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Peer reviewed scientific journal

Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer reviewed scientific journal covering research in astronomy and astrophysics. It has been in continuous existence since 1827 and publishes letters and papers reporting original research in relevant fields. Despite the name, the journal is no longer monthly, nor does it carry the notices of the Royal Astronomical Society. MNRAS publishes more articles per year than any other astronomy journal.

MNRAS publishes peer reviewed articles on original research in astronomy and astrophysics. Two sorts of article are carried by MNRAS: papers, which can be of any length, and letters, which are published more quickly but are limited to five pages in length. Editorial control of the journal is exercised by the RAS through an editorial board of professional astronomers; as of July 2012, the editor in chief has been David Flower (University of Durham). In 2022 MNRAS published 3441 articles, more than any other astronomy journal.

The stated policy of the RAS is "to focus on high quality papers through rigorous peer review and, as far as practicable, to provide free publication". Authors are not charged for publishing in MNRAS, with the costs of publications being met by subscriptions. MNRAS provides a form of open access by providing authors with the option to pay for publication, allowing free access by anyone without charge (hybrid open access model). Fellows of the RAS are given free online access to the RAS journals as part of their membership benefits. Downloadable PDF versions of MNRAS articles are made available 36 months after publication (delayed open access model), on both the journal website and the Astrophysics Data System. MNRAS also permits self archiving by authors on personal webpages, in institutional repositories, and on the arXiv server (green open access). Also, authors are provided with a link to a perpetually freely accessible PDF file, the idea being that the file itself should not be hosted by the author nor by anyone except the publisher, while the link to it can be freely distributed. This is the modern equivalent of offprints, paper copies of the article which used to be provided to the author to distribute, freely, as he or she saw fit. Authors do not assign copyright to the RAS or OUP, but are required to grant an exclusive licence to publish the article prior to its publication.