Recently Added Non-Detections: vinyl formate, HC11N

Recently Added Isotopologues: CH2CHO, HNCO, CH3CHCN

Molecules can exist in a wide range of astrophysical environments, from the extremely cold regions between stars to the atmospheres of stars themselves.

To date, nearly 200 molecular species have been tentatively or definitively identified in interstellar or circumstellar clouds, while about 50 have been identified in studies of comets in our solar system. Numerous isotopologues of interstellar and circumstellar molecules have also been observed.

Some detections reported on these pages may be controversial, but all are taken from the peer-reviewed astronomical literature. A questionable identification may be removed at a later date if circumstances warrant.

Jacque Crovisier has amassed a comprehensive compilation of species observed to date in the interstellar medium, in comets, or in non-terrestrial planetary atmospheres, plus additional ones which may prove to be found.

Interstellar & Circumstellar Molecules
Cometary Molecules
Molecules on Planetoids
  HCN on Pluto 
Planetary Molecules
Molecules in Brown Dwarfs and Stellar Atmospheres

HC11N (no longer a known astromolecule!)
Maintained by DE Woon
Updated 20 February 2017