As of April 13, 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.
Data Use Policy
Although there is no cost involved in retrieving data from MAST,
researchers are requested to include an acknowledgement (as shown below)
in any publications that make use of data obtained from MAST:
"Some/all of the data presented in this paper were obtained from the
Multimission Archive at the Space Telescope Science Institute (MAST). STScI
is operated by the Association of Universities for Research in Astronomy,
Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is
provided by the NASA Office of Space Science via grant NAG5-7584 and by
other grants and contracts."
Users wishing to use documents obtained from the MAST web
site for other than personal use, should first contact the
MAST staff at email@example.com regarding neccessary
permissions and acknowledgements.