ch_ephem.sources

CHIME source objects.

Note: This submodule reads the CHIME radio source catalogues from disk at import time.

Constants

source_dictionary: The standard CHIME radio source catalogue. A dict whose keys are source names and whose values are skyfield.starlib.Star objects.
CasA: skyfield.starlib.Star representing Cassiopeia A.
CygA: skyfield.starlib.Star representing Cygnus A.
TauA: skyfield.starlib.Star representing Taurus A.
VirA: skyfield.starlib.Star representing Virgo A.

Functions

get_source_dictionary()

Functions

get_source_dictionary(*catalogs)

Return a source dictionary.

ch_ephem.sources.get_source_dictionary(*catalogs: str) → dict[source]

Return a source dictionary.

Returns a dictionary containing skyfield.starlib.Star objects for common radio point sources. This is useful for obtaining the skyfield representation of a source from a string containing its name.

Parameters:: catalogs (str) – Catalogue names. These must be the basename of the json file in the ch_ephem/catalogs directory. If multiple catalogues are provided, the first catalogue is favoured for any overlapping sources.
Returns:: src_dict – Keys are source names. Values are skyfield.starlib.Star objects.
Return type:: dict