APT Graphical Timeline
As of APT 27.1 and following, APT contains a graphical timeline tool to provide insight to users on the detailed components comprising requested observations.
When developing a proposal, APT uses a timing model and standard assumptions about overheads to report both the science time and the total time (including overheads) that will be needed to execute a given visit and observation. Running Smart Accounting at the end of your proposal development looks at the proposal in its entirety and adjusts the charged overheads to provide a total accounting of the resources needed for the program. However, just reporting a total roll-up of overhead time often leaves users wondering about the details, which are difficult to discern with the reports and information previously available.
Beginning with APT version 27.1 released in winter 2019, the JWST branch of APT now includes a graphical Timeline tool that provides the user with a breakdown of the various overheads affecting their proposed observations. Labeled color bars show the different components of the overheads in the context of each selected visit or observation. Controls for zooming the display in the time dimension or providing additional details and labeling are available, as shown in the Figures below. Also, hovering the cursor over a color bar results in a pop-up window with additional information.
The graphical timeline is not meant to represent the actual detailed set of events that occur in the onboard execution of the observation. Rather, it is a tool to provide the user with insight into the major steps that occur and the times accounted to each within the APT timing model.