18464-2755 RST 2073 (HD 173428)

 
 
18h 46m 19.73s -27° 54' 57.6" P.A. 149.00 sep 0.4 mag 10.10,10.10 Sp G2V
 
 
Coord 2000 18464-2755 Discov num RST2073 Comp Coord arcsec 2000 18 46 19.73 -27 54 57.6
Date first 1931 Date last 2018 Obs 10
Pa first 57 Pa last 149.4 P.A. Now (θ) 145.1°
Sep first 0.3 Sep last 0.35 Sep. Now (ρ) 0.388"
Mag pri 10.10 Mag sec 10.10 delta mag (ΔM) 0 Spectral class G2V (yellow)
Pri motion ra +018 Sec motion ra
Pri motion dec +014 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 173428 Constellation Sagittarius Tycho2 6867-01366-1 HD 173428
 
 
ORBITAL ELEMENTS
 
 
Period (P)243.5y± 13.5 Periastron (T)1983y± 0.28 Semi-major axis (a)0.406a± 0.015
Eccentricity (e)0.544± 0.03 Inclination (i)128°± 1.5 Longitude of periastron (ω)214°± 3
Node (Ω)130.6°± 2.5 Notes ReferenceDoc2018l
Equinox2000 Last observation2018 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 185.7 0.179
2001 181.9 0.188
2002 178.6 0.198
2003 175.5 0.208
2004 172.7 0.217
2005 170.2 0.227
2006 167.8 0.237
2007 165.7 0.247
2008 163.7 0.257
2009 161.9 0.267
2010 160.2 0.276
2011 158.6 0.286
2012 157.1 0.295
2013 155.7 0.305
2014 154.4 0.314
2015 153.1 0.323
2016 151.9 0.331
2017 150.8 0.340
2018 149.8 0.348
2019 148.7 0.357
2020 147.8 0.365
2021 146.8 0.372
2022 146.0 0.380
2023 145.1 0.388
2024 144.3 0.395
2025 143.5 0.402
2026 142.7 0.409
2027 142.0 0.416
2028 141.3 0.423
2029 140.6 0.429
2030 139.9 0.436
2031 139.2 0.442
2032 138.6 0.448
2033 138.0 0.454
2034 137.4 0.460
2035 136.8 0.465
2036 136.2 0.471
2037 135.7 0.476
2038 135.1 0.481
2039 134.6 0.486
2040 134.0 0.491
2041 133.5 0.495
2042 133.0 0.500
2043 132.5 0.504
2044 132.0 0.509
2045 131.5 0.513
2046 131.1 0.517
2047 130.6 0.521
2048 130.1 0.524
2049 129.7 0.528
2050 129.2 0.531


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



 
 


wds18464-2755c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic