Welcome to the Montreal Open Clusters and Associations (MOCA) database.
This website contains a collection of datasets on stellar associations and open clusters and their members. This page allows to consult a detailed report about a star or an association, and the About page contains much more information about MOCAdb.
Consult the report about a STAR:
Consult the report about an ASSOCIATION:
This page will automatically interpret the input name to identify the correct MOCA object, and gather all of the latest available data throughout the MOCA tables to display them in a convenient format. Note that the % character can be used as a wildcard.
The full names of associations such as "Columba" can be used to obtain a MOCA report. Shortened association names such as "BPMG" can also be used if it is recognized as a valid moca_aid key in the table moca_associations. Those are also the same shortened names as those used in the BANYAN Σ tool. The wildcard can also be used to search for a full association name, such as "Tucana%"
The same rules apply for the names of stars; any simbad-resolvable name or a valid designation in the table mechanics_all_designations can be used. For example: "AU Mic", "PSO J318%-22%" or "SIMP%0136%" will return a single valid match and therefore display a report correctly.
A search by coordinates can be performed by entering coord(ra,dec,radius) instead of a star name in the search field. The right ascension (ra) and declination (dec) should be specified in decimal degrees or in sexagesimal hours (ra) and degrees (dec), and the search radius should be specified in arcseconds, or omitted altogether with coord(ra,dec) to assume a search radius of 5 arcseconds. For example, a search around the coordinates of the star AU Mic could be specified as coord(311.2912,-31.3425,5), or coord(20:45:09.884,-31:20:33.00,5).
A search by unique MOCAdb object identifier (usually corresponds to the moca_oid column in MOCAdb tables) can be performed by entering oid(id) instead of a star name in the search field. For example, a search for AU Mic's unique identifier 10946 can be with the following query: oid(10946).
Matching a list of custom star names with the MOCA database requires the use of the mocapy Python package, and examples are given in the README documentation of the mocapy GitHub page.
A list of all associations in the MOCAdb can be found here.