BepiColombo vs Messenger
The Mercury Surface, Space Environment, Geochemistry, and Ranging, or MESSENGER, became the first spacecraft to orbit Mercury on 18 March 2011 (UTC). BepiColombo will be the second-ever mission to orbit Mercury.
In terms of size, MESSENGER was smaller than BepiColombo’s MPO (the larger of the two orbiters). MESSENGER's main body was 1.44 metres (4.7 foot) high, 1.28 metres (4.2 foot) long and 1.85 metres (6.1 foot) wide. MPO is 0.26 metres (0.9 foot) taller, 1.12 metres (3.7 foot) longer and 0.35 metres (0.8 foot) wider.
The BepiColombo orbiters have over twotimes as many instruments as MESSENGER. This means the observational firepower at ESA and JAXA’s disposal is something never to have graced Mercury before.