Also onboard will be Total Ozone Mapping Spectrometer spacecraft, known as QuikTOMS, which Orbital developed for NASA's Goddard Space Flight Center and for which the company built the ozone mapping instrument.
About two and a half minutes later, Taurus will also deploy the QuikTOMS satellite into a Sun synchronous orbit at 470 kilometers above the Earth.
The QuikTOMS satellite, which Orbital built for NASA's Goddard Space Flight Center, is based on the company's flight-proven MicroStar spacecraft, on which nearly 40 in-orbit satellites have been based over the last six years.
Orbital also announced that the mission's secondary satellite, the QuikTOMS science spacecraft, which the company built for NASA, has already arrived at VAFB after being shipped late last week.
A team of Orbital, ORBIMAGE and NASA engineers will then perform a series of pre-launch tests to ensure that all the systems of OrbView-4, QuikTOMS and Taurus are functioning together as planned.