The METEORIX CubeSat is planned to observe meteors and space debris. Objectives of this project include determination of the origin of the meteoroids, and characterisation of flux density, which can constrain the environmental models for space and ground activities. To effectively achieve the objectives, this work investigates the 3D measurement of entering objects with two METEORIX CubeSats. The mission operation is assumed in the simplest way; that is, the CubeSats are deployed from the launcher at the same time but in different directions, there is no orbit control afterwards, and the CubeSats will constantly point their cameras in the nadir direction. Through analyses of measurement error, view intersection, and the orbital drift of the cluster flight, we have shown the achievable measurement performance under the simplest operation.