Euclid on Sky
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Fig. 23

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VIS and NISP image of a very bright star. HD 1973, a fifth magnitude star in the HE-band (IE = 6.3, YE = 5.5, JE = 5.3, HE = 4.9), featured on a deep (3 ROS) ERO stack in the IE-band (left) and the HE- band (right) within a 23ʹ × 23ʹ field. The extended halo of VIS (left) concludes smoothly, exhibiting no detectable signal beyond a 5ʹ radius. Conversely, the NISP extended halo (right) terminates more abruptly – a characteristic of its refractive optics – yet also without a detectable signal past a 5ʹ radius. The diffraction spikes for VIS extend outward to approximately 12ʹ, whereas for NISP in HE-band they reach out to about 20ʹ. The very faint gradient observed in the background of the VIS image is attributed to stray light entering through the instrument platform rather than originating from the optical beam.

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