18386+1632 HO   87AB

 
 
18H 38M 36.74S +16 32' 27.7" P.A. 94.9 SEP 0.4 MAG 8.34,8.98 SP G5 DIST. 128.7 PC (419.82 L.Y.)
 
 
Coord 2000
18386+1632
Discov num
HO   87
Comp
AB
Coord arcsec 2000
18 38 36.74 +16 32 27.7
Date first
1883
Date last
2015
Obs
105
Pa first
259
Pa last
91
P.A. Now (θ)
94.9°
Sep first
0.3
Sep last
0.4
Sep. Now (ρ)
0.4"
Mag pri
8.34
Mag sec
8.98
delta mag (ΔM)
0.64
Spectral class
G5 (yellow)
Pri motion ra
-051
Sec motion ra
Pri motion dec
-063
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18386+1632 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 103945 18386+1632 HO 87 AB 1883 2015 105 95 0.4 8.34 8.98 0.64 Y <===
Show 103945 18386+1632 HO 87 AC 1893 2013 5 121 48.0 8.34 14.17 5.83
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
103945
HIP
91413
Tycho2
1570-02103-1
HD
172246
ADS
11530
BD
BD+16 3572
Distance
128.7
Distance ly
419.82
last precise pa
91.4
last precise sep
0.439
 
 
ORBITAL ELEMENTS
 
 
Period (P)118.57y Periastron (T)1972.73y Semi-major axis (a)0.31a
Eccentricity (e)0.62 Inclination (i)34.2° Longitude of periastron (ω)269°
Node (Ω)21.8° Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation1997
label rho theta
2000 0.348 71.2
2001 0.352 72.8
2002 0.357 74.3
2003 0.361 75.8
2004 0.365 77.2
2005 0.369 78.6
2006 0.373 80.0
2007 0.376 81.3
2008 0.379 82.7
2009 0.383 84.0
2010 0.386 85.2
2011 0.388 86.5
2012 0.391 87.8
2013 0.394 89.0
2014 0.396 90.2
2015 0.398 91.4
2016 0.400 92.6
2017 0.402 93.8
2018 0.404 94.9
2019 0.406 96.1
2020 0.407 97.2
2021 0.408 98.4
2022 0.410 99.5
2023 0.411 100.6
2024 0.412 101.7
2025 0.413 102.9
2026 0.413 104.0
2027 0.414 105.1
2028 0.415 106.2
2029 0.415 107.3
2030 0.415 108.4

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