18003+2154 A  1374AB

 
 
18H 00M 17.93S +21 53' 47.5" P.A. 31.6 SEP 0.51 MAG 8.90,10.90 SP G0
 
 
Coord 2000
18003+2154
Discov num
A  1374
Comp
AB
Coord arcsec 2000
18 00 17.93 +21 53 47.5
Date first
1906
Date last
2015
Obs
24
Pa first
10
Pa last
213
P.A. Now (θ)
31.6°
Sep first
0.7
Sep last
0.5
Sep. Now (ρ)
0.51"
Mag pri
8.90
Mag sec
10.90
delta mag (ΔM)
2
Spectral class
G0 (yellow)
Pri motion ra
-030
Sec motion ra
Pri motion dec
+014
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18003+2154 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 85624 18003+2154 WSI 106 Aa,Ab 2007 2015 3 309 0.1 9.40 9.90 0.50
Show 85624 18003+2154 A 1374 AB 1906 2015 24 32 0.5 8.90 10.90 2.00 Y <===
Show 85624 18003+2154 LBU 6 AB,C 1894 2001 7 299 76.8 8.61 11.33 2.72
Quintuple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Hercules
SAO
85624
Tycho2
1566-01708-1
HD
341480
ADS
10971
last precise pa
213.2
last precise sep
0.472
 
 
ORBITAL ELEMENTS
 
 
Period (P)139.53y Periastron (T)1995.81y Semi-major axis (a)0.504a
Eccentricity (e)0.806 Inclination (i)136.7° Longitude of periastron (ω)76°
Node (Ω)249° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2015
label rho theta
2000 0.198 73.4
2001 0.229 67.2
2002 0.256 62.4
2003 0.282 58.5
2004 0.305 55.2
2005 0.326 52.4
2006 0.346 49.9
2007 0.365 47.6
2008 0.382 45.6
2009 0.398 43.8
2010 0.414 42.0
2011 0.429 40.5
2012 0.443 39.0
2013 0.456 37.6
2014 0.468 36.2
2015 0.480 35.0
2016 0.492 33.8
2017 0.502 32.7
2018 0.513 31.6
2019 0.523 30.5
2020 0.532 29.5
2021 0.541 28.5
2022 0.550 27.6
2023 0.558 26.6
2024 0.566 25.7
2025 0.574 24.9
2026 0.581 24.0
2027 0.588 23.2
2028 0.594 22.4
2029 0.601 21.6
2030 0.607 20.8

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