The dusty Coma's angular diameter is approximately 65", and the dust consists primarily of magnesium-rich silicate particles, specifically Fe-Mg silicates and is (As in most comets), mostly driven by the sublimation of Carbon monoxide, Carbon dioxide and water ice within the nucleus.

Calculated expansion speed :
I measured the angular diameter of the comets head to be approximately 65" or 0.00032 radians. ( 2026 04 30 )

With a distance from the earth of 5.657 au = 846 000 000.0 km, we can find the diameter of the dusty head ( coma ) to be 846 000 000 km x 0.00032 = 270,000 km

So here is the average speed of the expansion since outburst ( Approximately 14 days earlier ) :
Radius/14 days = (270,000/2 km) / 14 days = 9,600. km/day = 0.11 km/sec.

Very close to previously measurements similar to Halley's comet.

Sun distance (au): 6.314 Perihel 28.March 2019 Sun dist.: 5,77

Time: 21:06UT 2026-04-30 Exp.133 X 5sec
Tel: 0.254m f/5.8 ST-10XME CCD @ -21°C 0.95"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.

And remember, Physics is Everything.