Sega planet codenames

After successfully launching the Sega Mega Drive, Sega commissioned several projects under different codenames of the planets in the Solar System. These are listed below.

Codename	Equivalent
Sega Mercury	Sega Game Gear
Sega Venus	Sega Nomad
Sega Earth	Unused
Sega Mars	Sega 32X
Sega Jupiter	Cart-based 32-bit system; abandoned in planning stages in favor of a disc-based system that became known as...
Sega Saturn	Final name.
Sega Uranus	Unknown, possibly unused
Sega Neptune	32X/Mega Drive combo unit
Sega Pluto	Unknown, possibly unused

Furthermore, hardware released around the time the Saturn was had codenames based on Saturn's moons:

Codename	Equivalent
Titan	Sega Titan Video
Janus	Sega Picture Magic

It is unknown whether the Sega CD, Sega Mega Jet, Sega Pico, arcade hardware, or any other Mega Drive/Saturn-related hardware had codenames.

By the time the Sega Dreamcast was planned, Sega had moved on to a new scheme.

Sega Game Systems (by console generation)
2nd Gen	SG-1000 | SG-1000 II | SC-3000
3rd Gen	Mark III | Master System | Game Gear
4th Gen	Mega Drive/32X/CD | Pico
5th Gen	Saturn
6th Gen	Dreamcast