Dictionary of Nomenclature of Celestial Objects (Last update: 26-Sep-2023)
Result of query: info cati 2CXO J225716.5-362654$
Details on Acronym: 2CXO 2CXO (Second release of the Chandra Source Catalog)
N: about 150000
Object:(X) (SIMBAD class: X = X-ray Source)
Note:The second release of the Chandra Source Catalog (CSC) is currently under development and is expected early 2014, but we would like to pre-register the acronym. Its nature is identical to the CXO acronym which we reserved exclusively for the first release of the CSC, with one exception: while the first release contained only compact (i.e., unresolved) sources, in this release we will include extended sources as well; if there would a be naming conflict between a compact and an extended source, we will append the letter 'X' to the source name to identify the extended source. Consequently, a source whose name ends in 'X' will be guaranteed to be extended; all other sources may be compact or extended. The rationale for not explicitly identifying compact sources is the large variation in PSF size over Chandra's field of view which makes a specific compact designation meaningless.