The N2K Consortium is a collaborative multinational effort by American,

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

an and

Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...

ese astronomers to find additional

extrasolar planet An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first detect ...

s around stars that are not already being surveyed. The N2K is shorthand for the set of roughly 2,000 of the nearest and most luminous main sequence stars that were selected to be newly surveyed. Target stars have a B - V

color index In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower the color index, the more blue (or hotter) the object is. Conversely, the larg ...

value between 0.4 and 1.2, a

visual magnitude Apparent magnitude () is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction of the object's light ca ...

brighter than 10.5, and a distance of less than 110 pc from the

Sun The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light a ...

. They were selected based upon their high

metallicity In astronomy, metallicity is the Abundance of the chemical elements, abundance of Chemical element, elements present in an object that are heavier than hydrogen and helium. Most of the normal currently detectable (i.e. non-Dark matter, dark) matt ...

, which is the abundance of elements other than hydrogen and helium. The observing campaign uses the Keck, Magellan and

Subaru is the automaker, automobile manufacturing division of Japanese transportation conglomerate (company), conglomerate Subaru Corporation (formerly known as Fuji Heavy Industries), the Automotive industry#By manufacturer, twenty-first largest aut ...

telescopes, plus automated telescopes at Fairborn Observatory. Each star is observed three times over a period of several days, then checked for short period variations in radial velocity. This variation is a characteristic of gravitational perturbation caused by a hot Jupiter. Those stars showing radial velocity variations are then checked with the automated photometric telescopes from Fairborn Observatory. During a two-year run beginning in 2004, the N2K Consortium was predicted to detect about 60 new hot Jupiters. However, by 2009, only seven planets with orbital periods of up to five days had been discovered. They orbit the following stars: * HD 33283 * Bibha * HD 88133 * HD 109749 *

Ogma Ogma () is a god from Irish mythology, Irish and Scottish mythology. A member of the Tuatha Dé Danann, he is often considered a deity and may be related to the Gauls, Gallic god Ogmios. According to the In Lebor Ogaim, Ogam Tract, he is the i ...

Rosalíadecastro HD 149143, also called Rosalíadecastro, is a star with a close orbiting exoplanet in the Ophiuchus constellation. Its apparent visual magnitude is 7.89 (a binocular object) and the absolute magnitude is 3.87. The system is located at a d ...

* Axólotl

References

External links

* {{Portal bar, Astronomy, Stars, Outer space, Education, Science Exoplanet search projects Astronomy organizations

See also

References

External links