18368-2617 RST3187AB

 
 
18H 36M 48.23S -26 17' 21.6" P.A. 55.5 SEP 0.09 MAG 8.47,8.96 SP G3V DIST. 46.43 PC (151.45 L.Y.)
 
 
Coord 2000
18368-2617
Discov num
RST3187
Comp
AB
Coord arcsec 2000
18 36 48.23 -26 17 21.6
Date first
1934
Date last
2015
Obs
18
Pa first
231
Pa last
1
P.A. Now (θ)
55.5°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.09"
Mag pri
8.47
Mag sec
8.96
delta mag (ΔM)
0.49
Spectral class
G3V (yellow)
Pri motion ra
-043
Sec motion ra
Pri motion dec
-040
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
18368-2617 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 187041 18368-2617 RST3187 AB 1934 2015 18 56 0.1 8.47 8.96 0.49 Y <===
Show 187041 18368-2617 RST3187 AC 1950 2010 7 41 12.6 8.47 13.80 5.33
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Sagittarius
SAO
187041
HIP
91253
Tycho2
6866-00039-1
HD
171595
CD
CD-2613320
CP
CP-26 6518
Distance
46.43
Distance ly
151.45
last precise pa
0.8
last precise sep
0.065
 
 
ORBITAL ELEMENTS
 
 
Period (P)18.37y± 0.18 Periastron (T)2017.3y± 0.16 Semi-major axis (a)0.1661a± 0.002
Eccentricity (e)0.364± 0.022 Inclination (i)70.1°± 0.8 Longitude of periastron (ω)7.2°± 2.9
Node (Ω)40.6°± 0.9 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.076 64.8
2001 0.047 118.1
2002 0.073 177.0
2003 0.118 196.9
2004 0.159 205.9
2005 0.191 211.5
2006 0.212 215.7
2007 0.224 219.3
2008 0.225 222.7
2009 0.217 226.1
2010 0.200 230.1
2011 0.174 234.9
2012 0.139 242.0
2013 0.099 254.3
2014 0.061 283.6
2015 0.055 343.7
2016 0.086 20.6
2017 0.106 38.5
2018 0.090 55.5
2019 0.053 91.9
2020 0.058 161.8
2021 0.102 191.7
2022 0.145 203.2
2023 0.180 209.7
2024 0.205 214.3
2025 0.221 218.0
2026 0.226 221.4
2027 0.222 224.8
2028 0.208 228.5
2029 0.185 233.0
2030 0.153 239.0

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic