ALMA Cycle 8 2021 Call for Proposals

Published: 17 Mar 2021
Credit: Pablo Carrillo

The ALMA Director, on behalf of the Joint ALMA Observatory (JAO) and the partner organizations in East Asia, Europe, and North America, is pleased to announce the ALMA Cycle 8 2021 Call for Proposals (CfP) for scientific observations to be scheduled from October 2021 to September 2022. More detail can be found on the ALMA Science Portal.

For this Main CfP, the JAO anticipates having 4300 hours of approved science time on the 12-m Array and at least 3000 hours each on the 7-m Array and the Total Power Array.  Together, the 7-m Array and Total Power Array form the Atacama Compact Array (ACA), also known as the Morita Array.  Additional time on the ACA in Cycle 8 2021 will be made available later in a Supplemental CfP.

ALMA Cycle 8 2021 proposal submission will open at

15:00 UT on Wednesday, 17 March 2021

 The Cycle 8 2021 proposal submission deadline is

15:00 UT on Wednesday, 21 April 2021


 The key dates for the Main CfP in Cycle 8 2021 are given in the following Table. 



17 March 2021 (15:00 UT)

Release of Cycle 8 2021 CfP, Observing Tool, and supporting documents, and opening of the Archive for proposal submission

21 April 2021 (15:00 UT)

Proposal submission deadline for Cycle 8 2021 proposals

August 2021

Announcement of the outcome of the proposal review process process

October 2021

Start of ALMA Cycle 8 2021 science observations

September 2022

End of ALMA Cycle 8 2021


The ALMA Proposer’s Guide contains all pertinent information regarding this ALMA Main CfP as well as the Supplemental CfP. A comprehensive description of the ALMA observatory and its components can be found in the ALMA Technical Handbook. For information not provided at the Science Portal, proposers may submit a Helpdesk ticket. Registration at the ALMA Science Portal is required to submit a Helpdesk ticket.

Every effort will be made to undertake observations at ALMA Cycle 8 2021 as described in this Call. However, given the on-going pandemic and its uncertain evolution through 2021 and into 2022, there may be unforeseen impacts on observatory operations in Cycle 8 2021. ALMA will keep the community informed of any significant developments.