Hermes and Caduceus

This object does not exist.

This object has been proven to not exist by further study. Please take it lightly and with a grain of salt.

Hermes
31 Crateris, the star it was mistaken for.
Discovery
Discovered By	No one
Discovered On	Early 1970s (claimed)
Discovery Site	Mariner 10
Orbital Characteristics
Planet of Origin	Mercury

Caduceus (joke object)
Discovery
Discovered By	NASA (as an April Fools joke)
Discovered On	April 1, 2012 (joke)
Physical Characteristics
Diameter	70 meters
Radius	35 meters
Temperature	Presumably the same as Mercury
Orbital Characteristics
Planet of Origin	Mercury
Semi-Major Axis	14,300 km
Orbital Motion	Prograde (?)

There are no moons of Mercury, although some hypothetical moons have been disproven.

Hermes

Hermes (nicknamed Hermes, no official name) would be an undiscovered natural satellite orbiting the planet Mercury. One was briefly thought to exist in the early 1970s, but it turned out to be misinterpreted data from a star, 31 Crateris. Observation of a moon of Mercury from Earth would be difficult because Mercury is relatively close to the Sun. For example, Mercury was not observed in the infrared spectrum until 1995. NASA's MESSENGER spacecraft, which orbited Mercury from 2011 to 2015, did not detect any moon.

Caduceus

On April 1, 2012 (April Fool's Day), NASA posted a joke post, saying that a new moon around Mercury was discovered, called Caduceus.