Heweliusz is an optical astronomy spacecraft built by the Space Research Centre of the Polish Academy of Sciences and operated by Centrum Astronomiczne im.

Along with Lem, TUGSAT-1, UniBRITE-1 and BRITE-Toronto, it is one from a constellation of six nanosatellites of the BRIght-star Target Explorer project, operated by a consortium of universities from Canada, Austria and Poland.

[3] Heweliusz was developed and manufactured by the Space Research Centre of the Polish Academy of Sciences between 2010 and 2012, based around the Generic Nanosatellite Bus, and had a mass at launch of 7 kilograms (15 lb).

[7] Heweliusz photometrically measures low-level oscillations and temperature variations in stars brighter than visual magnitude (4.0), with unprecedented precision and temporal coverage not achievable through terrestrial based methods.

The DRAGON nanosatellite deployer was designed specifically for this mission by the Space Research Centre, in collaboration with the SRC spinoff company Astronika.