Kerr Watch

Elapsed time since Richard Kerr failed to inform his Science readers of the confirmation of nanodiamonds at the YDB: 6 years, 2 months, and 4 days

NASA mentions

I have been interested for some time whether the WISE mission now underway is able to confirm or refute, in part, the widely dismissed theories of Bill Napier and the British NEO catastrophists.  In particular, that the solar system is host to dangerous dark bodies as well as the better known and more easily spotted bright comets and reflective asteroids.  [See:  Extreme albedo comets and the impact hazard  W.P. Napier, J.T. Wickramasinghe] And further that these dark bodies are not now accounted for in the widely relied upon impact frequency estimates.

A composite of images from NASA's Deep Space 1 spacecraft shows features of comet Borrelly's nucleus, dust jets escaping the nucleus and the cloud-like "coma" of dust and gases surrounding the nucleus. False colour is used to reveal details of the jets and coma (Image: JPL / NASA)

[See also: Dark Comets may pose threats to Earth from New Scientist]

In fact, last year, I poked around the net to see if the pending WISE could “see” these cometary ghosts.  I managed to locate references to asteroid and NEO detection as planned tasks for WISE — but, strangely, no mention of the terms or “dark comet,” or “dead comet,” in connection with the WISE mission.

Around the same time, I had the good fortune to exchange an email with Dr. Napier on another subject, and I took the opportunity to ask him whether the pending WISE mission would indeed be capable of and tasked appropriately to locate his ‘dark’ comets. I should dig up the email, but I recall Napier told me it would NOT be capable of performing such tasks. I was disappointed.

Now, less than two month into the mission, NASA confirms the agency is indeed looking for “dark” or “dead” comets:

NASA Jet Propulsion Laboratory Press Release: WISE mission

Though this particular body is actively shedding dust, WISE is also expected to find dark, dead comets. Once a comet has taken many trips around the sun, its icy components erode away, leaving only a dark, rocky core. Not much is known about these objects because they are hard to see in visible light. WISE’s infrared sight should be able to pick up the feeble glow of some of these dark comets, answering questions about precisely how and where they form.

“Dead comets can be darker than coal,” said Mainzer. “But in infrared light, they will pop into view. One question we want to answer with WISE is how many dead comets make up the near-Earth object population.”

The mission will spend the next eight months mapping the sky one-and-a-half times. A first batch of data will be available to the public in the spring of 2011, and the final catalog a year later. Selected images and findings will be released throughout the mission.

If the Mark Bosloughs, Allan Harisses and David Morrisions of the world are correct in their confident estimates of the Near Earth Object population — a critical figure in estimating impact frequency —  they would need to account accurately for these elusive dark beasts.  As far as I can find they have never even mentioned them.

Moreover, as far as I can tell from exhaustively searching the the JPL and NASA web sites, NASA has never once mentioned (as far the internet is concerned) that locating “dark” or “dead” comets was a task for WISE. Until this week.

Here is search of the occurrence of the terms “dark comet” and “dead comet” in association with the term “WISE”

So why does NASA now casually slip into a press release a stated objective of finding “dark” comets using WISE? Could it be because they intended to look for them, but wanted to find some prior to admitting their existence was on the table — thus revealing the built-in uncertainty in impact threat estimates?

That seems highly likely to me now.  Unless, of course, there are some ‘dark’ facts not visible on the Internet indicating NASA has been forthright about their interest in dark objects.

  • I have through my quite limited research into the frequency of Earth threatening objects come to conclude that the estimates of Dr. Morrison and scientists like him have greatly underestimated the threat to our planet. Wouldn’t it be satisfying for Dr. Napier’s views to finally be accepted as at least possible? The frightening aspect of this is that as Dr. Han Kloosterman indicates Earth must then be regarded as being subject to a much greater impact threat than is commonly believed by the majority of scientists.

  • E.P. Grondine

    The data I gathered for my book “Man and Impact in the Americas” indicates that at least Clube and Napier’s recent Comet Encke fragment impact model is correct.

    Further, as near as I could determine, NASA’a impact estimates have been off by nearly an order of magnitude, both for smaller and larger impacts.

    From what I could make out, the root of this lies with Dr. Morrison’s early adoption of and promotion of Muller’s Nemesis Hypothesis, that a nearby dark body has been injecting asteroids, and I believe that part of WISE’s primary mission was to search for that hypothesized body.

    Morrison has claimed that the geological data from the Apollo Moon missions supports the asteroid only impact model, but the Moon is part of a two body system, the Earth and the Moon.

    As a consequence, in an amazing bit of circular reasoning, NASA simply takes estimates of the asteroid population and infers impact rates. They then use these dates to date other planetary surfaces. Periodicity shown in Mars strata is not accounted for.

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