17305-1446 HU 177 (HD 158561)

 
 
17h 30m 32.15s -14° 46' 21.3" P.A. 172.00 sep 0.3 mag 8.50,9.60 Sp F0V dist. 197.63 pc (644.67 l.y.)
 
 
Coord 2000 17305-1446 Discov num HU  177 Comp Coord arcsec 2000 17 30 32.15 -14 46 21.3
Date first 1900 Date last 2018 Obs 17
Pa first 85 Pa last 171.5 P.A. Now (θ) 171.5°
Sep first 0.4 Sep last 0.273 Sep. Now (ρ) 0.273"
Mag pri 8.50 Mag sec 9.60 delta mag (ΔM) 1.1 Spectral class F0V (yellow-white)
Pri motion ra -002 Sec motion ra
Pri motion dec +003 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 158561 Constellation Serpens SAO 160594 HIP 85679
Tycho2 5671-00844-1 Gaia DR2 4137248232844261632 HD 158561 ADS 10595
BD BD-14 4665 Distance 197.63 Distance ly 644.67
 
 
ORBITAL ELEMENTS
 
 
Period (P)220.41y Periastron (T)1987.21y Semi-major axis (a)0.293a
Eccentricity (e)0.541 Inclination (i)156.3° Longitude of periastron (ω)252.6°
Node (Ω)179.5° Notes ReferenceMsn2017a
Equinox2000 Last observation2015 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 215.1 0.169
2001 211.4 0.175
2002 208.0 0.180
2003 204.8 0.186
2004 201.8 0.192
2005 199.0 0.198
2006 196.3 0.204
2007 193.8 0.210
2008 191.4 0.215
2009 189.1 0.221
2010 186.9 0.227
2011 184.9 0.232
2012 182.9 0.237
2013 181.1 0.243
2014 179.3 0.248
2015 177.5 0.253
2016 175.9 0.258
2017 174.3 0.263
2018 172.8 0.268
2019 171.3 0.272
2020 169.9 0.277
2021 168.5 0.281
2022 167.1 0.286
2023 165.8 0.290
2024 164.6 0.294
2025 163.3 0.298
2026 162.1 0.302
2027 161.0 0.306
2028 159.8 0.310
2029 158.7 0.314
2030 157.6 0.317


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



 
 


wds17305-1446a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic