CCD:
FULL 13'x13'armin  

READOUT:
ONE AMP            

GAIN INDEX:
1: Read Noise ~ 1.5

FILTER SET:
UBVRI plus ND3


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NOTES FOR TARGET FIELDS
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1. The observing run consists of V-band photometric monitoring of the
   variable B-type star HD 175362 (V=5.351). Stars in the surrounding
   field will be used as comparison objects. 

2. Because of the large (~6 magnitudes) contrast difference between 
   target and comparison stars, the ND3 neutral density filter will be 
   used for alternate frames. So, the filter sequence should be V+ND3, 
   V, V+ND3, V, ...

3. All target frames (both V+ND3 and V-only) should use the same
   exposure time. Due to recent cleaning of the 0.9m mirror, it's not
   clear what the optimum exposure time should be. Therefore, on the
   first night, please take 6 exploratory frames of the target field,
   with the V+ND3 filters and with exposure times 15, 30, 45, 60, 75, 90 
   seconds. Choose the exposure time that gives a peak counts on HD 175362 
   closest to 32,000. Use this chosen exposure time for both ND3+V frames 
   *and* the V-only frames.

4. As the night progresses (and HD 175362 continues to rise), the
   exposure time may need to be shortened to prevent saturation in V+ND3
   frames (it does not matter that HD 175362 saturates in the V-only
   frames). Likewise, later in the night (as HD 175362 starts to set),
   the exposure time may have to be lengthened. Ideally, in all V+ND3
   frames, the peak counts on HD 175362 should not be allowed to rise above 
   42,000, and likewise should not be allowed to drop below 22,0000.

5. Don't worry if you don't get the first night completely right -- use
   any mistakes from the first night to help later nights run smoothly!

*** IMPORTANT *** 

counts on HD 175362 should not be allowed to rise above 42,000, and
likewise should not be allowed to drop below 22,0000.


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NOTES FOR CALIBRATION FIELDS
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1. Please obtain 11 bias frames and 11 V-filter flat field frames
   at the start of each night.

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OBSERVING SEQUENCE
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TARGET          hd_175362
PRIORITY        1
COORDINATES     18 56 40.50   -37 20 35.7 (epoch 2000)
FINDER CHART    http://simbad.u-strasbg.fr/Plot.pl?Radius=30&Radius.unit=arcmin&Coo=18+56+40.50+-37+20+35.7&CooEpoch=2000.0
AIRMASS         less than 2.5
FILTER(S)       ND3+V, V, ND3+V, V, ND3+V, V, ... (alternating; see target note 2)
INTEGRATION(S)  See target notes 3,4 & 5
TOTAL TIME      Continuous monitoring
NOTES           require photometric conditions
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