18480-1009 HDS 2665 (HD 173872)

 
 
18h 48m 01.45s -10° 08' 44.7" P.A. 194.00 sep 0.3 mag 8.64,11.83 Sp K0 dist. 27.79 pc (90.65 l.y.)
 
 
Coord 2000 18480-1009 Discov num HDS2665 Comp Coord arcsec 2000 18 48 01.45 -10 08 44.7
Date first 1991 Date last 2021 Obs 13
Pa first 359 Pa last 194 P.A. Now (θ) 194°
Sep first 0.3 Sep last 0.294 Sep. Now (ρ) 0.294"
Mag pri 8.64 Mag sec 11.83 delta mag (ΔM) 3.19 Spectral class K0 (yellow-orange)
Pri motion ra +058 Sec motion ra
Pri motion dec -229 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 173872 Constellation Scutum SAO 161841 HIP 92250
Tycho2 5697-01175-1 Gaia DR2 4203266415630921472 HD 173872 BD BD-10 4804
Distance 27.79 Distance ly 90.65
 
 
ORBITAL ELEMENTS
 
 
Period (P)38.44y± 1.22 Periastron (T)2023.47y± 0.3 Semi-major axis (a)0.4796a± 0.0058
Eccentricity (e)0.411± 0.038 Inclination (i)56.4°± 0.7 Longitude of periastron (ω)195.7°± 5.5
Node (Ω)36.4°± 2.4 Notes ReferenceTok2020e
Equinox Last observation Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 34.8 0.652
2001 37.3 0.663
2002 39.7 0.667
2003 42.2 0.667
2004 44.6 0.661
2005 47.1 0.651
2006 49.8 0.635
2007 52.5 0.615
2008 55.5 0.590
2009 58.8 0.561
2010 62.5 0.528
2011 66.7 0.491
2012 71.6 0.451
2013 77.5 0.408
2014 84.8 0.365
2015 94.0 0.323
2016 105.9 0.284
2017 121.0 0.255
2018 139.0 0.239
2019 158.2 0.240
2020 176.1 0.254
2021 191.7 0.274
2022 205.5 0.287
2023 218.7 0.284
2024 233.2 0.261
2025 251.6 0.226
2026 276.3 0.198
2027 304.9 0.198
2028 329.4 0.229
2029 346.5 0.280
2030 358.0 0.337


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


 
  


wds18480-1009c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic