============================================================================== File: 1999_U1-4_owen_nsdc.data.txt ================================== Contents: - 3 observations of U-1 on 1999 July 22 - 3 observations of U-2 on 1999 July 22 - 3 observations of U-3 on 1999 July 22 - 3 observations of U-4 on 1999 July 22 References: Observations communicated to NSDC by : W. M. Owen Jr., Jet Propulsion Laboratory 301-150, Pasadena CA 91109-8099 wmo@jpl.nasa.gov observatory code: 673 Comments: I came across these almost by accident ... some pictures taken by our software developer two years ago. In each case there were several exposures at the same pointing, and so the overlapping plate method loses much of its power. I had to reduce the data with the aid of calibration fields taken one night before and three nights after these pictures -- separate reductions, and I'm reporting their mean. The absolute positions may be systematically in error by as much as 0.1", but the relative positions should be good to about 0.03". -- Bill Owen codes MPC: COD 673 CON W. M. Owen Jr., Jet Propulsion Laboratory 301-150, Pasadena CA 91109-8099 CON [wmo@jpl.nasa.gov] OBS G. L. Grasdalen MEA W. M. Owen Jr. TEL 0.61-m f/16 reflector + CCD NET Tycho-2 Format: These are reported in the format used by the Minor Planet Center. This is a sequential file; one record contains 80 bytes with the MPC format, col. 1-12 the satellite number or designation, col. 16-19 the year, col. 21-22 the month, col. 24-31 the day and fraction of day, col. 33-34 hours | col. 36-37 minutes > right ascension col. 39-43 seconds | col. 45-47 degrees | col. 49-50 minuts > declination col. 52-55 seconds | col. 66-69 magnitude if available col. 71 spectral band for the magnitude if available col. 78-80 observatory IAU number ==============================================================================