18352+1812 CHR  74

 
 
18H 35M 12.59S +18 12' 12.2" P.A. 34.7 SEP 0.17 MAG 5.78, SP A0VN DIST. 198.41 PC (647.21 L.Y.)
 
 
Coord 2000
18352+1812
Discov num
CHR  74
Comp
Coord arcsec 2000
18 35 12.59 +18 12 12.2
Date first
1985
Date last
2015
Obs
17
Pa first
212
Pa last
42
P.A. Now (θ)
34.7°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.17"
Mag pri
5.78
Mag sec
delta mag (ΔM)
Spectral class
A0Vn (white)
Pri motion ra
+016
Sec motion ra
Pri motion dec
+008
Sec motion dec
Notes
N (See Notes)
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
103879
HIP
91118
Tycho2
1574-02056-1
HD
171623
HR
6977
BD
BD+18 3740
Distance
198.41
Distance ly
647.21
last precise pa
41.7
last precise sep
0.167
 
 
ORBITAL ELEMENTS
 
 
Period (P)68.4y± 1.6 Periastron (T)2042.1y± 2.3 Semi-major axis (a)168.4m± 1.5
Eccentricity (e)0± 0.02 Inclination (i)116.6°± 0.6 Longitude of periastron (ω)139°± 12
Node (Ω)40.2°± 0.9 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 0.078 114.0
2001 0.082 103.5
2002 0.089 94.3
2003 0.096 86.4
2004 0.104 79.7
2005 0.113 74.0
2006 0.121 69.1
2007 0.129 64.9
2008 0.137 61.1
2009 0.144 57.7
2010 0.151 54.7
2011 0.156 51.8
2012 0.161 49.2
2013 0.164 46.6
2014 0.167 44.2
2015 0.168 41.8
2016 0.168 39.5
2017 0.167 37.1
2018 0.165 34.7
2019 0.162 32.2
2020 0.158 29.6
2021 0.153 26.8
2022 0.147 23.9
2023 0.140 20.6
2024 0.132 17.0
2025 0.124 12.9
2026 0.116 8.3
2027 0.107 2.9
2028 0.099 356.6
2029 0.091 349.2
2030 0.085 340.5

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