IRAS Additional Observations Catalog

During the 10-month lifetime of IRAS, roughly 40% of the observing time was devoted to pointed observations, also commonly called Additional Observations (AOs). The released POs total 7326. Targets were selected from the following categories: active galaxies; bright stars; close galaxies; comets; deep fields; molecular clouds; Galactic structure; or Solar system. May observations were also characterized as 'filler' or sky-survey follow-ups. The pointed observations were made using well-defined command sequences, or macros, the most commonly used being the DPS macro which produced scans at half the survey rate and increased the SNR by factors ranging from 3.5 to 7.7 depending on the number of scans and the area covered. This dataset or service is made available by the Infrared Science Archive (IRSA) at IPAC, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration.