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.
(3708) 1974 FV1
As of 2018, it has not received a name. This makes "" the lowest-numbered unnamed minor planet (there are more than half a million numbered minor planets with more than 20,000 of them being named). This contrasts with the neighboring asteroid, 3707 Schröter and 3709 Polypoites, that were already named in September 1993 and April 1988, respectively (). The asteroid is the next low-numbered, unnamed minor planet.