17161+2316 COU 315

 
 
17H 16M 07.60S +23 15' 36.9" P.A. 253.7 SEP 0.13 MAG 9.30,10.10 SP K0+K2 DIST. 250 PC (815.5 L.Y.)
 
 
Coord 2000
17161+2316
Discov num
COU 315
Comp
Coord arcsec 2000
17 16 07.60 +23 15 36.9
Date first
1968
Date last
2008
Obs
21
Pa first
163
Pa last
133
P.A. Now (θ)
253.7°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.13"
Mag pri
9.30
Mag sec
10.10
delta mag (ΔM)
0.8
Spectral class
K0+K2 (yellow-orange/yellow-orange)
Pri motion ra
-003
Sec motion ra
Pri motion dec
+014
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
84960
HIP
84468
Tycho2
2061-00874-1
BD
BD+23 3071
Distance
250
Distance ly
815.5
last precise pa
132.6
last precise sep
0.125
 
 
ORBITAL ELEMENTS
 
 
Period (P)90.5y± 1 Periastron (T)2012.83y± 0.05 Semi-major axis (a)0.506a± 0.005
Eccentricity (e)0.975± 0.004 Inclination (i)100.4°± 4 Longitude of periastron (ω)89.3°± 15
Node (Ω)103.4°± 4 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2007
label rho theta
2000 0.151 151.6
2001 0.149 149.8
2002 0.146 147.9
2003 0.143 146.0
2004 0.140 143.9
2005 0.136 141.8
2006 0.132 139.5
2007 0.126 137.0
2008 0.120 134.4
2009 0.113 131.3
2010 0.129 138.1
2011 0.090 123.5
2012 0.068 117.0
2013 0.033 280.5
2014 0.080 268.0
2015 0.099 262.9
2016 0.112 259.2
2017 0.154 154.0
2018 0.130 253.7
2019 0.136 251.4
2020 0.142 249.3
2021 0.146 247.3
2022 0.150 245.5
2023 0.154 243.7
2024 0.157 242.0
2025 0.160 240.4
2026 0.163 238.8
2027 0.165 237.3
2028 0.167 235.8
2029 0.169 234.4
2030 0.170 232.9

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