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News Release Archive:

News Release 572 of 967

June 4, 2001 12:30 PM (EDT)

News Release Number: STScI-2001-18

Bigger, Better Catalog Unveils Half a Billion Celestial Objects

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Image: Bigger, Better Catalog Unveils Half a Billion Celestial Objects

Bigger, Better Catalog Unveils Half a Billion Celestial ObjectsSTScI-PRC2001-18

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ABOUT THIS IMAGE:

These frames are samples from the photographic sky surveys, which have been digitized by a technical team at the Space Telescope Science Institute to support the Hubble Space Telescope operations. The team processed these images to create a new astronomical catalog, called the Guide Star Catalog II. This project was undertaken by the Space Telescope Science Institute as an upgrade to an earlier sky survey and catalog (DSS-I and GSC-I), initially done to provide guide stars for pointing the Hubble Space Telescope. By virtue of its sheer size, the DSS-II and GSC-II have many research applications for both professional and amateur astronomers.

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An example from the DSS-II shows the Rosette Nebula, (originally photographed by the Palomar Observatory) as digitized in the DSS-I (left) and DSS-II (right). The DSS-II includes views of the sky at both red and blue wavelengths, providing invaluable color information on about one billion deep-sky objects.

[Bottom]

This blow-up of the inset box in the raw DSS-I scan shows examples of the GSC-I and the improved GSC-II catalogs. Astronomers extracted the stars from the scanned plate of the Rosette and listed them in the catalogs. The new GSC-II catalog provides the colors, positions, and luminosities of nearly half a billion stars — over 20 times as many as the original GSC-I. The GSC-II contains information on stars as dim as the 19th magnitude.

Object Name: Rosette Nebula

Image Type: Astronomical/Illustration

Credit: NASA, the DSS-II and GSC-II Consortia (with images from the 'Palomar Observatory-STScI Digital Sky Survey of the northern sky, based on scans of the Second Palomar Sky Survey are copyright 1993-1999 by the California Institute of Technology)

NEWS RELEASE IMAGES

The above montage includes these images:

DSS-I Image Type: Astronomical DSS-I DSS-I Image Type: Astronomical DSS-I GSC-I Image Type: Astronomical GSC-I GSC-II Image Type: Astronomical/Illustration GSC-II

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