18103-2913 HO 428 (HD 166080)

 
 
18h 10m 18.15s -29° 12' 47.4" P.A. 92.00 sep 0.4 mag 8.32,8.75 Sp A4V
 
 
Coord 2000 18103-2913 Discov num HO  428 Comp Coord arcsec 2000 18 10 18.15 -29 12 47.4
Date first 1893 Date last 2018 Obs 18
Pa first 80 Pa last 92.2 P.A. Now (θ) 92.2°
Sep first 0.7 Sep last 0.367 Sep. Now (ρ) 0.367"
Mag pri 8.32 Mag sec 8.75 delta mag (ΔM) 0.43 Spectral class A4V (white)
Pri motion ra +009 Sec motion ra +009
Pri motion dec -005 Sec motion dec -005
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 166080 Constellation Sagittarius SAO 186391 Tycho2 6855-02083-1
Gaia DR2 4050512158618448128 HD 166080 ADS 11112
 
 
ORBITAL ELEMENTS
 
 
Period (P)815y Periastron (T)2635y Semi-major axis (a)1.42a
Eccentricity (e)0.636 Inclination (i)87° Longitude of periastron (ω)288.4°
Node (Ω)80.2° Notes ReferenceUSN2002
Equinox2000 Last observation1991 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 90.4 0.504
2001 90.5 0.499
2002 90.7 0.494
2003 90.8 0.489
2004 91.0 0.484
2005 91.1 0.480
2006 91.3 0.475
2007 91.4 0.470
2008 91.6 0.465
2009 91.8 0.460
2010 91.9 0.455
2011 92.1 0.450
2012 92.3 0.444
2013 92.5 0.439
2014 92.7 0.434
2015 92.9 0.429
2016 93.1 0.424
2017 93.3 0.419
2018 93.5 0.414
2019 93.7 0.409
2020 93.9 0.404
2021 94.1 0.399
2022 94.4 0.394
2023 94.6 0.389
2024 94.8 0.384
2025 95.1 0.379
2026 95.3 0.373
2027 95.6 0.368
2028 95.9 0.363
2029 96.1 0.358
2030 96.4 0.353


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



 
 


wds18103-2913a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic