NASA's James Webb Space Telescope

JWST Target Visibility Tools Now Available

News Feature February 23, 2017

User interface of the JWST Coronagraph Visibility Tool
The figure shows the user interface to the CVT, with the control panel on the left, the overview visibility plot in the center, and a specific instrument field of view on the right. The visibility plot shows both the windows in time when JWST can view the target and the allowed range of position angles over which the target can be viewed. By entering companions in the control panel, the tool shows tracks in the right panel showing the companion visibility as a function of time with respect to the selected instrument’s field of view, including any obscurations.

As with HST, the Astronomer's Proposal Tool will provide schedulability information for each target.  However, there are a number of instances where you may want an overview of target visibilities and the range of available position angles on the sky for a target prior to entering APT, to pre-plan the strategy of your observing program.

For this quick-look capability, the JWST project is making available two tools to help in assessing target visibilities prior to entering information in APT.  One is a General Target Visibility Tool (GTVT) that provides information for all JWST instruments, and the other is the Coronagraphic Visibility Tool (CVT) that provides additional information for detailed planning of MIRI and NIRCam coronagraphic observations.  These tools provide broad overview information on target visibilities that is not easily derived from APT, and so they complement APT’s detailed schedulability analysis.

The tools are being distributed as part of STScI’s AstroConda python distribution package.  Specific details for downloading AstroConda and activating each tool within the AstroConda environment are provided in the linked support articles below:

You can also review the information on downloading and installing AstroConda.

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