18517+4323 BU  421AB

18h 51m 44.38s +43 23' 29.8" P.A. 297 sep 1.2 mag 9.80,9.89 Sp F8

Coord 2000
18517+4323
Discov num
BU  421
Comp
AB
Coord arcsec 2000
18 51 44.38 +43 23 29.8
Date first
1877
Date last
2017
Obs
19
Pa first
290
Pa last
297
P.A. Now (θ)
297°
Sep first
1.0
Sep last
1.2
Sep. Now (ρ)
1.2"
Mag pri
9.80
Mag sec
9.89
delta mag (ΔM)
0.09
Spectral class
F8 (yellow-white)
Pri motion ra
+017
Sec motion ra
+017
Pri motion dec
+048
Sec motion dec
+048
Notes


Nature of this double is uncertain.



18517+4323 SYSTEM COMPONENTS

Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 18517+4323 BU 421 AB 1877 2017 19 297 1.2 9.80 9.89 0.09 <===
Show 18517+4323 BU 421 AB,C 1893 2017 16 227 43.1 9.80 9.61 0.19
Triple system
4 visible stars in this system



OTHER CATALOGS AND DESIGNATIONS

Precise pa
296.9
Precise sep
1.199
Constellation
Lyra
Tycho2
3131-00575-1
last precise pa
296.9
last precise sep
1.199




WDS HISTORIC DATA

coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18517+4323 BU 421 AB 1999 15 298 1.1 9.80 9.89 F8 185144.38+432329.8
18517+4323 BU 421 AB 2009 16 294 1.2 9.80 9.89 F8 185144.38+432329.8
18517+4323 BU 421 AB 2011 17 294 1.2 9.80 9.89 F8 185144.38+432329.8
18517+4323 BU 421 AB 2015 18 296 1.2 9.80 9.89 F8 185144.38+432329.8
18517+4323 BU 421 AB 2017 19 297 1.2 9.80 9.89 F8 185144.38+432329.8

If you need more information about this double, apply for a data request form to the WDS.