Japanese space agency JAXA plans to launch two different rockets of different payloads and mission objectives on the same month, August 2013.
The Japan Aerospace Exploration Agency (JAXA) announced last May 21, 2013 that they are planning to schedule two rocket launches this August 2013. Though scheduled on the same month, each launch will be designated on a different day, will be launched on two different sites, and will have entirely different payload and objectives.
The first launch will be scheduled on August 04, 2013. It will be the launch of a standard H-IIB rocket. The payload in this mission is the unmanned HTV4, and it will be performing its regular duty of resupplying the International Space Station (ISS) and its Kibo Experiment Module.
The second launch is scheduled on August 22, 2013.The very first completed version of JAXA's Epsilon rocket would blast off, carrying the Sprint-A Space Telescope into orbit. The objective of the Sprint-A (Small scientific satellite Platform for Rapid Investigation and Test – A) Space Telescope is to provide an additional space observatory that would continuously study and examine plasma/atmospheric discharges and magnetic field changes of Mercury, Venus, Mars, Jupiter, and Saturn.
The H-IIB rocket launch will be held at the Yoshinobu Launch Complex of the Tanegashima Space Center, while the Epsilon rocket launch will be held at the Uchinoura Space Center.