Difference: ZtfFirstLightPressRelease (6 vs. 7)

Revision 72017-11-13 - QuanzhiYe

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META TOPICPARENT	name="ZtfPR"

Material on SWG science for the first light press release

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Most asteroids are gravitationally bounded “rubble-piles”. Rubble-pile asteroids cannot have rotation periods less than a critical limit. It has been found that a small number of asteroids have rotation periods shorter than this limit, implying that they may be monolithic. PTF had discovered 3 of 6 super-fast rotators (SFRs) known to date. With its large sky coverage and high cadence, ZTF can improve our knowledge of the SFR population.

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Comet outbursts can be spectacular, turning a modestly active comet into a naked eye objects. From Rosetta and Deep Impact we know that smaller outburst may occur daily. But we do not know the frequency and intensity distribution of outbursts in the comet population. ZTF’s wide and frequent coverage will enable us to conduct systematic observation of the known population of comets and other icy bodies.

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Comet outbursts can be spectacular, turning a modestly active comet into a naked eye objects. From Rosetta and Deep Impact we know that smaller outburst may occur daily. Larger outburst happens occasionally, but we do not know the frequency and intensity distribution. Many are caught by amateur astronomers. This will change with ZTF, which will pick up between 30 to 50 comets every time it scans the whole sky. Comets are found all over the sky, so we’re interested in seeing as many of them as we can, in as much detail as possible.

illustration (PTF image of comet ISON)

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