208.0 0.203
2005 205.3 0.213
2006 202.9 0.222
2007 200.7 0.230
2008 198.6 0.237
2009 196.6 0.243
2010 194.7 0.248
2011 192.9 0.252
2012 191.1 0.255
2013 189.4 0.258
2014 187.7 0.260
2015 186.0 0.262
2016 184.4 0.262
2017 182.7 0.263
2018 181.1 0.262
2019 179.4 0.261
2020 177.7 0.260
2021 176.0 0.259
2022 174.3 0.257
2023 172.6 0.254
2024 170.8 0.251
2025 168.9 0.248
2026 167.1 0.245
2027 165.1 0.241
2028 163.1 0.237
2029 161.1 0.233
2030 159.0 0.229


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



 
 


wds17115-1630d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic