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
Constellation
Hercules
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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