18551+1717 COU 721AB

 
 
18h 55m 08.10s +17 17' 18.1" P.A. 302 sep 3.4 mag 9.30,11.40 Sp G0
 
 
Coord 2000
18551+1717
Discov num
COU 721
Comp
AB
Coord arcsec 2000
18 55 08.10 +17 17 18.1
Date first
1971
Date last
2007
Obs
3
Pa first
305
Pa last
302
P.A. Now (θ)
302°
Sep first
3.0
Sep last
3.4
Sep. Now (ρ)
3.4"
Mag pri
9.30
Mag sec
11.40
delta mag (ΔM)
2.1
Spectral class
G0 (yellow)
Pri motion ra
-019
Sec motion ra
Pri motion dec
-001
Sec motion dec
Notes
Nature of this double is uncertain.
 
 
18551+1717 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 18551+1717 COU 721 AB 1971 2007 3 302 3.4 9.30 11.40 2.10 <===
Show 18551+1717 COU 721 AC 1899 2015 8 149 17.5 9.30 11.00 1.70
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
302.1
Precise sep
3.39
Cdsa2 id
COU 721 AB
Constellation
Hercules
Ra deg
18.918916666666668
De deg
17.28836111111111
last precise pa
302.1
last precise sep
3.39
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18551+1717 COU 721 AB 2007 3 302 3.4 9.30 11.40 G0 185508.10+171718.1

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