20490+3947 STF 2731 AB (HD 198436)

 
 
20h 49m 00.64s +39° 47' 29.9" P.A. 86.00 sep 4.1 mag 7.65,9.59 Sp B9IV dist. 497.51 pc (1622.88 l.y.)
 
 
Coord 2000 20490+3947 Discov num STF2731 Comp AB Coord arcsec 2000 20 49 00.64 +39 47 29.9
Date first 1830 Date last 2016 Obs 26
Pa first 86 Pa last 86.4 P.A. Now (θ) 86.4°
Sep first 4.0 Sep last 4.126 Sep. Now (ρ) 4.126"
Mag pri 7.65 Mag sec 9.59 delta mag (ΔM) 1.94 Spectral class B9IV (blue-white)
Pri motion ra +005 Sec motion ra +005
Pri motion dec -003 Sec motion dec -003
Notes
Nature of this double is uncertain.
 
 
20490+3947 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 198436 70541 20 49 01 +39 47 30 STF 2731 AB 2016 26 86 4.1 7.65 9.59 1.94 <===
Show 70541 20 49 01 +39 47 30 HO 596 AC 2002 7 178 18.0 7.65 13.64 5.99
Show 70541 20 49 01 +39 47 30 HO 596 AD 2002 8 247 18.2 7.65 13.56 5.91
Quadruple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 198436 Constellation Cygnus SAO 70541 HIP 102731
Tycho2 3170-00189-1 Gaia DR2 2065019558668586624 HD 198436 GC 29031
ADS 14334 BD BD+39 4331 Distance 497.51 Distance ly 1622.88