FITS functions

Functions for reading .FITS files.

spookyspec.fits.fits_to_np(spec)

Convert from fits to numpy

Convert a file from fits format to two numpy arrays.

Parameters

spec (str) – path to .fits file containing data

Returns

wavelength points flux (np.array): flux points

Return type

lambda (np.array)

spookyspec.fits.get_image_data(filename, order)

Get an order from a multispec fits file

Get the information from a single order in a fits file containing multiple orders of data (e.g. from an echelle spectrograph)

Parameters

  • filename (str) – Path to the .fits file containing the data

  • order (int) – echelle order to pull data from

Returns

l (np.array): wavelength points f (np.array): flux points

spookyspec.fits.read_psg(filename, col)

Read PSG-style output

Read a spectrum output from the Planetary Spectrum Generator (psg.gsfc.nasa.gov)

Parameters

  • filename (str) – path to the file containing the data

  • col (str) – column the rad file to read

spookyspec.fits.read_two_column(filename)

Read a two column spectrum

Read a two column file. pandas with the python regex parsing engine is used so that the read in is ‘smart’ i.e. you don’t have to worry about whitespace so long as the file is whitespace delimited. This function also stores the fits header. That portion of the code was written by Beth Klein.

Args

filename (str): path to file containing data

Returns

args (2-tuple of type np.array): arguments of the Spec class kwargs (dict): keyword arguments of the Spec class

Example

Use the lambda flux format as follows:

Header
...
END
920.00003    6.58511E+09
920.00472    6.58510E+09
920.00942    6.58509E+09
920.01411    6.58507E+09
...