The reflectance spectrum of the JWST (spoiler alert it is "pink")

[robin_astro]

For fun I thought I would try to take a spectrum of the JWST with my  modified ALPY200 faint object spectrograph. (Keeping a mag 14-16 target on the 3 arcsec wide spectrograph slit for 90 mins presents some interesting challenges, also applicable to comet spectroscopy)  After correcting for the solar spectrum it turns out that the reflectance spectrum is reddish with a tinge of blue and the green wavelengths significantly attenuated which matches NASA's description of the coatings used on the sun shield.  The spectrum and more information are on my BAA webpage here

https://britastro.org/observations/observation.php?id=20220327_125654_228ed4b0a22ce097

Cheers

Robin