GrismObject

class stdatamodels.jwst.transforms.GrismObject(sid=None, order_bounding=None, sky_centroid=None, partial_order=None, waverange=None, sky_bbox_ll=None, sky_bbox_lr=None, sky_bbox_ur=None, sky_bbox_ul=None, xcentroid=None, ycentroid=None, is_extended=None, isophotal_abmag=None)

Bases: GrismObject

Grism Objects identified from a direct image catalog and segment map.

Notes

The object bounding box is computed from the segmentation map, using the min and max wavelength for each of the orders that are available. The order_bounding member is a dictionary of bounding boxes for the object keyed by order

ra and dec are the sky ra and dec of the center of the object as measured from the non-dispersed image.

order_bounding is stored as a lookup dictionary per order and contains the object x,y bounding location on the grism image GrismObject(order_bounding={“+1”:((xmin,xmax),(ymin,ymax)),”+2”:((2,3),(2,3))})

Create a new GrismObject.

Parameters:

sidint

Source identified

order_boundingdict{order: tuple}

Contains the object x,y bounding locations on the image keyed on spectral order

sky_centroidastropy.coordinates.SkyCoord

RA and Dec of the center of the object

partial_orderbool

True if the order is only partially contained on the image

waverangelist

Wavelength range for the order

sky_bbox_llastropy.coordinates.SkyCoord

Lower left corner of the minimum bounding box

sky_bbox_lrastropy.coordinates.SkyCoord

Lower right corder of the minimum bounding box

sky_bbox_urastropy.coordinates.SkyCoord

Upper right corner of the minimum bounding box

sky_bbox_ulastropy.coordinates.SkyCoord

Upper left corner of the minimum bounding box

xcentroid, ycentroidfloat

The x, y center of object in pixels

is_extendedbool

True if marked as extended in the source catalog

isophotal_abmagfloat

The isophotal_abmag from the source catalog

Returns:

GrismObject

A new GrismObject instance.