18421+3445 B 2546 Aa,Ab

 
 
18h 42m 08.09s +34° 44' 46.7" P.A. 24.00 sep 0.1 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 2016 Obs 45
Pa first 254 Pa last 24.4 P.A. Now (θ) 24.4°
Sep first 0.2 Sep last 0.124 Sep. Now (ρ) 0.124"
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 wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 67265 18 42 08 +34 44 47 B 2546 Aa,Ab 2016 45 24 0.1 6.50 7.50 1.00 Y <===
Show HD 173087 67265 18 42 08 +34 44 47 STF 2372 AB 2019 79 82 25.0 6.45 7.73 1.28
Show 67265 18 42 08 +34 44 47 BLL 34 AC 2013 9 69 114.0 6.45 11.79 5.34
Show 18 42 10 +34 44 50 BLL 34 BC 2015 16 65 91.1 7.73 11.79 4.06
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Lyra SAO 67265 HIP 91707 Tycho2 2645-02013-1
Gaia DR2 2091774627937648256 HD 173087 HR 7033 ADS 11593
BD BD+34 3285 Distance 456.62 Distance ly 1489.49
 
 
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° Notesn ReferenceUSN2002
Equinox2000 Last observation1996 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 335.4 0.127
2001 338.1 0.126
2002 340.8 0.125
2003 343.5 0.124
2004 346.4 0.122
2005 349.2 0.121
2006 352.1 0.120
2007 355.1 0.119
2008 358.2 0.118
2009 1.3 0.116
2010 4.4 0.115
2011 7.7 0.114
2012 11.0 0.113
2013 14.3 0.111
2014 17.8 0.110
2015 21.4 0.108
2016 25.0 0.107
2017 28.8 0.105
2018 32.7 0.103
2019 36.8 0.101
2020 41.0 0.099
2021 45.4 0.097
2022 50.1 0.094
2023 55.0 0.091
2024 60.3 0.089
2025 65.9 0.086
2026 71.9 0.082
2027 78.4 0.079
2028 85.4 0.076
2029 93.0 0.073
2030 101.1 0.071


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



 
 


wds18421%2B3445a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic