18413+3018 STF 2367 AB

 
 
18h 41m 16.36s +30° 17' 40.9" P.A. 73.00 sep 0.4 mag 7.70,8.03 Sp G3IV dist. 136.05 pc (443.8 l.y.)
 
 
Coord 2000 18413+3018 Discov num STF2367 Comp AB Coord arcsec 2000 18 41 16.36 +30 17 40.9
Date first 1833 Date last 2019 Obs 185
Pa first 68 Pa last 73.3 P.A. Now (θ) 71.2°
Sep first 0.4 Sep last 0.432 Sep. Now (ρ) 0.445"
Mag pri 7.70 Mag sec 8.03 delta mag (ΔM) 0.33 Spectral class G3IV (yellow)
Pri motion ra +004 Sec motion ra
Pri motion dec -040 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
18413+3018 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 67250 18 41 16 +30 17 41 STF 2367 AB 2019 185 73 0.4 7.70 8.03 0.33 Y <===
Show HD 172865 67250 18 41 16 +30 17 41 STF 2367 AB,C 2019 81 192 14.1 7.05 8.75 1.70
Show 67250 18 41 16 +30 17 41 STF 2367 AB,D 2007 3 84 21.9 7.05 12.00 4.95
Show 67250 18 41 16 +30 17 41 STF 2367 AB,E 2002 4 341 151.7 7.05 11.00 3.95
Show 67250 18 41 16 +30 17 41 BTG 2 AB,F 2007 3 173 42.4 7.05 15.10 8.05
Sextuple system
7 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Lyra SAO 67250 HIP 91636 Tycho2 2637-00713-1
Gaia DR2 4587747627368445952 HD 172865 GC 25575 ADS 11579
BD BD+30 3271 Distance 136.05 Distance ly 443.8
 
 
ORBITAL ELEMENTS
 
 
Period (P)92.2y± 0.41 Periastron (T)1980.82y± 0.015 Semi-major axis (a)0.239a± 0.0034
Eccentricity (e)0.91± 0.002 Inclination (i)121°± 1.6 Longitude of periastron (ω)348°± 1.7
Node (Ω)244°± 1.1 Notesn ReferencePbx2000b
Equinox Last observation Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 78.3 0.322
2001 77.8 0.331
2002 77.4 0.340
2003 77.0 0.349
2004 76.6 0.357
2005 76.2 0.364
2006 75.9 0.372
2007 75.6 0.379
2008 75.2 0.385
2009 74.9 0.392
2010 74.6 0.397
2011 74.3 0.403
2012 74.0 0.408
2013 73.7 0.413
2014 73.5 0.418
2015 73.2 0.422
2016 72.9 0.426
2017 72.7 0.429
2018 72.4 0.433
2019 72.2 0.436
2020 71.9 0.438
2021 71.7 0.441
2022 71.4 0.443
2023 71.2 0.445
2024 70.9 0.446
2025 70.7 0.448
2026 70.5 0.449
2027 70.2 0.449
2028 70.0 0.450
2029 69.8 0.450
2030 69.5 0.449


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



 
 


wds18413%2B3018a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic