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LSST drift scanning

LSST drift scanning

Owned by Christopher Stubbs
Jun 12, 2013

Notes on using LSST for space junk monitoring. June 11 2013, C. Stubbs

Plate scale is 0.2 arc sec/pixel. 

Each amplifier segment is 2000 pixels high. 

Sky goes by at a rate of 15 arc sec/sec, which is a row rate of 15/.2=75 rows per sec. With 512 pixels per row, that's a leisurely rate of 38.4 Kpix/sec.Integration time is 2000/75=26.6 sec on the equator.

There are 21 science rafts, only half the amplifiers contribute to drift scan integrations. Most objects transit across 5 CCD's, so net integration time is 5*0.5=2.5 minutes. 

If we do TDI readout at a rate R, things streak at (track-R) and (track+R) on either side of the CCD midline. 

 

 

 

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