Strong Signal From Space


The SETI Institute is currently investigating a radio signal, which is originating in the Hercules constellation, in the vicinity of the star system HD 164595. Russian astronomers detected a very strong signal from this region in 2015, but did not release this information until recently.

HD 164595 b is a confirmed exoplanet orbiting around a sun-like star HD 164595 every 40 days some 94.36 light-years away. It is believed to be a Neptune-like, gassy planet incapable of supporting life. The planet has a mass of 16 Earth masses. The recent (2015) radio signal at 11 GHz (2.7 cm wavelength) has been observed from the HD 164595 stellar system. It is unknown whether this planet is the origin of the signal, but it could instead be gravitational lensing from a more distant source. SETI investigators are looking into it, but the chances of the signal being extra-terrestrial are considered slim, at best.

Gravitational Lensing

HD 164595

The planetary system HD 164595 hosts at least one planet.

System parameters
Primary system name HD 164595
Alternative system names N/A
Right ascension 18 00 38.89431
Declination +29 34 18.9202
Distance [parsec] 28.9±0.4
Distance [lightyears] 94.4±1.3
Number of stars in system 1
Number of planets in system 1

Architecture of the system

This list shows all planetary and stellar components in the system. It gives a quick overview of the hierarchical architecture.

  • HD 164595, stellar object
    • HD 164595 b, planet, semi-major axis: 0.230 AU

Planets in the system

This table lists all planets in the system HD 164595.

HD 164595 b
Alternative planet names BD+29 3165 b, HIP 88194 b, 2MASS J18003890+2934188 b, PPM 106642 b, TYC 2103-1620-1 b
Description As part of a dedicated radial velocity survey devoted to search for low-mass planets around a sample of 190 bright solar-type stars in the northern hemisphere, the SOPHIE search for northern extra-solar planets reports the detection of this warm Neptune.
Lists Confirmed planets
Mass [Mjup] 0.051±0.008
Mass [Mearth] 16±3
Radius [Rjup] N/A
Radius [Rearth] N/A
Orbital period [days] 40.0±0.2
Semi-major axis [AU] 0.230
Eccentricity 0.09+0.12−0.07
Equilibrium temperature [K] N/A
Discovery method RV
Discovery year 2015
Last updated [yy/mm/dd] 15/06/29
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