Rio scale

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538 analyzes the search for an alien signal, opining that although the work of "alien hunting, commonly referred to as the Search for Extraterrestrial Intelligence, or SETI, is still very much relegated to the sidelines," it's become a "cutting edge" pursuit:

Occasionally, promising signals make their way through the broader astronomical community and into the public eye. A few such claims have made headlines recently, prompting some astronomers to call for a new framework to rank and interpret these signals.

"To help with this," she writes, "astronomers came up with a way to gauge the credibility of a SETI signal, called the Rio scale," where "an answer of 0 is obviously nothing and a 10 is 'wow, aliens are calling':"

Formulated at an astronomical conference in Rio de Janeiro in 2000, it's a 10-point scale intended to help people understand when to take an apparent signal from another world seriously. [...]

RS=Q⋅δ

In this equation, Q is the sum of numerical values assigned to three parameters: the class of phenomenon, such as whether it's an "obviously Earth-directed message" or a randomly swooping beacon; the type of discovery, like whether it's a steady signal or something that comes and goes; and the distance to the signal. The latter is important because you'd want to know how long it would take for aliens to receive a reply.

Each parameter has a numerical value from 1 to 4, 5 or 6.1 For instance, "an Earth-specific beacon designed to draw attention" gets a 4. If it's within the galaxy, add 2. If it was a passing signal detected once, it gets another 2. To get your Rio scale value, you multiply this sum by δ, which is a measure of the credibility of the claim. The values for δ go from 0 to 2/3. If it's uncertain but worth checking out, for example, that's 1/6. This quantity depends on experts' opinions, so it's inherently subjective. And unless a signal has been verified repeatedly by SETI experts, the δ value is almost certain to drop its total value to a 2 or a 3.

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This page contains a single entry by cognitivedissident published on October 27, 2016 2:10 PM.

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