Astronomey dating planets
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With a temperature of around 580 °C and having an estimated mass of four Jupiter masses, it is also one of the coldest and least massive directly-imaged exoplanets. Such a world has been discovered by a team of astronomers led by the University of Arizona in Tucson, Arizona, using direct imaging.The planet, HD 131399Ab, is unlike any other known world — on by far the widest known orbit within a multi-star system.
Humanity’s first chance to explore this nearby world may come from the recently announced Breakthrough Starshot initiative, which plans to build fleets of tiny laser-propelled interstellar probes in the coming decades.
Although repeated and long-term observations will be needed to precisely determine the planet’s trajectory among its host stars, observations and simulations seem to suggest the following scenario: At the centre of the system lies a star estimated to be eighty percent more massive than the Sun and dubbed HD 131399A, which itself is orbited by the two remaining stars, B and C, at about three-hundred AU (one AU, or astronomical unit, equals the average distance between the Earth and the Sun).
All the while, B and C twirl around each other like a spinning dumbbell, separated by a distance roughly equal to that between our Sun and Saturn.
Argo, the ship of Jason and the Argonauts, sails across the south tonight.
It originally was a single constellation, but astronomers broke it into four smaller ones: Carina, the keel; Vela, the sail; Puppis, the poop deck; and Pyxis, the compass. After tonight, it will no longer be the “evening star.” Instead, it will be the “morning star,” as it crosses the line between Earth and the Sun.
The star that represents the head of Hercules rises below his body.
It is called Rasalgethi, and it actually consists of three individual stars. Spring has already sprung, but a great pattern of stars named for winter still dominates the western evening sky.The Winter Circle includes some of the most prominent stars of all, including Sirius, the brightest star in the night sky.The discovery is published online by the journal Science.Located about 340 light-years from Earth in the constellation Centaurus, HD 131399Ab is believed to be about 16 million years old, making it one of the youngest exoplanets discovered to date, and one of very few directly imaged planets.This crossing is known as inferior conjunction, and it happens every 584 days. Perigee March 3, 30 Apogee March 18 The full Moon of March is known as the Sap Moon, Worm Moon, or Lenten Moon.