18305-2848 HDS 2624 (HD 170415)

 
 
18h 30m 31.02s -28° 47' 42.9" P.A. 230.00 sep 0.1 mag 8.47,8.71 Sp A1IV/V dist. 158.98 pc (518.59 l.y.)
 
 
Coord 2000 18305-2848 Discov num HDS2624 Comp Coord arcsec 2000 18 30 31.02 -28 47 42.9
Date first 1991 Date last 2021 Obs 10
Pa first 197 Pa last 229.8 P.A. Now (θ) 226.3°
Sep first 0.1 Sep last 0.125 Sep. Now (ρ) 0.141"
Mag pri 8.47 Mag sec 8.71 delta mag (ΔM) 0.24 Spectral class A1IV/V (white)
Pri motion ra -008 Sec motion ra
Pri motion dec -016 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 170415 Constellation Sagittarius SAO 186892 HIP 90715
Tycho2 6869-00432-1 Gaia DR2 4048486716386440192 HD 170415 GC 25243
CD CD-2814648 CP CP-28 6576 Distance 158.98 Distance ly 518.59
 
 
ORBITAL ELEMENTS
 
 
Period (P)42.93y± 10.94 Periastron (T)2007.53y± 1.05 Semi-major axis (a)0.0979a± 0.0211
Eccentricity (e)0.531± 0.104 Inclination (i)144.5°± 33.2 Longitude of periastron (ω)14°± 24.7
Node (Ω)42.3°± 22.1 Notes ReferenceTok2015c
Equinox2000 Last observation2014 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 157.5 0.085
2001 149.1 0.077
2002 138.7 0.070
2003 125.9 0.062
2004 110.1 0.056
2005 91.1 0.052
2006 69.1 0.049
2007 44.7 0.047
2008 18.0 0.045
2009 349.6 0.044
2010 322.9 0.048
2011 301.6 0.055
2012 285.8 0.064
2013 274.1 0.074
2014 265.1 0.084
2015 258.0 0.093
2016 252.1 0.102
2017 247.1 0.109
2018 242.8 0.117
2019 238.9 0.123
2020 235.4 0.129
2021 232.2 0.133
2022 229.2 0.138
2023 226.3 0.141
2024 223.6 0.144
2025 220.9 0.146
2026 218.4 0.148
2027 215.8 0.148
2028 213.3 0.149
2029 210.8 0.148
2030 208.3 0.147


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



 
 


wds18305-2848a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic