18126-7340 HDO 284 AB (HD 165259)

 
 
18h 12m 34.05s -73° 40' 20.7" P.A. 273.00 sep 2.0 mag 5.96,9.14 Sp F5V dist. 42.14 pc (137.46 l.y.)
 
 
Coord 2000 18126-7340 Discov num HDO 284 Comp AB Coord arcsec 2000 18 12 34.05 -73 40 20.7
Date first 1891 Date last 2021 Obs 25
Pa first 210 Pa last 272.5 P.A. Now (θ) 272.5°
Sep first 1.0 Sep last 1.953 Sep. Now (ρ) 1.953"
Mag pri 5.96 Mag sec 9.14 delta mag (ΔM) 3.18 Spectral class F5V (yellow-white)
Pri motion ra -055 Sec motion ra -055
Pri motion dec -263 Sec motion dec -263
Notes O (Orbital solution)
This double is physical.
 
 
18126-7340 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 257571 18 12 34 -73 40 21 TOK 58 Aa,Ab 2021 10 97 0.3 5.90 9.60 3.70
Show HD 165259 257571 18 12 34 -73 40 21 HDO 284 AB 2021 25 273 2.0 5.96 9.14 3.18 Y <===
Triple system
2 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 165259 Constellation Apus SAO 257571 HIP 89234
Tycho2 9302-02069-1 Gaia DR2 6417978327725636096 HD 165259 HR 6751
GC 24731 CD CD-73 1348 CP CP-73 1888 Distance 42.14
Distance ly 137.46
 
 
ORBITAL ELEMENTS
 
 
Period (P)324.8y Periastron (T)2110.09y Semi-major axis (a)1.522a
Eccentricity (e)0.628 Inclination (i)15.9° Longitude of periastron (ω)
Node (Ω)62.6° Notes ReferenceLin2016b
Equinox2000 Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 264.8 2.277
2001 265.1 2.269
2002 265.5 2.261
2003 265.9 2.253
2004 266.3 2.245
2005 266.6 2.236
2006 267.0 2.228
2007 267.4 2.219
2008 267.8 2.210
2009 268.2 2.201
2010 268.6 2.192
2011 269.0 2.183
2012 269.4 2.173
2013 269.8 2.163
2014 270.2 2.154
2015 270.6 2.144
2016 271.1 2.133
2017 271.5 2.123
2018 271.9 2.113
2019 272.3 2.102
2020 272.8 2.091
2021 273.2 2.080
2022 273.7 2.069
2023 274.1 2.058
2024 274.6 2.046
2025 275.0 2.034
2026 275.5 2.022
2027 276.0 2.010
2028 276.5 1.998
2029 276.9 1.986
2030 277.4 1.973
2031 277.9 1.960
2032 278.4 1.947
2033 278.9 1.934
2034 279.5 1.921
2035 280.0 1.908
2036 280.5 1.894
2037 281.1 1.880
2038 281.6 1.866
2039 282.2 1.852
2040 282.7 1.837
2041 283.3 1.823
2042 283.9 1.808
2043 284.5 1.793
2044 285.1 1.778
2045 285.7 1.762
2046 286.3 1.747
2047 287.0 1.731
2048 287.6 1.715
2049 288.3 1.699
2050 288.9 1.682


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



 
 


wds18126-7340a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic