First Light for the Sloan Digital Sky Survey

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Scientific paper

The Sloan Digital Sky Survey imaging camera and telescope saw First Light on May 10, 1998. The camera is designed to take imaging data down to r'=23 in 5 bandpasses covering the visible spectrum from the UV atmospheric cutoff to the IR cutoff of the silicon CCDs. It is used in driftscanning mode at the focus of the SDSS's dedicated 2.5m telescope, giving a field 2.5 degrees wide with a scale of 0.4 arcsec per pixel. This focal plane is imaged with 30 2048 x 2048 CCDs for the photometic data, 6 CCDs in each of the 5 filters, and 24 additional 2048 x 400 CCDs for astrometric calibration and focus monitoring. Each driftscan records data in all five filters, one following the other as the focal plane moves across the sky, so that an object passes through each filter within minutes of the others. A single eight-hour scan covers 160 square degrees in all five filters and generates 250 GBy of raw data which is sent to an on-line data handling system. The Sloan Digital Sky Survey (SDSS) will acquire photometric data with this camera over a quarter of the whole sky centered on the North Galactic Pole. We report here on this first demonstration of our capability to make a deep, high-resolution, mulitband, digital map of the sky.

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