Ross 128

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Mysteriöse Signale von einem roten Zwerstern, oder nur Interferenz von irdischen Kommunikationssatelliten?

Ross 128

Unexplained Signal: On May 12, 2017, researchers picked up mysterious signals using the Arecibo Observatory. Abel Méndez, an astrobiologist at the University of Puerto Rico at Arecibo, said the star was observed for 10 minutes, during which time the wide-band radio signal was "almost periodic" and decreased in frequency. On July 16, 2017, the strange signal, at a low frequency never heretofore observed from a red dwarf, was reported on Twitter by Méndez to have been "confirmed". No such signal was detected by the Green Bank Telescope, however, which raises the likelihood that said signal was radio frequency interference from an artificial satellite orbiting the Earth.

Mittlerweile verdichtet sich der Verdacht, dass es sich dabei um Signale von geostationären Satelliten handelt, die zur Zeit des mysteriösen Signals auf einer ähnlichen Position wie der Stern standen.

J.E. Enriquez et al. Follow-up of the Reported Transient Signal Observed at the Arecibo Telescope in the Direction of Ross 128

 
Wäre ja nicht der 1. Fall von scheinbar außerirdischen Signalen. In Australien hat ja mal eine Mikrowelle für Aufruhr gesorgt.
 
Mittlerweile hat man mit HARPS auch bei diesem roten Zwergstern

Ross 128

im Sternbild Jungfrau einen erdähnlichen Planeten gefunden. Der Orbit mit einer Umlaufzeit von 9,9 Tagen liegt am inneren Rand der habitablen Zone.

Ross 128 ist nach Proxima Centauri der zweitnächste Stern mit einem erdähnlichen Exoplaneten. Der Stern hat derzeit eine Entfernung von 11 Lj, nähert sich uns jedoch und wird in 79 000 Jahren näher als Proxima Centauri herankommen.

A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs

We report on our radial velocity observations of Ross 128 (Proxima Virginis, GJ447, HIP 57548), an M4 dwarf just 3.4 parsec away from our Sun. This source hosts an exo-Earth with a projected mass m sin i = 1.35 M⊕ and an orbital period of 9.9 days. Ross 128 b is the second closest known exo-Earth, after Proxima Centauri b (1.3 parsec), and the closest temperate planet known around a quiet star.

Closest temperate world orbiting quiet star discovered

Although it is currently 11 light-years from Earth, Ross 128 is moving towards us and is expected to become our nearest stellar neighbour in just 79 000 years - a blink of the eye in cosmic terms. Ross 128 b will by then take the crown from Proxima b and become the closest exoplanet to Earth!

With the data from HARPS, the team found that Ross 128 b orbits 20 times closer than the Earth orbits the Sun. Despite this proximity, Ross 128 b receives only 1.38 times more irradiation than the Earth. As a result, Ross 128 b's equilibrium temperature is estimated to lie between -60 and 20°C, thanks to the cool and faint nature of its small red dwarf host star, which has just over half the surface temperature of the Sun.

 
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