18355+2336 STT 359

 
 
18H 35M 30.40S +23 36' 19.9" P.A. 3.9 SEP 0.75 MAG 6.35,6.62 SP G9III-IV DIST. 144.3 PC (470.71 L.Y.)
 
 
Coord 2000
18355+2336
Discov num
STT 359
Comp
Coord arcsec 2000
18 35 30.40 +23 36 19.9
Date first
1843
Date last
2015
Obs
238
Pa first
0
Pa last
6
P.A. Now (θ)
3.9°
Sep first
0.9
Sep last
0.7
Sep. Now (ρ)
0.75"
Mag pri
6.35
Mag sec
6.62
delta mag (ΔM)
0.27
Spectral class
G9III-IV (yellow)
Pri motion ra
+005
Sec motion ra
+005
Pri motion dec
+003
Sec motion dec
+003
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
86224
HIP
91139
Tycho2
2107-00474-1
HD
171745
HR
6980
ADS
11479
BD
BD+23 3385
Distance
144.3
Distance ly
470.71
last precise pa
6.1
last precise sep
0.73
 
 
ORBITAL ELEMENTS
 
 
Period (P)219.3y± 8.8 Periastron (T)1929.081y± 0.54 Semi-major axis (a)0.425a± 0.014
Eccentricity (e)0.8393± 0.0066 Inclination (i)119.9°± 2 Longitude of periastron (ω)197.7°± 2.1
Node (Ω)10°± 1.2 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2006
label rho theta
2000 0.711 6.6
2001 0.714 6.4
2002 0.717 6.3
2003 0.720 6.1
2004 0.723 5.9
2005 0.726 5.8
2006 0.728 5.6
2007 0.731 5.5
2008 0.733 5.3
2009 0.735 5.2
2010 0.737 5.0
2011 0.739 4.9
2012 0.741 4.7
2013 0.743 4.6
2014 0.745 4.5
2015 0.746 4.3
2016 0.748 4.2
2017 0.749 4.0
2018 0.750 3.9
2019 0.751 3.7
2020 0.752 3.6
2021 0.753 3.5
2022 0.754 3.3
2023 0.755 3.2
2024 0.756 3.0
2025 0.756 2.9
2026 0.757 2.7
2027 0.757 2.6
2028 0.757 2.5
2029 0.757 2.3
2030 0.758 2.2

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