Presence of off-band leaks in STEREO-A/SECCHI COR2

Ascertain whether the STEREO-A/SECCHI COR2 coronagraph exhibits off-band transmission leaks (e.g., blue near 400 nm or red near 1000 nm) analogous to the red and blue leaks documented in STEREO-A/SECCHI HI1, which would confer sensitivity to CN emission and affect cross-instrument photometric interpretation of 3I/ATLAS.

Background

The paper compares photometry of interstellar comet 3I/ATLAS from multiple solar observatories with differing bandpasses. STEREO-A/SECCHI HI1 is known to have red and blue leaks that increase sensitivity to CN and potentially other species outside its nominal bandpass, while COR2 has a narrower primary bandpass focused in the red.

Whether COR2 has similar off-band leaks directly impacts the interpretation of its measured fluxes and their comparability to the other instruments, particularly when attributing brightness to specific gas emissions versus dust scattering.