Przybylski's Star possibly also contains many different short-lived actinide elements, with actinium, protactinium, neptunium, plutonium, americium, curium, berkelium, californium, and einsteinium being theoretically detected. The longest-lived known isotope of einsteinium has a half-life of only 472 days, though according to astrophysicist Stephane Goriely, the evidence for such actinides is not strong, as "Przybylski's stellar atmosphere is highly magnetic, stratified and chemically peculiar, so that the interpretation of its spectrum remains extremely complex [and] the presence of such nuclei remains to be confirmed." Furthermore, Vera F. Gopka, lead author of the actinide studies, admits that "the position of lines of the radioactive elements under search were simply visualized in synthetic spectrum as vertical markers because there are no atomic data for these lines except for their wavelengths... enabling one to calculate their profiles with more or less real intensities." The signature spectra of einsteinium isotopes have since been comprehensively analyzed experimentally (in 2021), though there is currently no published research confirming whether the theorized einsteinium signatures proposed to be found in the star's spectrum match the lab-determined results.