The experiment is to take pictures in the IR spectrum of astronomical targets outside the solar system for scientific analysis. The IR camera will be stabilized by a gimbal.
There are distortions in the surface and lower atmosphere like IR-reflection and scattering of light. Also in the vicinity of the surface there is a significant amount of light pollution. Therefore a more satisfactory signal to noise ratio can be achieved at higher altitudes due to the relative lack of IR interference. The BEXUS balloon will reach an interesting height where the only light pollution is the solar irradiance and this can be blocked with an additional heat shield/ baffle. Additionally at this altitude, the above mentioned atmospheric effects can largely be avoided.
The telescope will be mounted on the side of the gondola,slightly outside of it. Due to the limited field of view of the system, the selected target will change multiple times during the flight. As the gondola rotates, this motion will be compensated while making the images. If the target gets out of the field of view due to this motion, the target is changed.
Before the flight necessary calibration will be undertaken and the system will go into sleep mode to save power. The system will stay in this mode until at least a height of 20 km is reached.
The telescope will be pointing steadily into the direction of the astronomical target that is being studied. The images will be made by using different integration times. The data is logged on the system and sent to the ground station through the BEXUS E-link.
Because of the rotation of the gondola, the telescope might sometimes lose line of sight of the most recently studied astronomical target. In this case other astronomical targets within the new field of view of the camera will be photographed.
The gimbal will be positioned to have the highest probability to keep the telescope and camera intact on impact with the ground. Then the entire system will be shutdown.