Friday, 27 April, 2018

Never Before Seen Binary Asteroid 288P

Never Before Seen Binary Asteroid 288P

Posted on Sunday, 24 September, 2017 by Zheluo Cai

Never Before Seen Binary Asteroid 288P.

Asteroids are primitive Solar System bodies that evolve both collisionally and through disruptions arising from rapid rotation^. These processes can lead to the formation of binary asteroids and to the release of dust, both directly and, in some cases, through uncovering frozen volatiles. In a subset of the asteroids called main-belt comets, the sublimation of excavated volatiles causes transient comet-like activity. Torques exerted by sublimation measurably influence the spin rates of active comets and might lead to the splitting of bilobate comet nuclei. The kilometre-sized main-belt asteroid 288P (300163) showed activity for several months around its perihelion 2011, suspected to be sustained by the sublimation of water ice and supported by rapid rotation, while at least one component rotates slowly with a period of 16 hours. The object 288P is part of a young family of at least 11 asteroids that formed from a precursor about 10 kilometres in diameter during a shattering collision 7.5 million years ago. 288P is a binary main-belt comet. It is different from the known asteroid binaries in its combination of wide separation, near-equal component size, high eccentricity and comet-like activity. The observations also provide strong support for sublimation as the driver of activity in 288P and show that sublimation torques may play an important part in binary orbit evolution. Credit: Published Paper A Binary Main-Belt Comet by Jessica Agarwal et al., in Nature 25 July 2017.

Read Article Here:

https://phys.org/news/2017-09-hubble-unique-solar.html

NGC 7635: The Bubble Nebula.
Image Credit & Copyright: Larry Van Vleet. NGC 7635, the Bubble Nebula, is being pushed out by the stellar wind of massive central star BD+602522. Next to it is a giant molecular cloud, visible to the right. The cloud is able to contain the expansion of the bubble gas but gets blasted by the hot radiation from the bubble's central star causing it to glow. The Bubble Nebula is part of a much larger complex of stars and shells. The Bubble Nebula is about ten light-years across towards the constellation of the Queen of Aethiopia (Cassiopeia).

The flag of Liechtenstein consists of two horizontal blue and red bands charged with a gold crown at the canton. Adopted in 1921 after being officially enshrined into the nation's constitution, it has been the flag of the Principality of Liechtenstein since that year. The crown was added to the flag in 1937. The blue represents the sky, while red alludes to the "evening fires" that are lit inside houses throughout the country. The crown epitomizes the "unity of the people and their prince."

Kyrgyzstan – Level 1: Tuesday, 24 April, 2018
Exercise normal precautions in the Kyrgyz Republic. Read the Safety and Security section on the country information page. If you decide to travel to the Kyrgyz Republic: Enroll in the Smart Traveler Enrollment Program (STEP) to receive Alerts and make it easier to locate you in an emergency. Follow the Department of State on Facebook […]
Nicaragua – Level 3: Reconsider travel Monday, 23 April, 2018
Reconsider travel to Nicaragua due to crime and civil unrest. On April 23, 2018, the U.S. government ordered the departure of U.S. government family members and authorized the departure of U.S. government personnel. Political rallies and demonstrations are occurring daily, often with little notice or predictability. Some protests result in injuries and deaths. Demonstrations typically […]

Eugène Galien-Laloue (1854–1941) was a French artist of French-Italian parents and was born in Paris on December 11, 1854. He was a populariser of street scenes, usually painted in autumn or winter, of the early 1900s, accurately representing the era in which he lived: a happy, bustling Paris, la Belle Époque, with horse-drawn carriages, trolley cars and its first omnibuses. Galien-Laloue's works are valued not only for their contribution to 20th-century art but for the actual history, which they document. The Paris Arc de Triomphe was painted in 1941. His work can be seen at the Musée des Beaux-Arts, Louvier; Musée des Beaux-Arts, La Rochelle; Mulhouse, France.

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