... Operations of the Hubble Space Telescope (HST) require the creation of stable and efficient observation schedules in an environment where inputs to the plan can change daily. ... A process and software architecture is presented which achieves stable and efficient observation schedules by dividing the task into long term and short term components. ... However, the resulting long range plan would be unstable as unscheduled observations in a week bin would have to be rescheduled. ...

... Operations of the Hubble Space Telescope (HST) require the creation of stable and e#cient observation schedules in an environment where inputs to the plan can change daily. A process and architecture is presented which supports the creation of e#cient and stable plans by dividing scheduling into long term and short term components. ... The short term scheduler builds e#cient week long observation schedules by selecting observations which have plan windows open within the week. ...

IRAF/STECF 2-D spectrum point source / background decomposition package . ... The general problem is one of spectral decomposition - of separating the spectra of the point sources from the background. ... The STECF IRAF layered package "specres" provides two tasks to extract point source spectra from 2-D images (either longslit, multislit or cross-dispersed) and decompose the full background over the image. ... A Point Source Function spectrum image is required as a 2-D spectrum. ...