tesswcs

This package will enable you to create an astropy World Coordinate System for any pointing of the TESS telescope. You can access both the true WCS from archival data, and predict the WCS for a given RA, Dec, and spacecraft roll.

Installation

You can install tesswcs using pip

pip install --upgrade tesswcs

Usage

Below is an example of how to obtain a WCS for archival data

import tesswcs

wcs = tesswcs.WCS.from_archive(sector=1, camera=1, ccd=1)

Using astropy's WCS interface you can now either work with this object, for example you can obtain the sky position of row and column positions

wcs.pixel_to_world(row, column)

or obtain row and column positions from sky positions (using the astropy.coordinates.SkyCoord object).

from astropy.coordinates import SkyCoord
wcs.world_to_pixel(SkyCoord.from_name("HD 209458"))

You can also save these objects to fits files

wcs.to_fits('wcs.fits')

If you have a RA, Dec and roll in degrees you can also predict a WCS

import tesswcs

wcs = tesswcs.WCS.predict(ra=0, dec=0, roll=0, camera=1, ccd=1)

You can use tesswcs to better understand what sources will be obervable on TESS pixels, or to make figures like the ones below!