Statistical determination of the precision obtained by a photometric reduction algorithm

Numerical simulations were used to assess the multinight technique for UV by photometric data reduction. Observation sets were created for 1, 2, 4, 8 and 16 nights. The standard values were assumed to be accurate to 0.004 magn. and the error in the measurements was 0.006 magn. A total of 20 standard stars were kept, along with 20 constant stars, giving an average of 16 stars every night. Analysis shows that the multinight procedure leads to a dramatic improvement in the precision of the results.