18421+3445 B  2546Aa,Ab

 
 
18h 42m 08.09s +34 44' 46.7" P.A. 28.8 sep 0.11 mag 6.50,7.50 Sp B5V dist. 456.62 pc (1489.49 l.y.)
 
 
Coord 2000
18421+3445
Discov num
B  2546
Comp
Aa,Ab
Coord arcsec 2000
18 42 08.09 +34 44 46.7
Date first
1958
Date last
2006
Obs
43
Pa first
254
Pa last
353
P.A. Now (θ)
28.8°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.11"
Mag pri
6.50
Mag sec
7.50
delta mag (ΔM)
1
Spectral class
B5V (blue-white)
Pri motion ra
-003
Sec motion ra
Pri motion dec
-001
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
18421+3445 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 67265 18421+3445 B 2546 Aa,Ab 1958 2006 43 29 0.1 6.50 7.50 1.00 Y <===
Show 67265 18421+3445 STF2372 AB 1782 2016 74 82 25.2 6.45 7.73 1.28
Show 67265 18421+3445 BLL 34 AC 1894 2013 9 69 114.0 6.45 11.79 5.34
Show 67266 18421+3445 BLL 34 BC 1879 2013 11 65 90.1 7.73 11.79 4.06
Quadruple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
352.9
Precise sep
0.122
Constellation
Lyra
SAO
67265
HIP
91707
Tycho2
2645-02013-1
HD
173087
HR
7033
ADS
11593
BD
BD+34 3285
Distance
456.62
Distance ly
1489.49
last precise pa
352.9
last precise sep
0.122
 
 
ORBITAL ELEMENTS
 
 
Period (P)111.5y Periastron (T)2030.1y Semi-major axis (a)0.133a
Eccentricity (e)0.383 Inclination (i)36.4° Longitude of periastron (ω)58°
Node (Ω)49.8° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1996
label rho theta
2000 0.127 335.4
2001 0.126 338.1
2002 0.125 340.8
2003 0.124 343.5
2004 0.122 346.4
2005 0.121 349.2
2006 0.120 352.1
2007 0.119 355.1
2008 0.118 358.2
2009 0.116 1.3
2010 0.115 4.4
2011 0.114 7.7
2012 0.113 11.0
2013 0.111 14.3
2014 0.110 17.8
2015 0.108 21.4
2016 0.107 25.0
2017 0.105 28.8
2018 0.103 32.7
2019 0.101 36.8
2020 0.099 41.0
2021 0.097 45.4
2022 0.094 50.1
2023 0.091 55.0
2024 0.089 60.3
2025 0.086 65.9
2026 0.082 71.9
2027 0.079 78.4
2028 0.076 85.4
2029 0.073 93.0
2030 0.071 101.1

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

grafico orbita





wds18421%2B3445a.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
18421+3445 B 2546 Aa,Ab 1996 42 147 0.1 6.50 7.50 B5V NOD 184208.09+344446.7
18421+3445 B 2546 Aa,Ab 2006 43 353 0.1 6.50 7.50 B5V NOD 184208.09+344446.7

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