YALO Telescope Observer's Report for 2002 May 20

Observer: Juan Espinoza
Observed all night from 22:59 to 10:27 UTC.
Conditions were Mixed most of the night.
Problems were encountered, see the summary for details.

Seeing and Weather:
   Beg: Seeing 1.8 arcsec, Clear, Winds Light & Variable
   Mid: Seeing 2.2 arcsec, Cirrus, Winds Moderate
   End: Seeing 1.8 arcsec, Clear, Winds High

Observing Summary:


Hello,

Photometric program completed.  We started with very clear skies but we
had a thin strip of cloud pass over us at around 05:30 UT.  The rest of the
night remained very clear but very windy.

PG1323-A could not be observed for a third time due to telescope limits.

Differential magnitudes:

Cen X-4:    0.33
xte1550:    6.99
Aql X-1:    3.44
v4641:      1.52, 1.19, 1.21, 1.31, 1.52, 1.75, 1.32, 0.84

Magnitudes for V4641 were done on V band only, but all CCD frames
were trimmed as with most targets.

Because of the small (and somewhat useless) data, I am not sending
this week's data (only two tapes with mostly calibrations).  Data for
the night of 2002_0520 will be taped by David.  If its nescesary, please 
ask him to send it.

That is all from me for this week

cheers
juan

------------------------------

Submitted by Juan Espinoza on 2002 May 21 [6:53:55]