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[vsnet-obs 7031] BL Lac CCD Obs Aug 20/21 (Tonny Vanmunster)



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PHOTOMETRIC CCD OBSERVATIONS OF BL Lac
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CENTER FOR BACKYARD ASTROPHYSICS  (CBA) BELGIUM
Observer   :    Tonny Vanmunster, Landen, Belgium
                Internet: tvanmuns@innet.be
Instruments:    0.25-m f/6.3 SCT , ST-7 SBIG CCD
                unfiltered exposures (50s)
Differential magnitudes
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Observations for August 20/21, 1997 [some clouds, strong moonlight]

COMP1 = GSC 3206 1047 mag 12.8 approx 25" E of variable

MID-INT.      VAR-COMP1
TIME (JD)

681.3783        1.32
681.3792        1.21
681.3802        1.23
681.3811        1.27
681.3820        1.30
681.3829        1.34
681.3839        1.27
681.3848        1.17
681.3857        1.17
681.3866        1.27
681.3876        1.28
681.3885        1.17
681.3894        1.14
681.3903        1.23
681.3913        1.27
681.3922        1.11
681.3931        1.18
681.3940        1.15
681.3950        1.13
681.3959        1.10
681.3968        1.12
681.3977        1.12
681.3987        1.06
681.3996        1.07
681.4005        1.05
681.4015        1.09
681.4024        1.07
681.4033        1.05
681.4042        1.01
681.4052        1.03
681.4061        1.04
681.4070        1.02
681.4079        1.05
681.4089        0.96
681.4098        1.04
681.4107        1.00
681.4116        1.08
681.4126        1.03
681.4144        1.05
681.4163        1.06
681.4172        1.11
681.4181        1.14
681.4200        1.12
681.4209        1.13
681.4218        1.13
681.4227        1.06
681.4237        1.11
681.4255        1.02
681.4265        1.13
681.4283        1.07
681.4292        1.10
681.4301        1.09
681.4311        0.99
681.4329        0.97
681.4348        0.80
681.4357        0.83
681.4366        0.81
681.4375        0.78
681.4385        0.83
681.4394        0.83
681.4403        0.84
681.4422        0.90
681.4431        0.89
681.4440        0.86
681.4450        0.89
681.4459        0.90
681.4468        0.94
681.4477        0.91
681.4487        0.93
681.4496        0.95
681.4505        0.89
681.4514        0.96
681.4524        0.87
681.4542        0.90
681.4551        0.94
681.4561        0.92
681.4570        1.00
681.4588        1.02
681.4598        1.00
681.4616        1.01
681.4625        1.04
681.4635        1.02
681.4644        1.08
681.4653        1.10
681.4662        1.06
681.4672        1.05
681.4681        1.02
681.4690        0.99
681.4700        1.04
681.4709        0.99
681.4718        0.98
681.4727        0.98
681.4736        1.03
681.4746        1.03
681.4755        1.04
681.4764        1.04
681.4773        1.04
681.4783        1.00
681.4792        1.00
681.4801        1.01
681.4811        0.98
681.4820        0.97
681.4829        0.96
681.4838        0.96
681.4847        0.93
681.4857        0.97
681.4866        1.00
681.4894        1.05
681.4912        1.06
681.4931        0.97
681.4949        1.04
681.4959        1.09
681.4977        1.02
681.4986        1.07
681.4996        0.99
681.5005        1.08
681.5014        0.98
681.5024        1.00
681.5033        1.00
681.5042        1.13
681.5070        1.12
681.5079        1.16
681.5088        1.10
681.5107        1.15
681.5116        1.11
681.5126        1.15
681.5135        1.19
681.5144        1.09
681.5153        1.16
681.5218        1.23
681.5227        1.21
681.5236        1.16
681.5245        1.32
681.5255        1.20
681.5264        1.21
681.5273        1.21
681.5283        1.19
681.5311        1.31
681.5320        1.33
681.5338        1.24
681.5348        1.21
681.5366        1.31
681.5375        1.26
681.5384        1.25
681.5394        1.31
681.5403        1.28
681.5412        1.29
681.5422        1.30
681.5468        1.29
681.5477        1.19
681.5486        1.23
681.5496        1.22
681.5505        1.13
681.5514        1.18
681.5523        1.21
681.5532        1.20
681.5542        1.35
681.5560        1.20
681.5570        1.30
681.5607        1.19
681.5616        1.19
681.5625        1.30
681.5634        1.26
681.5718        1.09
681.5727        1.15
681.5847        1.07
681.5856        1.07
681.5866        1.16
681.5875        1.18
681.5884        1.13
681.5893        1.18
681.5903        1.14
681.5912        1.20
681.5921        1.18
681.5930        1.13
681.5940        1.15
681.6069        1.13
681.6079        1.17
681.6088        1.17
681.6097        1.04
681.6106        1.11
681.6116        1.12
681.6125        1.15
681.6134        1.09
681.6143        1.15
681.6162        1.04
681.6180        1.12
681.6199        1.11

EOF