conesearch

astropy.vo.client.conesearch.conesearch(center, radius, verb=1, **kwargs)

Perform Cone Search and returns the result of the first successful query.

Parameters:

center : SkyCoord, BaseCoordinateFrame, or sequence of length 2

Position of the center of the cone to search. It may be specified as an object from the Astronomical Coordinate Systems (astropy.coordinates) package, or as a length 2 sequence. If a sequence, it is assumed to be (RA, DEC) in the ICRS coordinate frame, given in decimal degrees.

radius : float or Quantity

Radius of the cone to search:

• If float is given, it is assumed to be in decimal degrees.
• If astropy quantity is given, it is internally converted to degrees.

verb : {1, 2, 3}

Verbosity indicating how many columns are to be returned in the resulting table. Support for this parameter by a Cone Search service implementation is optional. If the service supports the parameter:

1. Return the bare minimum number of columns that the provider considers useful in describing the returned objects.
2. Return a medium number of columns between the minimum and maximum (inclusive) that are considered by the provider to most typically useful to the user.
3. Return all of the columns that are available for describing the objects.

If not supported, the service should ignore the parameter and always return the same columns for every request.

catalog_db

May be one of the following, in order from easiest to use to most control:

• None: A database of astropy.vo.Conf.conesearch_dbname catalogs is downloaded from astropy.vo.Conf.vos_baseurl. The first catalog in the database to successfully return a result is used.
• catalog name: A name in the database of astropy.vo.Conf.conesearch_dbname catalogs at astropy.vo.Conf.vos_baseurl is used. For a list of acceptable names, use list_catalogs().
• url: The prefix of a URL to a IVOA Service for astropy.vo.Conf.conesearch_dbname. Must end in either ‘?’ or ‘&’.
• VOSCatalog object: A specific catalog manually downloaded and selected from the database (see General VO Services Access).
• Any of the above 3 options combined in a list, in which case they are tried in order.

pedantic : bool or None

When True, raise an error when the file violates the spec, otherwise issue a warning. Warnings may be controlled using warnings module. When not provided, uses the configuration setting astropy.io.votable.Conf.pedantic, which defaults to False.

verbose : bool

Verbose output.

cache : bool

Use caching for VO Service database. Access to actual VO websites referenced by the database still needs internet connection.

Returns:

obj : astropy.io.votable.tree.Table

First table from first successful VO service request.

Raises:

ConeSearchError

When invalid inputs are passed into Cone Search.

VOSError

If VO service request fails.