18166-2033 MCA 51 (17 Sgr)

 
 
18h 16m 35.37s -20° 32' 40.1" P.A. 318.00 sep 0.1 mag 7.24,8.89 Sp G5IV+A5 dist. 180.51 pc (588.82 l.y.)
 
 
Coord 2000 18166-2033 Discov num MCA  51 Comp Coord arcsec 2000 18 16 35.37 -20 32 40.1
Date first 1976 Date last 2022 Obs 20
Pa first 313 Pa last 317.9 P.A. Now (θ) 331.8° (calc)
Sep first 0.3 Sep last 0.054 Sep. Now (ρ) 0.027" (calc)
Mag pri 7.24 Mag sec 8.89 delta mag (ΔM) 1.65 Spectral class G5IV+A5 (yellow/white)
Pri motion ra +008 Sec motion ra
Pri motion dec -011 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 17 Sgr Constellation Sagittarius SAO 186575 HIP 89567
Tycho2 6273-01426-1 Gaia DR2 4094341269029556864 HD 167570 GC 24918
BD BD-20 5068 Flamsteed 17 Sagittarii Flamsteed name 17 Sgr Distance 180.51
Distance ly 588.82
 
 
ORBITAL ELEMENTS
 
 
Period (P)98.9y± 6.1 Periastron (T)2018.9y± 0.43 Semi-major axis (a)0.1707a± 0.0039
Eccentricity (e)0.6774± 0.0277 Inclination (i)85.8°± 0.9 Longitude of periastron (ω)152°± 6.1
Node (Ω)134.7°± 0.4 Notesn ReferenceTok2024e
Equinox2000 Last observation2024 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 135.3 0.201
2001 135.5 0.193
2002 135.6 0.186
2003 135.8 0.178
2004 136.0 0.169
2005 136.2 0.160
2006 136.4 0.150
2007 136.7 0.139
2008 137.0 0.127
2009 137.4 0.115
2010 137.9 0.102
2011 138.6 0.088
2012 139.5 0.073
2013 140.8 0.056
2014 143.4 0.039
2015 150.4 0.021
2016 215.4 0.005
2017 301.3 0.019
2018 309.6 0.036
2019 312.7 0.050
2020 314.7 0.058
2021 316.3 0.060
2022 317.9 0.057
2023 319.9 0.052
2024 322.3 0.044
2025 325.9 0.036
2026 331.8 0.027
2027 343.5 0.018
2028 12.6 0.011
2029 66.6 0.011
2030 97.4 0.018
2031 109.6 0.027
2032 115.6 0.036
2033 119.1 0.045
2034 121.5 0.054
2035 123.1 0.064
2036 124.4 0.073
2037 125.3 0.081
2038 126.1 0.090
2039 126.8 0.098
2040 127.3 0.107
2041 127.8 0.115
2042 128.2 0.122
2043 128.5 0.130
2044 128.9 0.137
2045 129.1 0.144
2046 129.4 0.151
2047 129.6 0.158
2048 129.9 0.165
2049 130.1 0.171
2050 130.3 0.177


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds18166-2033b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic