Planet
The smallest known planet is PSR B1257+12A, one of the first extrasolar planets discovered, which was found in 1992 in orbit around a pulsar. Its mass is roughly half that of the planet Mercury. The smallest known planet orbiting a main-sequence star other than the Sun is Kepler-37b, with a mass (and radius) slightly higher than that of the Moon.
(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.