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The detection of interstellar bodies passing near the Sun offers theopportunity to observe not just objects similar to those in the solar system,but also unfamiliar objects without solar system analogues. Here I show thatAsymptotic Giant Branch (AGB) stellar evolution may lead to the creation, outof stardust, of substantial numbers of nomadic Post-Main-Sequence Objects(PMSOs). ABG nucleosynthesis will produce three broad classes of PMSOchemistry, oxygen, carbon and nitrogen rich (O-rich, C-rich, N-rich,respectively), depending largely on the original stellar mass. I further showthat the Interstellar Comet 2I/Borisov (2I) belongs to a kinematic dynamicalstream, the Wolf 630 stream, with an age and galactic orbit consistent with itsorigination as a stardust comet; the apparent lack of water in the 2I coma isconsistent with it being a C-rich PMSO. I also provide predictions fordistinguishing stardust comets from more conventional interstellar comets andasteroids ejected during planetary formation; these can be applied to 2I in itsupcoming observational phase in early 2020 as it moves away from the Sun. Inparticular, isotope ratios of the CNO elements could be dispositive, IRdetection of the 11.3 {\mu}m SiC line, the 30 {\mu}m line, or the IR PAH lineswould provide strong evidence for a C-rich PMSO and detection of Na or Lienhancement would indicate an N-rich PMSO.

Is Interstellar Object 2I/Borisov a Stardust Comet? Predictions for the Post Perihelion Period