The primary mode of access to the 2MASS First Incremental Data Release products is via the on-line services of the NASA/IPAC Infrared Science Archive (IRSA) services.
Logical queries on the First Release PSC and XSC can be made via the "CATSCAN" on-line tool. CATSCAN allows the Catalogs to be searched by specifying position, brightness, or a number of other constraint. Both a simple "Query-by-Table" interface or a more flexible direct-SQL query input mode can be utilized to search the catalogs.
Note - CATSCAN is not designed to support full-downloads of the First Release Catalogs
FITS format images from the 2MASS First Release Image Atlas may be retrieved using the IRSA 2MASS Survey Visualization and Image Server service. Images may be requested on the basis of input coordinates or object names. Users may obtain full J, H and KsAtlas Images, or a specified subimages.
Note - The 2MASS Survey Visualization and Image Server returns FITS images that are expanded from lossy-compressed Atlas Images. Photometry from the PSC and XSC should always take precedent of photometry from these images.
Full-resolution, background-subtracted images centered on
objects contained in the 2MASS First Release XSC can be retrieved
using the IRAS 2MASS Extended Source Full-Resolution Image Server .
Users may specify the coordinate of the 2MASS XSC source, or object
name, and the service returns the J, H and Ks postage
stamps, along with a 3-color image of the source, and basic catalog
Coordinate Coverage Check tool allows user to determine if an equatorial
position of interest is included in the First Incremental Data Release
The 2MASS First Release Catalogs and Scan Information Table may be retrieved in compressed ascii form via anonymous ftp. File compression was done using gzip.
Users should be aware that the catalog tables are extremely large. The largest table, the PSC, has been broken into eight sections for convenience, but each compressed section is still ~240 MB in size. Uncompressed the PSC occupies a total of 7.72 GB. The table below summarizes the tables available via ftp and their sizes.
2MASS Catalogs and Tables available via anonymous ftp: File No.Records StartRA EndRA Full Size Comp.Size -------------------------------------------------------------------- ptsrc1.tbl 2525548 1.369038 68.991717 964760978 246312030 ptsrc2.tbl 2525548 68.991800 88.833294 964760978 243604108 ptsrc3.tbl 2525548 88.833307 100.346687 964760978 243698060 ptsrc4.tbl 2525548 100.346702 188.939536 964760978 245040821 ptsrc5.tbl 2525548 188.939745 287.908680 964760978 236302582 ptsrc6.tbl 2525548 287.908681 293.691041 964760978 230860434 ptsrc7.tbl 2525547 293.691043 297.715792 964760596 233815842 ptsrc8.tbl 2525543 297.715795 359.398120 964759068 239309695 extsrc.tbl 73980 1.375096 359.393768 243111538 45437467 scaninfo.tbl 3391 1.438408 359.327857 1378408 347990
% ftp anon-ftp.ipac.caltech.edu
[Login as anonymous, use your email address as the password] Name (anon-ftp:) anonymous Password: [your email address]
ftp> cd /pub/2mass/idr1
ftp> dir [To list file names] ftp> binary ftp> get [filename] ... ... ftp> bye
A DVD-ROM containing the 2MASS First Release PSC and XSC is available. If you are interested in ordering this product, please fill out the order form. Quantities and availability are limited.
[Last Update: 2000 May 8; R. Cutri]