Home › Forums › Comets › spectroscopic cross section through C/2020 R4 ATLAS › sodium tail ?
3 May 2021 at 8:33 pm #584165
What date was this ? Objective grating setups showed a nice little sodium coma and tail.
My early example on 7th July
and a better one a few days later by Mike Harlow
but the sodium dropped in intensity after that and was lost in low resolution spectra around 22nd July