21009+4730 BU 1290BD

 
 
21H 00M 56.53S +47 29' 44.5" P.A. 21 SEP 2.5 MAG 10.65,15.00
 
 
Coord 2000
21009+4730
Discov num
BU 1290
Comp
BD
Coord arcsec 2000
21 00 56.53 +47 29 44.5
Date first
1898
Date last
2006
Obs
2
Pa first
25
Pa last
21
P.A. Now (θ)
21°
Sep first
2.4
Sep last
2.5
Sep. Now (ρ)
2.5"
Mag pri
10.65
Mag sec
15.00
delta mag (ΔM)
4.35
Spectral class
Pri motion ra
+041
Sec motion ra
Pri motion dec
+047
Sec motion dec
Notes
Nature of this double is uncertain.
 
 
21009+4730 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 21009+4730 BU 1290 AB 1898 2010 17 33 8.6 10.09 10.65 0.56
Show 21009+4730 BU 1290 AC 1898 2006 2 267 3.5 10.09 14.00 3.91
Show 21009+4730 BU 1290 BD 1898 2006 2 21 2.5 10.65 15.00 4.35 <===
Show 50388 21009+4730 BU 1290 CD 2006 2006 1 90 2.9 14.00 15.00 1.00
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Cygnus
Tycho2
3592-04619-2
last precise pa
21.2
last precise sep
2.51