18253+4846 HU   66BC

 
 
18H 25M 18.20S +48 45' 42.5" P.A. 25.6 SEP 0.89 MAG 8.40,8.25 SP G5 DIST. 144.72 PC (472.08 L.Y.)
 
 
Coord 2000
18253+4846
Discov num
HU   66
Comp
BC
Coord arcsec 2000
18 25 18.20 +48 45 42.5
Date first
1898
Date last
2015
Obs
15
Pa first
223
Pa last
27
P.A. Now (θ)
25.6°
Sep first
0.5
Sep last
0.8
Sep. Now (ρ)
0.89"
Mag pri
8.40
Mag sec
8.25
delta mag (ΔM)
0.15
Spectral class
G5 (yellow)
Pri motion ra
+019
Sec motion ra
+019
Pri motion dec
+003
Sec motion dec
+004
Notes
N O (See Notes, Orbital solution)
rPM=0.052 (< 0.3, Physical double)
This double is physical.
 
 
18253+4846 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 47482 18253+4846 HU 66 AB 1883 2011 60 189 0.1 7.90 8.40 0.50 Y
Show 47482 18253+4846 STT 351 AC 1843 2015 91 26 0.8 7.90 8.25 0.35
Show 47482 18253+4846 HU 66 BC 1898 2015 15 26 0.9 8.40 8.25 0.15 Y <===
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Draco
SAO
47482
HIP
90284
Tycho2
3534-00302-1
HD
170109
ADS
11344
BD
BD+48 2692
Distance
144.72
Distance ly
472.08
last precise pa
26.6
last precise sep
0.82
 
 
ORBITAL ELEMENTS
 
 
Period (P)561.2y± 28.74 Periastron (T)2090.38y± 26.82 Semi-major axis (a)1.103a± 0.151
Eccentricity (e)0.637± 0.092 Inclination (i)108.9°± 1.6 Longitude of periastron (ω)92.7°± 2.4
Node (Ω)14.4°± 2 Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2002
label rho theta
2000 0.916 29.7
2001 0.915 29.5
2002 0.914 29.2
2003 0.913 29.0
2004 0.912 28.8
2005 0.911 28.5
2006 0.910 28.3
2007 0.908 28.0
2008 0.906 27.8
2009 0.905 27.6
2010 0.903 27.3
2011 0.901 27.1
2012 0.899 26.9
2013 0.897 26.6
2014 0.895 26.4
2015 0.893 26.1
2016 0.890 25.9
2017 0.888 25.6
2018 0.885 25.4
2019 0.882 25.1
2020 0.879 24.9
2021 0.876 24.6
2022 0.873 24.4
2023 0.870 24.1
2024 0.866 23.9
2025 0.862 23.6
2026 0.859 23.3
2027 0.855 23.1
2028 0.851 22.8
2029 0.846 22.5
2030 0.842 22.3

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