SETI Candidate Signal In Hercules

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SETI Candidate Signal In Hercules

Postby toucana on August 30th, 2016, 8:50 pm 

Scientists are studying reports of a strong SETI candidate signal in the direction of HD 164595, a star system about 95 light-years from earth in the direction of Hercules.

http://www.centauri-dreams.org/?p=36248

The signal was originally found by Russian astronomers in May 2015 using the RATAN-600 radio telescope in Zelenchukskaya, at the Northern foot of the Causcasus mountains.

The wavelength of the reported signal is 2.7cm, equivalent to a frequency of 11GHz. The beam is about 20 arcsec by 2 arcmin. The estimated amplitude of the signal is 750 m.J.y.

HD 164595 is a star of 0.99 solar masses with an estimated age of 6.3 billion years. It is known to have one Neptune size planet HD164595b in a tight circular orbit with a period of 40 days, though other planets may still be undetected in the system.

On the basis of the signal strength observed, researchers say that if it came from an isotropic beacon, then the power budget required would be that of a Kardashev Type II civilization. If it were a narrow beam signal focused in the direction of our solar system, it would be of a power available to a Kardashev Type I civilization.

Many scientists will remain sceptical about whether the signal is the work of an extraterrestrial civilization. Some point out that the 11GHz band is commonly used for terrestrial military transmissions.

Researchers in Paris led by Jean Schneider are considering the possible microlensing of a background source by HD164595. But the signal is provocative enough that the RATAN-600 researchers are calling for permanent monitoring of this target.

The discovery and work to understand its origin will be discussed at a SETI committee meeting during the 67th International Astronautical Congress in Guadalajara, Mexico, on Tuesday, September 27.
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Re: SETI Candidate Signal In Hercules

Postby TheVat on August 30th, 2016, 10:44 pm 

2.7 cm seems very unlikely for SETI signals. Hydroxyl radical radiates at 18 cm and H at 21 cm, and those are the "waterhole" bands where you'd most likely want to talk with ET. As for a K2 civ, what are they messing with an isotropic transmitter for? And a narrow beam pointed at us wouldn't be set so far outside the waterhole bands. Even if it had nothing to do with us, why pick a noisier interstellar band when hydrogen and hydroxyl are natural low-noise channels? This is bogus.
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Re: SETI Candidate Signal In Hercules

Postby TheVat on August 31st, 2016, 12:36 pm 

I also take issue with the Kardashev scale, which seems to assume that technology ascends ever upwards in raw energy needs. Kind of like assuming, in 1750, that 2016 will be a world where donkeys were bred larger and given higher-grade feed, so they could turn more powerful cranks for moving sidewalks and granaries.
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Re: SETI Candidate Signal In Hercules

Postby toucana on September 3rd, 2016, 7:26 pm 

According to a new TASS report, this observation is now being written off as interference from a classified Russian military satellite whose details weren't entered into any catalogue of celestial objects.

http://www.theregister.co.uk/2016/09/02/secret_spy_sat_scrambled_seti_search/
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Re: SETI Candidate Signal In Hercules

Postby TheVat on September 3rd, 2016, 8:04 pm 

Many thanks for the followup, Toucan. I was ranting in a vacuum there.
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