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On Tuesday Sep. 9 between 8 and 9 PM (Eastern) there may be one or more interruptions to STScI's internet connection.

As of April 13, the archive is now using the STScI Single Sign-On (SSO) identity manager. To check on your account click here. For more information about how accounts were transitioned click here.

MAST Web Tutorial


The MAST Web Tutorial has become out-of-date and is temporarily offline until updates can be completed. Questions about the MAST web site can be sent to the help desk via e-mail at archive@stsci.edu or call 410-338-4443.

We apologize for the inconvenience.