Time: 22:34UT 2021-07-25 Exp.23 x 15sec
Telescope 0.254m f/6.34 ST-10XME CCD 0.76"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.

Plutonium Isotope.Atom-weight 238.Half-life 87.7 years gives power to the Voyagers, New Horizon and other distant spacecrafts.

AT2021twr (= PGIR21gds) discovered 2021/07/16.260 at R.A. = 20h21m07s.665, Decl. = +29°14'08".67 Mag 11.4:7/16, Type Nova? (References: TNS)

Reference David Bishop http://www.rochesterastronomy.org/snimages/

Discovery page (References: TNS):
https://www.wis-tns.org/object/2021twr

Reference image from Aladin or Sloan Digital Sky Survey