From E.P. Grondine on Meteorite List:
Following a quote at https://cosmictusk.com from astronomer Bill Napier on the abilities of WISE to detect dead comet fragments, I wrote him asking him about it. As his reply also deals with some meteorites' parent bodies (Tagish Lake being prominent) and the composition of comet cores, I think meteorite list participants should find it of interest, and here it is: "A population of extremely dark Earth-crossing comets in Halley-type orbits is inferred to exist on dynamical balance grounds. These would be undetectable visually but bright in the satellite infrared."Unfortunately these very dark bodies spend the great bulk of their time beyond the orbit of Mars and it would take many centuries to map out the system to say 90% completeness with present-day technology, even with infrared survey telescopes. "Another class of dormant comets difficult to detect would be, fragments which are simply too small to be seen easily, but which might pack a punch either individually or collectively. If these have been around awhile, the very dark organics on the surfaces might have disappeared leaving a stony asteroid surface spectrum (the "asteroid" Phaethon, which gives rise to the Geminid meteor stream, is a probable example of this). "They can be regarded as part of the general population of sub-kilometre near-Earth objects. Direct detection of these objects, sub-kilometre but with higher albedos, should be possible with next generation telescopes, in particular the Large Synoptic Survey Telescope, and even with present-day Spaceguard telescopes if they run for long enough. The Comet Encke infrared trail may contain a concentration of such bodies but we are a safe 600 years away from intercepting it. "The best chance of detecting small bodies through occultation is probably arises through orbits crossing the face of the moon and sun. Duncan Steel and I had an exchange on this some years ago, and he told me that there are many instances of dark objects having been reported to cross the face of the Sun in the past. Unfortunately I don't think there has ever been a systematic attempt to collate this information. But yes, in principle one could put limits on the numbers of small fragments in this way. "The 2022 (SW3) encounter will surely yield a meteor storm, and possibly an enhanced risk of encountering a larger body within it, but I'm sorry that I can't give any quantitative estimates -- the work simply hasn't been done, to my knowledge. Best regards, Bill Napier" E.P. Grondine Man and Impact in the Americas