SAO TDC: Computing Resources and Catalogs
The Telescope Data Center makes available computers for the
reduction of ground-based telescope data of all types. The
current communal machine is named tdc2 and is
a Dell PowerEdge R900 with 8 3.0-GHz cpus and 128 GB of memory.
The tdc2 computer is open for use by
anyone with a CF-domain account who has telescope data to reduce.
The TDC also has priority on 8 nodes of the hydra computing
cluster. Separate accounts, as managed by the CF, are required to get onto
We are not currently trying to enforce the use of the
tdc2 system to only those with optical and infrared
ground-based data. We do have a priority order, however:
The TDC maintains local copies of most of the largest astronomical
catalogs, including the USNO-B1.0, 2MASS Point Source Catalog, and
many others, with similar interfaces to other large catalogs which
are not distributed, such as the GSC II.
A selection of the SDSS Data Release 7 (DR7) databases and associated
files has been transferred to CFA. Each of these has been condensed by
choosing a (we hope!) useful subset of the columns, and converted the
Starbase table format.
The TDC maintains a public archive of reduced spectra from several
of our low-dispersion spectrographs on Mt. Hopkins in Arizona.
The TDC maintains raw data archives of FLWO, MMTO and Magellan instruments.
Most FLWO and MMTO data is brought to Cambridge automatically by the internet
and taped. The data remains available (to users with appropriate
permissions) on disk as space permits. The entire data set of all the
current MMT F/5 SAO and FLWO Ridge instruments are kept on disk.
- Reduction of MMTO, FLWO, and Magellan data
- Non-CFA optical ground-based data reduction
- Non-optical ground-based data reduction
- Everything else
Magellan data is
contributed by observers and PIs and stored locally on
disk and on tape. The TDC makes no other use of this data. There are two
summary files of the data in this archive, one sorted by date:
magellan_date.db and one sorted by PI:
For FLWO and MMT data, see the
summary table for details.