List of Observed Interstellar Molecules

Since 1996

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Update

2023/10/06
NEW The latest version is on 10 October 2023. Overlap count for the trans-isomer monothioformic acid (t-HC(O)SH) was corrected, as this has been found in 2021. Hence, the current number of molecules is 295.

2023/09/25
The latest version is on 25 September 2023. The trans-isomer monothioformic acid (t-HC(O)SH) was newly detected. Hence, the 296 molecules have been detected so far.

2023/09/06
The latest version is on 06 September 2023. Carbonic Acid (HOCOOH) was newly detected. Hence, the 295 molecules have been detected so far.

2023/08/29
The latest version is on 29 August 2023. NH2C(O)CH2OH, H2CCCH+, and H2CCCN were newly detected. Hence, the 294 molecules have been detected so far.

2023/06/25
The latest version is on 25 June 2023. HSO was newly detected. Hence, the 291 molecules have been detected so far.
Thanks to the adivice of a user of this website, the detected year for C2H5SH, the reference of HC4NC, and the Journal page of HCCNCH+ were added or corrected.

2023/05/25
The latest version is on 25 May 2023. C4H5CN was newly detected. Double counting for H2NCO+ was corrected.
The 290 molecules have been detected so far.

2023/05/04
The latest version is on 04 May 2023. HMgCCCN, NaCCCN, MgC4H+, MgC3N+, MgC6H+, and MgC5N+ were newly detected.

Read me

This site is edited by Mitsunori Araki, Max-Planck-Institut fuer extraterrestrische Physik. E-mail:

■ Sortable for numbers of atoms, species of atoms included, functional groups and detected years
■ References of the first detections are linked.
■ Clouds, telescopes, and column densities for the first detections are listed.
■ For details, see a readme sheet in the Excel file.
■ CAUTION: This list includes tentatively detected molecules. Check the status column.