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Spectral lines belonging to the short-lifetime heavy radioactive elements upto Es ($Z$=99) have been found in the spectra of the Przybylski's star. Wesuggest that these unstable elements may be decay products of a "magic"metastable nucleus belonging to the the island of stability where the nucleihave a magic number of neutrons $N=184$. The laboratory-produced nuclei have asignificantly smaller number of neutrons. To identify spectra of the $N=184$isotopes of these nuclei and their neutron-reach superheavy decay products inastrophysical data we calculate the isotope shift which should be added to thelaboratory - measured wavelenghs. The results for the isotopic shifts in thestrongest optical electromagnetic transitions in No, Lr, Nh, Fl,and $Z$=120elements are presented.

Isotope shift and search for metastable superheavy elements in astrophysical data