16416+1513 USN 2

 
 
16h 41m 36.62s +15° 12' 37.0" P.A. 88.00 sep 0.1 mag 16.40,16.40 Sp DA+DA
 
 
Coord 2000 16416+1513 Discov num USN   2 Comp Coord arcsec 2000 16 41 36.62 +15 12 37.0
Date first 2008 Date last 2010 Obs 3
Pa first 276 Pa last 88.3 P.A. Now (θ) 88.3°
Sep first 0.0 Sep last 0.124 Sep. Now (ρ) 0.124"
Mag pri 16.40 Mag sec 16.40 delta mag (ΔM) 0 Spectral class DA+DA (white dwarf/white dwarf)
Pri motion ra +020 Sec motion ra
Pri motion dec -673 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Hercules
 
 
ORBITAL ELEMENTS
 
 
Period (P)4.03y± 0.018 Periastron (T)2008.54y± 0.03 Semi-major axis (a)98.76m± 5.65
Eccentricity (e)0.74± 0.032 Inclination (i)83.2°± 0.3 Longitude of periastron (ω)49.4°± 1.6
Node (Ω)91.6°± 0.3 Notesn ReferenceUSN2013b
Equinox2000 Last observation2012 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 38.4 0.014
2001 272.4 0.097
2002 277.1 0.128
2003 283.1 0.084
2004 26.0 0.012
2005 272.1 0.093
2006 277.0 0.128
2007 282.8 0.087
2008 12.0 0.012
2009 271.9 0.090
2010 276.9 0.129
2011 282.5 0.088
2012 357.6 0.012
2013 271.6 0.086
2014 276.8 0.129
2015 282.2 0.090
2016 344.5 0.013
2017 271.3 0.082
2018 276.6 0.129
2019 282.0 0.092
2020 333.6 0.015
2021 271.0 0.078
2022 276.5 0.130
2023 281.8 0.094
2024 325.0 0.016
2025 270.6 0.073
2026 276.4 0.130
2027 281.5 0.096
2028 318.2 0.019
2029 270.2 0.068
2030 276.3 0.130


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



 
 


wds16416%2B1513a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic