A ribonucleoprotein complex that contains small nuclear RNA U6atac, the Lsm2-8 heptameric ring complex, as well as several proteins that are unique to the U6atac snRNP, most of which remain associated with the U6atac snRNA both while the U6atac snRNP is free or assembled into the U4atac/U6atac snRNP or into a series of spliceosomal complexes.