Gas giant
The smallest known extrasolar planet that is likely a "gas planet" is Kepler-138d, which has the same mass as Earth but is 60% larger and therefore has a density that indicates a thick gas envelope.
List of slow rotators (minor planets)
This list contains the slowest-rotating minor planets with periods of at least 1000 hours, or 41 days. See "" for minor planets with an insufficiently accurate period—that is, a LCDB quality code of less than 2.