The VNIR radiometer has a telescope with aspherical lenses (refractive optics) and a dichroic prism. The telescope aperture is 43 mm in diameter with an f/Nr.5 and a focal length of 215 mm. The Si-CCD detectors have 4096 elements. There are four detectors, one for each band. A reference light source unit emits a calibration light during the eclipse period of the orbit to check the radiometric performance of the radiometer. The VNIR instrument mass is 32 kg.