18352+1812 CHR 74 (HD 171623)

 
 
18h 35m 12.59s +18° 12' 12.2" P.A. 25.00 sep 0.1 mag 5.78, Sp A0Vn dist. 198.41 pc (647.21 l.y.)
 
 
Coord 2000 18352+1812 Discov num CHR  74 Comp Coord arcsec 2000 18 35 12.59 +18 12 12.2
Date first 1985 Date last 2021 Obs 19
Pa first 212 Pa last 24.6 P.A. Now (θ) 24.6°
Sep first 0.2 Sep last 0.149 Sep. Now (ρ) 0.149"
Mag pri 5.78 Mag sec delta mag (ΔM) Spectral class A0Vn (white)
Pri motion ra +016 Sec motion ra
Pri motion dec +008 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 171623 Constellation Hercules SAO 103879 HIP 91118
Tycho2 1574-02056-1 Gaia DR2 4524091573480285696 HD 171623 HR 6977
GC 25398 BD BD+18 3740 Distance 198.41 Distance ly 647.21
 
 
ORBITAL ELEMENTS
 
 
Period (P)68.4y± 1.6 Periastron (T)2042.1y± 2.3 Semi-major axis (a)168.4m± 1.5
Eccentricity (e)0± 0.02 Inclination (i)116.6°± 0.6 Longitude of periastron (ω)139°± 12
Node (Ω)40.2°± 0.9 Notes ReferenceHor2015b
Equinox2000 Last observation2014 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 114.0 0.078
2001 103.5 0.082
2002 94.3 0.089
2003 86.4 0.096
2004 79.7 0.104
2005 74.0 0.113
2006 69.1 0.121
2007 64.9 0.129
2008 61.1 0.137
2009 57.7 0.144
2010 54.7 0.151
2011 51.8 0.156
2012 49.2 0.161
2013 46.6 0.164
2014 44.2 0.167
2015 41.8 0.168
2016 39.5 0.168
2017 37.1 0.167
2018 34.7 0.165
2019 32.2 0.162
2020 29.6 0.158
2021 26.8 0.153
2022 23.9 0.147
2023 20.6 0.140
2024 17.0 0.132
2025 12.9 0.124
2026 8.3 0.116
2027 2.9 0.107
2028 356.6 0.099
2029 349.2 0.091
2030 340.5 0.085


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



 
 


wds18352%2B1812a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic