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Asteroid impact probability and Torino scale markets

Newly discovered asteroids occasionally earn a nonzero impact probability, and headlines can make a few percent sound alarming. Event contracts sometimes ask whether an object will reach a given Torino rating or whether its impact probability will exceed a threshold by a date. This SoftCta guide explains how agencies compute these figures, what the scales mean, and why the typical pattern — probability rising, then collapsing to zero — is normal orbital updating rather than a sign of drama.

Who keeps the lists

NASA’s Center for Near Earth Object Studies runs Sentry, an automated system that lists objects with nonzero impact probabilities over the next century. ESA’s Near-Earth Object Coordination Centre keeps its own risk list. Both update as new observations arrive, and their figures can differ at a given moment because of modeling and data choices. SoftCta readers copy which list and which field the contract names.

The Torino and Palermo scales

The Torino scale runs from 0 to 10 and combines impact probability with estimated impact energy for public communication. A rating of 0 means no hazard and most listed objects stay there. The Palermo scale is logarithmic and compares an object’s risk with the background risk from all objects; values below minus 2 are routine. A contract on a Torino rating does not settle on a Palermo value, and vice versa.

Why probabilities rise, then fall

Right after discovery, the possible orbits form a long uncertainty region. If Earth lies inside it, the impact probability is small but nonzero. New observations shrink the region; while Earth stays inside, the probability can rise. When the region shrinks enough, Earth usually falls outside and the probability drops to near zero. Our Bayesian updating guide explains why this is ordinary evidence accumulation.

Real cases

Apophis briefly held elevated ratings after its 2004 discovery; later observations ruled out impact for 2029 and, by 2021, for the coming century. In early 2025, 2024 YR4 reached a Torino rating of 3 with an estimated 2032 impact probability above 3 percent, then fell to near zero for Earth within weeks, while a small chance of lunar impact remained. SoftCta readers use these cases as a reference class.

A worked example

A contract asks whether a newly found asteroid will be rated Torino 2 or higher on the named list by month-end, priced at an illustrative 12 cents Yes. Its current rating is 1, telescopes will observe it over the next two weeks, and the object will soon move into a less observable position. The reader weighs the rise-then-fall pattern against limited observation time, converts with the implied probability tool, and verifies live cents. Substantial risk of loss.

Common mistakes

Reading a rising probability as a trend toward impact. Treating a rating from one agency as the other’s. Confusing a close approach distance with impact risk. Letting vivid headlines drive the price, as our availability heuristic guide warns. SoftCta pages avoid sure-thing calls.

Primary sources SoftCta readers open

SoftCta readers open NASA CNEOS Sentry object pages, the ESA NEOCC risk list and the Minor Planet Center for observation records. They note the list, field, timestamp and any time zone, and keep news articles, social posts and amateur orbit plots in a context column.

Reading the quote step by step

• Read the full title and rules, including the named settlement source and the time zone.
• Convert the Yes and No prices to implied probabilities and note the gap between them.
• Subtract fees and spread to see the effective price you would actually face.
• Write your own probability range and the evidence behind it, then compare.
• Check related and near-duplicate markets on other venues for consistency.

Closing SoftCta checklist

• Re-read the venue definition in your own words before reacting to a price.
• Convert prices with fee and spread awareness; verify live cents on the operator.
• Prefer primary settlement sources over secondary headlines and social summaries.
• Treat ChanceWire hubs, movers, and tools as orientation — not order entry.
• Confirm age, location, and product eligibility; SoftCta pages will not suggest location spoofing.
• If clarity is incomplete, watching is a complete SoftCta outcome — no pick-selling urgency required.

SoftCta habits

• Write your own probability range before checking the crowd price.
• Prefer dated primary sources over social summaries.
• Compare related markets when a single book looks extreme.
• Size curiosity with fees and depth in mind; substantial risk of loss.