As of April 13, 2015 the archive is now using the STScI Single Sign-On (SSO) identity manager.
To check on your account click
For more information about how accounts were transitioned click here.
Search by Locally held catalogs
The forms listed below offer a variety of cross-mission
search options using either positions extracted from online catalogs,
allowing a user to search by class
or user-specified target names or positions. Submitting any of the
forms will return a table of entries listing the data available from
the MAST archive for the target or targets of interest.