apass_dr9#
- stellarphot.core.apass_dr9(field_center, radius=<Quantity 1. deg>, clip_by_frame=False, padding=100, magnitude_limit=None, magnitude_limit_passband=None)[source]#
Return the items from APASS DR9 that are within the search radius and (optionally) within the field of view of a frame.
- Parameters:
- field_center
astropy.coordinates.SkyCoord,astropy.wcs.WCS, or FITS header Either a
SkyCoordobject, aWCSobject or a FITS header with WCS information. The input coordinate should be the center of the frame; if a header or WCS is the input then the center of the frame will be determined from the WCS.- radius
astropy.units.Quantity, optional Radius around which to search.
- clip_by_framebool, optional
If
True, only return items that are within the field of view of the frame.- paddingint, optional
Coordinates need to be at least this many pixels in from the edge of the frame to be considered in the field of view. Default value is 100.
- magnitude_limitfloat, optional
If provided, only return items with magnitudes less than or equal to this value.
- magnitude_limit_passbandstr, optional, default is “V”
If provided, the passband to use for the magnitude limit. The name of the passband must be one of the AAVSO standard passband names.
- field_center
- Returns:
stellarphot.CatalogDataTable of catalog information.
Notes
APASS DR9 does not include an identifier column. Thought Vizier does provide a
recnocolumn, it is does not stay the same over time. This function generates an ID based on the coordinates of the APASS star, following the guidelines in IAU designation specification.