18118+3327 B  2545AB

 
 
18h 11m 45.11s +33 26' 49.3" P.A. 282.9 sep 0.05 mag 6.50,6.80 Sp A3V dist. 237.53 pc (774.82 l.y.)
 
 
Coord 2000
18118+3327
Discov num
B  2545
Comp
AB
Coord arcsec 2000
18 11 45.11 +33 26 49.3
Date first
1958
Date last
2007
Obs
66
Pa first
233
Pa last
241
P.A. Now (θ)
282.9°
Sep first
0.1
Sep last
0.1
Sep. Now (ρ)
0.05"
Mag pri
6.50
Mag sec
6.80
delta mag (ΔM)
0.3
Spectral class
A3V (white)
Pri motion ra
+018
Sec motion ra
Pri motion dec
+015
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18118+3327 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 66733 18118+3327 B 2545 AB 1958 2007 66 283 0.0 6.50 6.80 0.30 Y <===
Show 66733 18118+3327 HO 82 AB,C 1885 2010 32 220 0.7 6.08 8.99 2.91
Triple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
240.7
Precise sep
0.104
Constellation
Hercules
SAO
66733
HIP
89156
Tycho2
2626-01763-1
HD
166988
HR
6814
ADS
11149
BD
BD+33 3044
Distance
237.53
Distance ly
774.82
last precise pa
240.7
last precise sep
0.104
 
 
ORBITAL ELEMENTS
 
 
Period (P)23.9y± 1 Periastron (T)1971.81y± 0.81 Semi-major axis (a)0.062a± 0.0005
Eccentricity (e)0.706± 0.055 Inclination (i)37.9°± 5.8 Longitude of periastron (ω)172.1°± 19
Node (Ω)244.1°± 19 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 0.066 206.9
2001 0.075 213.4
2002 0.084 218.5
2003 0.091 222.7
2004 0.096 226.5
2005 0.100 229.8
2006 0.103 232.9
2007 0.105 235.9
2008 0.105 238.8
2009 0.105 241.8
2010 0.103 244.8
2011 0.100 247.9
2012 0.095 251.3
2013 0.089 255.1
2014 0.082 259.5
2015 0.073 264.9
2016 0.062 272.1
2017 0.048 282.9
2018 0.033 303.3
2019 0.019 358.0
2020 0.019 94.2
2021 0.028 158.0
2022 0.042 185.1
2023 0.055 198.9
2024 0.067 207.6
2025 0.076 214.0
2026 0.084 219.0
2027 0.091 223.1
2028 0.097 226.8
2029 0.101 230.1
2030 0.103 233.2

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





wds18118%2B3327a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18118+3327 B 2545 AB 2001 64 43 0.1 6.50 6.80 A3V NOD 181145.11+332649.3
18118+3327 B 2545 AB 2006 65 239 0.1 6.50 6.80 A3V NOD 181145.11+332649.3
18118+3327 B 2545 AB 2007 66 241 0.1 6.50 6.80 A3V NOD 181145.11+332649.3

If you need more information about this double, apply for a data request form to the WDS.