NASA Data Center Annual Program Plan
Data Center/Service: Multi-mission Archive at Space Telescope
Supporting Organization: Space Telescope Science Institute
Overall Mission: MAST supports both active and archival mission data sets, focusing primarily on data in the ultraviolet, optical, and near-IR parts of the spectrum. Support includes curation of the data, providing expert support to users of the data, providing access to data-specific calibration and analysis software, providing user support for this software, and maintaining public access interfaces to the data (WWW). MAST works with new mission teams in the supported wavelength regions to assist in the development of Project Data Management Plans, especially in the areas of data formats, descriptive metadata and standardization of keywords, and in the development of data access and data delivery plans.
MAST Data Holdings
Services Provided: MAST provides support for users seeking to understand the properties and instrumental signatures of all archived data sets and assistance with the interfaces to browse and retrieve these data. Access to non-HST mission and instrument specific calibration and analysis software, and assistance in its use, is on a best-effort basis (full support for HST related software is provided by the MAST Helpdesk and staff).
Non-HST Software Provided: IUE RDAF package (IDL-based), IUE Final Archive processing software (IRAF port), EUVE analysis software package (IRAF-based), Copernicus data analysis software (IDL-based), UIT data reduction and analysis software (FORTRAN, C, and IDL routines), WUPPE data analysis software (FORTRAN routines requiring the FITSIO library), and HUT data reduction software (IRAF-based). IDL software for analyzing IMAPS images will also be made available in the near future.
Mission Interfaces: Ingest of FUSE mission data will begin this summer (assuming the June launch proceeds on schedule). Contacts have been established with the GALEX MIDEX mission team and CHIPS UNEX mission team. MAST staff have developed working relationships with staff from all three of the instrument teams from the ORFEUS Project and with members of the Voyager UVS team. Delivery of the initial set of ORFEUS data is expected within the next few months. Public access to UVS data is also expected within the next few months.
Interoperability Activities: MAST and STScI staff have worked on development and testing of the Astrobrowse prototype "Starcast". The MAST web site has search pages and direct links to data retrievals at other astrophysics data centers (EUVE, ROSAT, and ASCA at HEASARC) and providis an interface that enables other sites to send queries to the MAST database. MAST utilizes an AEQ interface at GSFC Astronomical Data Center to provide transparent access to astronomical catalogs in support of cross-correlation with mission observation logs. MAST staff also serve on the Astrophysics Data Centers Coordinating Council.
Major Activities and Accomplishments of the Past Year:
MAST staff have been migrating data acquired from GSFC (ADF, NSSDC, and LASP) on DLT or via FTP onto CD-ROMs. The CDs are then publicly accessible via automated jukebox systems here at STScI. The data have been verified and where necessary FITS formats have been corrected. The following datasets have been loaded on to CD-ROM: IUE Final Archive data, ASTRO-UIT, ASTRO-HUT, and Copernicus. Load of the IUESIPS (older version of the IUE data) is well underway with over 50% of the files written to CD.
MAST has implemented and maintained web sites for all the missions it is supporting, with search and retrieval capabilities, available documentation and software. Databases for each mission have also been developed and when necessary, updated. Guides for reading the data have been developed for many of the missions and will be completed for the remaining missions in the next year. Retrievals for the ASTRO missions are now made via a "point and click" system via a users web browser. Retrievals for IUE data using this method will be implemented soon.
The Hubble Data Archive manual has been updated and now includes a chapter on search and retrieval for the non-HST missions.
MAST has begun to make available carefully chosen atlases or prepared datasets for the supported missions. These initial datasets include atlases of chi Lupi, 10 Lacertae, alpha Orionis, a FOS composite quasar spectrum, and a library of IUE SWP spectra for white dwarfs. A spectral atlas of IUE standard stars will become available soon.
The IUE ESA project created an alternate extraction of the IUE Final Archive data called INES (IUE Newly Extracted Spectra). MAST became a national host for this data set and has maintained a site for it.
As part of the evaluation of IUE and GHRS stellar atlas data, MAST personnel have found a pattern of wavelength errors as a function of wavelength attaining several km/s which are consistent with a 20-year old evaluation of the wavelength system of the Copernicus satellite. It is believed that these errors are caused by wavelength errors in old laboratory measurements. MAST will contact the IAU Commission on Radial Velocities to alert them to this problem.
A set of search/retrieval pages were developed to access the HEASARC ROSAT database. These pages allow MAST users to use search pages that may have a more familiar feel.
MAST Data Ingest Activity
MAST Data Retrieval Activity
Delivery of UIT2 data began in June 1998. The remaining ASTRO missions
have been publicly available for retrieval since November 1998. Access
to IUE data stored at STScI will be provided sometime later this year (1999).
In the interim, MAST provides IUE data access via NDADS at GSFC and the
hits on this retrieval page are listed in the following table.
Plans and Schedule for the Coming Year:
MAST plans to continue to enhance the interoperability and scientific utility of our data holdings in the coming year through the following activities: