Imaging with two filters, a B filter having a passband of 370-510 nm and a
Sloan i passing 700-850 nm allows a comparison of the dust and gas in the
inner coma.

The two images from observations made last night, which have been subjected
to the same Larson-Sekanina processing, are remarkably different in several
aspects.

The dust image shows a short spiralling jet beginning somewhere around p.a.
0° and spiralling anticlockwise through an angle of about 210°.
The same feature in the gas coma appears to move outwards about 2x faster
than the dust one and spirals anticlockwise more than 400°.

Notice also the two prominent tails that emanate from either side of the
pseudonucleus, whereas the dust is a much more mixed feature.

The dust envelopes are at different distances from the nucleus than the gas
ones. Also the dust envelopes are sort of parabolic in shape whereas the gas
are generally circular centred on the nucleus. This circular symmetry
extends much further outwards than shown here when seen in the ordinary
light image

At a solar elongation of 35°, phase angle of 103° and a distance from Earth
of 0.69au, we are having a favourable apparition of Comet NEOWISE. That we
see distinct spirals in the inner coma means that we must be seeing the
nucleus relatively close to 'pole-on' and that there is one active region on
the nucleus that is producing a large fraction of the outflowing material in
a continuous fashion lasting perhaps many days.

Richard