18092-2211 RST3157

 
 
18h 09m 12.18s -22 11' 00.6" P.A. 61.9 sep 0.19 mag 9.58,9.92 Sp K3/4V dist. 32.8 pc (106.99 l.y.)
 
 
Coord 2000
18092-2211
Discov num
RST3157
Comp
Coord arcsec 2000
18 09 12.18 -22 11 00.6
Date first
1935
Date last
2017
Obs
29
Pa first
109
Pa last
68
P.A. Now (θ)
61.9°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.19"
Mag pri
9.58
Mag sec
9.92
delta mag (ΔM)
0.34
Spectral class
K3/4V (yellow-orange)
Pri motion ra
-015
Sec motion ra
Pri motion dec
-085
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
68.3
Precise sep
0.166
Cdsa2 id
RST 3157
Constellation
Sagittarius
SAO
186363
HIP
88932
Tycho2
6276-00651-1
HD
165893
BD
BD-22 4584
CD
CD-2212617
CP
CP-22 6736
Ra deg
18.15338333333333
De deg
-22.1835
Distance
32.8
Distance ly
106.99
last precise pa
68.3
last precise sep
0.166
 
 
ORBITAL ELEMENTS
 
 
Period (P)10.685y± 0.045 Periastron (T)2015.031y± 0.02 Semi-major axis (a)0.1575a± 0.0019
Eccentricity (e)0.409± 0.008 Inclination (i)50.2°± 1.2 Longitude of periastron (ω)55.5°± 1.3
Node (Ω)232.4°± 1.3 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.148 114.4
2001 0.128 140.4
2002 0.119 173.2
2003 0.118 207.7
2004 0.091 249.6
2005 0.072 349.9
2006 0.139 38.5
2007 0.180 57.4
2008 0.192 71.2
2009 0.184 84.8
2010 0.165 100.7
2011 0.141 121.7
2012 0.123 150.2
2013 0.119 184.1
2014 0.115 219.0
2015 0.074 272.5
2016 0.093 13.1
2017 0.156 45.6
2018 0.186 61.9
2019 0.191 75.4
2020 0.179 89.4
2021 0.157 106.7
2022 0.134 129.8
2023 0.120 160.6
2024 0.119 195.0
2025 0.107 231.4
2026 0.062 307.1
2027 0.116 27.4
2028 0.169 51.4
2029 0.190 66.3
2030 0.189 79.6

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

grafico orbita





wds18092-2211a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18092-2211 RST3157 1991 23 171 0.1 9.58 9.92 K3/4V NO 180912.18-221100.6
18092-2211 RST3157 2009 24 89 0.2 9.58 9.92 K3/4V NO 180912.18-221100.6
18092-2211 RST3157 2013 25 209 0.1 9.58 9.92 K3/4V NO 180912.18-221100.6
18092-2211 RST3157 2014 27 255 0.1 9.58 9.92 K3/4V NO 180912.18-221100.6
18092-2211 RST3157 2015 28 310 0.1 9.58 9.92 K3/4V NO 180912.18-221100.6
18092-2211 RST3157 2017 29 68 0.2 9.58 9.92 K3/4V NO 180912.18-221100.6

If you need more information about this double, apply for a data request form to the WDS.