18500+1519 YSC  12AB

 
 
18H 50M 02.00S +15 18' 40.3" P.A. 227 SEP 0.5 MAG 7.60,11.30 SP F8+M2V DIST. 53.22 PC (173.6 L.Y.)
 
 
Coord 2000
18500+1519
Discov num
YSC  12
Comp
AB
Coord arcsec 2000
18 50 02.00 +15 18 40.3
Date first
2001
Date last
2015
Obs
7
Pa first
77
Pa last
227
P.A. Now (θ)
227°
Sep first
0.4
Sep last
0.5
Sep. Now (ρ)
0.5"
Mag pri
7.60
Mag sec
11.30
delta mag (ΔM)
3.7
Spectral class
F8+M2V (yellow-white/red)
Pri motion ra
+102
Sec motion ra
Pri motion dec
+131
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18500+1519 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 18500+1519 YSC 12 AB 2001 2015 7 227 0.5 7.60 11.30 3.70 Y <===
Show 18500+1519 LLO 16 AC 1999 2001 2 19 11.1 5.99 13.30 7.31
Show 18500+1519 LLO 16 AD 1999 2001 2 228 15.0 5.99 13.50 7.51
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
HIP
92418
HD
174457
Distance
53.22
Distance ly
173.6
last precise pa
226.7
last precise sep
0.485
 
 
ORBITAL ELEMENTS
 
 
Period (P)840.8d (2.3y) Periastron (T)52020d (2001.302y) Semi-major axis (a)2.6m± 0.7
Eccentricity (e)0.23 Inclination (i)138.6°± 19.8 Longitude of periastron (ω)139°
Node (Ω)134.4°± 11.2 Note Grade9(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000-01-01 0.003 182.8
2001-01-01 0.002 72.2
2002-01-01 0.002 223.9
2003-01-01 0.003 119.4
2004-01-01 0.002 275.7
2005-01-01 0.003 146.5
2006-01-01 0.002 327.4
2007-01-01 0.003 173.0
2008-01-01 0.002 46.9
2009-01-01 0.002 209.4
2010-01-01 0.002 108.5
2011-01-01 0.002 259.6
2012-01-01 0.003 138.7
2013-01-01 0.002 310.4
2014-01-01 0.003 164.1
2015-01-01 0.002 18.3
2016-01-01 0.002 196.4
2017-01-01 0.002 94.9
2018-01-01 0.002 243.3
2019-01-01 0.003 130.5
2020-01-01 0.002 294.7
2021-01-01 0.003 156.0
2022-01-01 0.002 352.4
2023-01-01 0.003 185.0
2024-01-01 0.002 76.8
2025-01-01 0.002 227.3
2026-01-01 0.003 121.5
2027-01-01 0.002 279.1
2028-01-01 0.003 148.1
2029-01-01 0.002 331.4
2030-01-01 0.003 175.0

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