Putting it together: This looks like a citation or coordinate label from a 1987 ApJ paper — possibly referring to (Supernova 1987A), whose coordinates are near RA 5h35m , not 11h42m. So not that.
The keyword appears to be a specific legal or technical citation that bridges multiple regulatory and academic domains. Depending on the context, it most frequently refers to Malaysian traffic law or Swedish administrative regulations. The Malaysian Context: Road Transport Act 1987 1 sek 1142 apj 1987
: Justice A.P. Sen (notated as "A.P.J." in some citations) ruled in favor of the Samity. The Court held that when a statute confers a power on an authority, it also by implication confers all powers reasonably necessary for its exercise. Key Takeaways for Legal Review Putting it together: This looks like a citation