Apollonia quadrangle
Encyclopedia
The Apollonia quadrangle (H-5) runs from 360 to 270° longitude and 20 to 70° latitude on Mercury
. It was not illuminated when Mariner 10
made its three flybys of the planet and so wasn't mapped in detail until MESSENGER
few by the planet in 2008. It is named after the Apollonia albedo feature.
Mercury (planet)
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87.969 Earth days. The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about its axis for every two orbits...
. It was not illuminated when Mariner 10
Mariner 10
Mariner 10 was an American robotic space probe launched by NASA on November 3, 1973, to fly by the planets Mercury and Venus. It was launched approximately two years after Mariner 9 and was the last spacecraft in the Mariner program...
made its three flybys of the planet and so wasn't mapped in detail until MESSENGER
MESSENGER
The MErcury Surface, Space ENvironment, GEochemistry and Ranging space probe is a robotic NASA spacecraft in orbit around the planet Mercury. The spacecraft was launched aboard a Delta II rocket in August 2004 to study the chemical composition, geology, and magnetic field of Mercury...
few by the planet in 2008. It is named after the Apollonia albedo feature.