18253+4846 HU   66AB

 
 
18H 25M 18.20S +48 45' 42.5" P.A. 182.8 SEP 0.11 MAG 7.90,8.40 SP G5 DIST. 144.72 PC (472.08 L.Y.)
 
 
Coord 2000
18253+4846
Discov num
HU   66
Comp
AB
Coord arcsec 2000
18 25 18.20 +48 45 42.5
Date first
1883
Date last
2011
Obs
60
Pa first
24
Pa last
216
P.A. Now (θ)
182.8°
Sep first
0.5
Sep last
0.2
Sep. Now (ρ)
0.11"
Mag pri
7.90
Mag sec
8.40
delta mag (ΔM)
0.5
Spectral class
G5 (yellow)
Pri motion ra
+024
Sec motion ra
Pri motion dec
+003
Sec motion dec
Notes
N O (See Notes, Orbital solution)
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 60 183 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 25 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
215.9
last precise sep
0.213
 
 
ORBITAL ELEMENTS
 
 
Period (P)300y Periastron (T)2022y Semi-major axis (a)0.392a
Eccentricity (e)0.546 Inclination (i)123.2° Longitude of periastron (ω)269.6°
Node (Ω)59.7° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1995
label rho theta
2000 0.255 235.6
2001 0.248 234.3
2002 0.242 232.9
2003 0.235 231.4
2004 0.227 229.8
2005 0.220 228.1
2006 0.212 226.3
2007 0.204 224.3
2008 0.196 222.2
2009 0.188 219.9
2010 0.179 217.4
2011 0.170 214.6
2012 0.161 211.5
2013 0.152 208.1
2014 0.143 204.2
2015 0.135 199.8
2016 0.126 194.8
2017 0.119 189.2
2018 0.112 182.8
2019 0.106 175.7
2020 0.101 167.8
2021 0.099 159.3
2022 0.097 150.4
2023 0.098 141.6
2024 0.101 133.0
2025 0.105 125.0
2026 0.111 117.8
2027 0.118 111.3
2028 0.125 105.5
2029 0.134 100.5
2030 0.142 96.0

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