20511+5125 BU  155AB

 
 
20h 51m 05.41s +51 25' 01.7" P.A. 42 sep 0.7 mag 7.36,8.13 Sp A9IV
 
 
Coord 2000
20511+5125
Discov num
BU  155
Comp
AB
Coord arcsec 2000
20 51 05.41 +51 25 01.7
Date first
1873
Date last
2016
Obs
56
Pa first
40
Pa last
42
P.A. Now (θ)
42°
Sep first
0.6
Sep last
0.7
Sep. Now (ρ)
0.7"
Mag pri
7.36
Mag sec
8.13
delta mag (ΔM)
0.77
Spectral class
A9IV (white)
Pri motion ra
+040
Sec motion ra
+040
Pri motion dec
+041
Sec motion dec
+041
Notes
Nature of this double is uncertain.
 
 
20511+5125 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 20511+5125 BU 155 AB 1873 2016 56 42 0.7 7.36 8.13 0.77 <===
Show 20511+5125 BU 155 AC 1885 1999 7 40 15.3 7.36 12.60 5.24
Show 20511+5125 BU 155 AD 1880 2003 7 48 192.6 7.36 11.50 4.14
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
41.9
Precise sep
0.732
Constellation
Cygnus
Tycho2
3587-01042-1
HD
198834
last precise pa
41.9
last precise sep
0.732
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20511+5125 BU 155 AB 2005 56 38 0.7 7.36 8.13 A9IV D 205105.41+512501.7
20511+5125 BU 155 AB 2010 59 40 0.7 7.36 8.13 A9IV D 205105.41+512501.7
20511+5125 BU 155 AB 2011 60 39 0.7 7.36 8.13 A9IV 205105.41+512501.7
20511+5125 BU 155 AB 2013 54 38 0.7 7.36 8.13 A9IV 205105.41+512501.7
20511+5125 BU 155 AB 2014 55 38 0.7 7.36 8.13 A9IV 205105.41+512501.7
20511+5125 BU 155 AB 2016 56 42 0.7 7.36 8.13 A9IV 205105.41+512501.7

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