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24 votes

Vera C. Rubin's LSST's ginormous camera's shutter; why does it open/close 1000 times a night & is this typical for large-format survey telescopes?

From Technology of the LSST focal plane: LSST’s survey efficiency depends on the telescope’s ability to rapidly move from field to field on the sky during a night’s observing. The mount has been ...
John Doty's user avatar
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17 votes
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Is this an image of an astronomical observatory? If not, what's behind these domes?

It is indeed an astronomical observatory: University of Canterbury Mt John Observatory, located atop Mount John in New Zealand. Coordinates 43°59'6.99"S 170°27'50.76"E if you want to look ...
Jean-Marie Prival's user avatar
16 votes
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Vera C. Rubin's LSST's ginormous camera's shutter; why does it open/close 1000 times a night & is this typical for large-format survey telescopes?

The "sequence" of a CCD exposure might be to flush the CCD to get rid of all charge on the silicon, with the shutter closed; open the shutter; expose the CCD to astronomical light; close the ...
ProfRob's user avatar
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2 votes

Vera C. Rubin's LSST's ginormous camera's shutter; why does it open/close 1000 times a night & is this typical for large-format survey telescopes?

why does it open and close a thousand times a night? The other answers, while correct and fascinating, are completely irrelevant. The CCD readout time is important to the designers, but irrelevant to ...
Miss_Understands's user avatar
2 votes

Vera C. Rubin's LSST's ginormous camera's shutter; why does it open/close 1000 times a night & is this typical for large-format survey telescopes?

Supplemental, re-explaining answer post for those like me who are not so familiar with CCDs. I find the video below very helpful. Of the five readout systems illustrated, the two relevant here are: ...
uhoh's user avatar
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