18126+1224 HDS 2570 (HD 166976)

 
 
18h 12m 35.69s +12° 23' 36.9" P.A. 13.00 sep 0.1 mag 8.04,8.88 Sp F0III+A6V dist. 226.24 pc (737.99 l.y.)
 
 
Coord 2000 18126+1224 Discov num HDS2570 Comp Coord arcsec 2000 18 12 35.69 +12 23 36.9
Date first 1991 Date last 2023 Obs 11
Pa first 139 Pa last 12.9 P.A. Now (θ) 12.9°
Sep first 0.2 Sep last 0.05 Sep. Now (ρ) 0.05"
Mag pri 8.04 Mag sec 8.88 delta mag (ΔM) 0.84 Spectral class F0III+A6V (yellow-white/white)
Pri motion ra +006 Sec motion ra
Pri motion dec +002 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 166976 Constellation Ophiuchus SAO 103481 HIP 89235
Tycho2 1017-01625-1 Gaia DR2 4496880653555218176 HD 166976 BD BD+12 3422
Distance 226.24 Distance ly 737.99
 
 
ORBITAL ELEMENTS
 
 
Period (P)85y Periastron (T)2009.87y Semi-major axis (a)0.158a
Eccentricity (e)0.45 Inclination (i)73° Longitude of periastron (ω)149.6°
Node (Ω)132.2° Notes ReferenceTok2020g
Equinox2000 Last observation2019 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 156.8 0.076
2001 162.5 0.063
2002 171.1 0.051
2003 184.8 0.040
2004 207.1 0.032
2005 237.1 0.030
2006 263.3 0.036
2007 280.2 0.046
2008 290.7 0.057
2009 297.8 0.068
2010 303.1 0.077
2011 307.3 0.084
2012 310.9 0.089
2013 314.3 0.092
2014 317.5 0.093
2015 320.7 0.091
2016 324.1 0.088
2017 327.8 0.084
2018 332.0 0.079
2019 336.7 0.073
2020 342.3 0.068
2021 348.9 0.062
2022 356.9 0.056
2023 6.4 0.052
2024 17.4 0.049
2025 29.5 0.047
2026 41.8 0.048
2027 53.5 0.050
2028 63.8 0.054
2029 72.4 0.059
2030 79.6 0.065
2031 85.5 0.072
2032 90.3 0.079
2033 94.4 0.086
2034 97.8 0.094
2035 100.7 0.101
2036 103.2 0.109
2037 105.4 0.116
2038 107.3 0.123
2039 109.0 0.130
2040 110.5 0.137
2041 111.9 0.144
2042 113.2 0.150
2043 114.4 0.156
2044 115.5 0.162
2045 116.5 0.168
2046 117.5 0.173
2047 118.4 0.178
2048 119.2 0.183
2049 120.0 0.188
2050 120.8 0.192


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds18126%2B1224a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic