For Pandeia Engine v1.5.1

Requirements

The Pandeia Engine is a Python module, and requires both code and data files to operate.

Code

Data

Required Data

In order to function, the Pandeia Engine requires one* set of reference data (containing instrument definitions):

James Webb Space Telescope: https://stsci.app.box.com/v/pandeia-refdata-v1p5p1

Nancy Grace Roman Space Telescope:

The location of the top of the data file tree (the folder containing PSF_VERSION) must be set as the $pandeia_refdata environment variable.

*Both telescope datasets may be untarred to the same location; any files the two packages have in common may be overwritten.

Optional Data

An additional dataset can be used to provide more spectroscopic functionality (phoenix spectral models, normalization by HST bandpasses, normalizing in among others).

The files will produce a directory tree of grp/hst/cdbs; the Pandeia Engine expects the environment variable $PYSYN_CDBS to point to the cdbs directory.

Installation

We recommend using the Anaconda python distribution.

Once installed, from a terminal with access to the conda environment, type "conda config --add channels http://ssb.stsci.edu/astroconda" to install the Astroconda channel.

Create an AstroConda environment with the STScI package installed. For example, to create an environment named "pandeia" working under python 3.6, type "conda create -n pandeia stsci numpy scipy=1.1 astropy=2 photutils pysynphot setuptools python=3.6" from a terminal with access to the conda environment.

Then, install the engine itself: `pip install pandeia.engine==1.5.1`

It should also be possible to install the Pandeia Engine by simply running `pip install pandeia.engine==1.5.1` but this is not recommended and users are likely to run into more issues we cannot solve if installed this way.