BP Vul

BP Vul = GSC 1644-2113, 9.95 V, +0.46 B-V
RA(2000) 20h 25m 33.3s, Decl +21o 02' 18"

Comp = GSC 1644-1837, 9.61 V, +0.80 B-V
RA(2000) 20h 25m 36.4s, Decl +21o 08' 23"

Check = GSC 1644-2101, 11.93 V, +0.68 B-V
RA(2000) 20h 23m 33.6s, Decl +20o 52' 11"

P = 1.940360 d
Min I = 50324.396 + PxE
Min II = 50325.334 + PxE

15' x 15' field centered on the variable:

 
Arne's calibration data:
	V   	B-V	V-R	R-I
C =	9.485	0.724	0.400	0.381
K =	11.829	0.528	0.299	0.328

Light elements for both minima are given because the orbit is a bit
eccentric and Min II is not quite at 0.5 phase of Min I.  Initial epochs are
based on recent spectroscopic conjunctions, not old catalogue elements, so
predictions should be fairly good.

A series of minima begins now:

Min I
52066.840, June 6, 8:10 UT 
52068.780, June 8, 6:43 UT 
52070.720, June 10, 5:17 UT 
52072.660, June 12, 3:50 UT 
52074.601, June 14, 2:25 UT 
52076.541, June 16, 0:59 UT 

Min II 
52065.837, June 5, 8:05 UT 
52067.777, June 7, 6:39 UT 
52069.718, June 9, 5:14 UT 
52071.658, June 11, 3:48 UT 
52073.598, June 13, 2:21 UT 
52075.539, June 15, 0:56 UT