This article summarizes additional considerations for planning new observations with the Roman Wide Field Instrument (WFI). These topics highlight special or non-standard observing scenarios that may require particular attention during proposal development. In the future, some of these items may be expanded into dedicated articles with more detailed guidance.

Considerations for Time Series Observations

Time series observations are implemented in the Astronomer's Proposal Tool (APT) using Linking Requirements. Two types of temporal links are available:

• The After Special Requirement, which links observations by specifying the execution order of passes and a minimum time interval between them.
• The Time Series Special Requirement, which links observations by specifying a fixed PERIOD and a TOLERANCE to constrain the temporal links.

Using the Time Series Special Requirement

For the Time Series Special Requirement, the Astronomer's Proposal Tool (APT) enforces an allowed range for the PERIOD of 4.0 days to 365.0 days . As a result, time series observations implemented using this mechanism are limited to cadences within this range. Observations requiring time series cadences shorter than 4 days may be permitted when supported by a strong scientific justification. Proposals requesting such cadences must include this justification in the proposal text, and proposers are encouraged to contact the Roman Help Desk for guidance on the technical implementation of these observations in APT and coordination with the Roman Science Operations Center (SOC).

Considerations for Calibration Observations

The project-level Calibration Working Group has developed an extensive On-Orbit Calibration Plan that ensures the collection of sufficient calibration data to meet the Roman Mission's calibration requirements. However, there may be some science cases that require additional calibration observations. 

For additional questions not answered in this article, please contact the Roman Help Desk.