  The NASA Exoplanet Archive was searched for planets with an equilibrium
temperature below 600 K, mass uncertainty less than 27 percent, and radius
uncertainty less than 8 percent. This search produced 93 planets with mass from
0.3 to 1680 ME; and 101 planets if the Solar System planets are included. The
characteristics of the sample in this catalog are: (1) 94 percent of the
Terrestrial planets have mass less than 2.9 ME and radius less than 1.4 RE, (3)
The sample has a small drop in population consistent with the previously
identified radius gap from 1.5 to 2.0 RE, (4) Planets in the radius range 1.50
to 2.25 RE are consistent with either a gas-rich Terrestrial composition or a
rock-ice Terrestrial composition with a supercritical hydrosphere and water
mass fraction less than 20 percent, (5) A super-Neptune radius desert is
observed for the radius range 4.5 to 7.5 RE, (6) Saturn composition planets
have masses from 15 to 170 ME and radii from 7.9 to 10.1 RE, (7) A nearly
barren sub-Saturn mass-radius desert is found in the sample as indicated by a
lack of planets with mass exceeding 20 ME and radii in the range 4.0 to 7.5 RE,
(8) Most Jupiter composition planets have radii between 10.9 and 12.4 RE and
mass exceeding 200 ME, (9) With few exceptions, planet radius can be used as a
proxy for planet composition classification into Terrestrial, gas-rich
Terrestrial or supercritical hydrosphere Terrestrial, Rock-Ice Giant, and Gas
Giant composition classes for this sample of Teq less than 600 K planets. The
characteristics of this sample are consistent with several predictions of the
core accretion model including the predicted values for the critical core mass
for gas accretion and runaway accretion, the pebble isolation mass, and the
Saturn mass desert.
