Caveats and Unimplemented Features

The MAST Mission Search interfaces currently lack certain intended, but as yet unimplemented features. Many of these features would affect all of these interfaces, but some affect only JWST. In most cases these features are offered in the MAST Portal. These issues will be addressed over time, and this page will be updated as the issues are resolved. 

Common Caveats

The following limitations apply to MAST Mission-specific search interfaces:

• There is no data previewer
• There is no tool for visualizing spatial footprints of the data on the sky, analogous to AstroView in the Portal
• Retrieving data in bulk with scripts is limited to Curl; support for Python is not yet available
• There is no support for download through astroquery.mast using the MastMissions module
  
• There is no support for altering the order or the width of columns in the Search Results table

JWST Caveats

The following limitations apply to the MAST JWST Search interface:

• Planned JWST observations are not searchable
• Only the highest-level Guide Star products are available; lower-level product types (_uncal, etc.) are not currently available for download
• No support for purely "Guide Star" searches (those without accompanying science observations)
• Certain non-FITS Level-3 products, notably the _phot.ecsv products, are grouped with L-2 products. They are also not indicated in the Search Results table in the Product Levels column. This is a side-effect of a problem in the back-end database. You may need to include a wider range of products in the download overlay to include them. 
• The search does not find NIRISS Level-2c _ami products, which are related to Aperture Mask Interferometry

For Further Reading...

• MAST Data Holdings