Mariner 10 and Messenger.
NASA's MESSENGER spacecraft and the European Space Agency's BepiColombo mission are the main spacecraft that have explored Mercury. MESSENGER orbited Mercury from 2011 to 2015, providing detailed data and images of the planet. BepiColombo, a joint mission between ESA and JAXA, was launched in 2018 and is in the process of studying Mercury's surface and magnetic field.
There have been two space probes: Mariner 10 and Messenger.
The primary spacecraft that have explored Mercury are NASA's Mariner 10 and MESSENGER. Mariner 10 flew by the planet three times in the 1970s, while MESSENGER orbited Mercury from 2011 to 2015, providing extensive data about its surface and environment. There are currently no robots on the surface of Mercury, and no satellites are currently in orbit since MESSENGER's mission concluded.
Satellites don't visit anything, they orbit astronomical masses.
Mercury was explored by no one only observed.
MESSENGER never landed on mercury
As of now, Mercury has been explored by two spacecraft: NASA's Mariner 10, which conducted three flybys between 1974 and 1975, and the MESSENGER mission, which orbited the planet from 2011 until 2015. Mariner 10 provided the first close-up images of Mercury's surface, while MESSENGER offered extensive data on its geology, atmosphere, and magnetic field. There are currently no operational satellites or robots actively exploring Mercury.
Mercury has only been explored by space probes, specifically Mariner 10 in 1973, and MESSENGER in 2004. Unrelated to the planet are the Mercury spy satellite program of the 1990s, and the 1959-1963 human spaceflight program Project Mercury.
From what I have learned, there has not yet been a robot that explored Mercury from closeup. They see Mercury since it is able to be seen by the naked eye in certain times of the night and day. It can also be seen with a telescope. So in all: There has not yet been a robot to explore Mercury from what I know. I apologize if this is incorrect.
mercury
The name of the Latin messenger god is Mercury.