This page contains information about MOC, the Multi-Order Coverage map format.

Recommendation History

See IVOA Document Versions for the official list of all IVOA documents and versions.

Standard Release Date
MOC 1.0 02 June 2014

In Progress


We are currently working on MOC 1.1, which is a backward-compatible revision to formalize string serialization of MOCs.

Latest Draft

MOC 1.1 (Working Draft)

Please add comments, concerns, and implementation notes to this RFC page: MOC 1.1 Request For Comments

Past Drafts



Consider for future version Reference Major/Minor Notes



MOC is defined by the MOC standard. The most recent version is Version 1.0, dated 2 July 2014.


MOC validators

MOC compatible tools

  • Topcat & STILTs [Starlink] (generation from catalogs / manipulation)
  • Aladin Desktop [CDS] (generation from images&catalogs / display / manipulation)
  • Aladin Lite [CDS] (display)
  • MIZAR [CNES] (display)
  • ESAsky [ESAC] (display)

MOC examples

Topic attachments
I Attachment Action Size Date Who Comment
Unknown file formatjar Moc.jar manage 62.2 K 2017-12-04 - 13:57 PierreFernique Moc 5.0 bytecode
Unknown file formatjar MocSrc.jar manage 46.6 K 2017-10-25 - 09:42 PierreFernique Moc 5.0 source java code + examples
Unknown file formatjar healpix.essentials.jar manage 68.3 K 2016-01-07 - 09:58 PierreFernique Java HEALPix 3.3 minimal package (required for Moc4.5, 4.6, 4.7 API)
Unknown file formatjar jhealpixSmall.jar manage 48.7 K 2013-09-24 - 10:51 PierreFernique Java HEALPix 3.11 (obsoleted -> required for previous Moc 4.4 API)
Topic revision: r24 - 2019-06-25 - MatthieuBaumann
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