Spectrophotometric device with a plurality of spectral measurement bands, comprising: - a telescope having an entrance pupil and an output focal plane, adapted to focus, in the output focal plane, radiation that enters the telescope through the entrance pupil; - a spectrophotometer having an entrance which is superimposed on the output focal plane of the telescope, and comprising a spectral spreading component and an array detector which is optically conjugate with the entrance of the spectrophotometer, said detector having a photosensitive surface which extends in a first detection direction parallel to a direction of spectral spreading produced by the spectral spreading component, and which also extends in a second detection direction perpendicular to the first detection direction, the device being characterized in that it further comprises: - a pupil mask arranged in the entrance pupil of the telescope and having a plurality of apertures forming separate sub-pupils which are respectively dedicated to the spectral measurement bands; - pupillary separating prisms, which are arranged one-on-one against the apertures of the pupil mask so that each pupillary separating prism deflects a portion of the radiation which passes through the corresponding sub-pupil in a prismatic deflection direction which is common to all the pupillary separating prisms, and with a prismatic deflection amplitude which is different from that of every other pupillary separating prism, and the spectrophotometer being oriented relative to the pupillary separating prisms so that the second detection direction optically corresponds to the prismatic deflection direction through the telescope and the spectrophotometer; - a plurality of slits, possibly curved, which are distributed in the entrance of the spectrophotometer so that the longitudinal direction of the slits optically corresponds to the prismatic deflection direction through the telescope, and the slits being offset from one another so that each receives through one of the apertures of the pupil mask and one of the pupillary separating prisms, and through the telescope, a respective portion of the radiation which originates from a pointing direction of the telescope; and - a first set of filters, each determining one of the spectral measurement bands, the filters of the first set being arranged in front of the photosensitive surface of the detector, each filter of said first set being effective within a detection aperture which is superimposed along the second detection direction on an image of only one of the slits, formed by the spectrophotometer with a portion of the radiation entering the telescope through a single one of the apertures of the pupil mask, and the detection aperture of each filter extending in the first detection direction. - a telescope having an entrance pupil and an output focal plane, adapted to focus, in the output focal plane, radiation that enters the telescope through the entrance pupil; - a spectrophotometer having an entrance which is superimposed on the output focal plane of the telescope, and comprising a spectral spreading component and an array detector which is optically conjugate with the entrance of the spectrophotometer, said detector having a photosensitive surface which extends in a first detection direction parallel to a direction of spectral spreading produced by the spectral spreading component, and which also extends in a second detection direction perpendicular to the first detection direction, - a pupil mask arranged in the entrance pupil of the telescope and having a plurality of apertures forming separate sub-pupils which are respectively dedicated to the spectral measurement bands; - pupillary separating prisms, which are arranged one-on-one against the apertures of the pupil mask so that each pupillary separating prism deflects a portion of the radiation which passes through the corresponding sub-pupil in a prismatic deflection direction which is common to all the pupillary separating prisms, and with a prismatic deflection amplitude which is different from that of every other pupillary separating prism, and the spectrophotometer being oriented relative to the pupillary separating prisms so that the second detection direction optically corresponds to the prismatic deflection direction through the telescope and the spectrophotometer; - a plurality of slits, possibly curved, which are distributed in the entrance of the spectrophotometer so that the longitudinal direction of the slits optically corresponds to the prismatic deflection direction through the telescope, and the slits being offset from one another so that each receives through one of the apertures of the pupil mask and one of the pupillary separating prisms, and through the telescope, a respective portion of the radiation which originates from a pointing direction of the telescope; and - a first set of filters, each determining one of the spectral measurement bands, the filters of the first set being arranged in front of the photosensitive surface of the detector, each filter of said first set being effective within a detection aperture which is superimposed along the second detection direction on an image of only one of the slits, formed by the spectrophotometer with a portion of the radiation entering the telescope through a single one of the apertures of the pupil mask, and the detection aperture of each filter extending in the first detection direction.