Alpha Andromedae

Alpha Andromedae (Alpha And, α And, α Andromedae), which has the traditional names Alpheratz (or Alpherat from the Arabic word الفرس) and Sirrah (or Sirah), is the brightest star in the constellation of Andromeda. Located immediately northeast of the constellation of Pegasus, it is the northeastern star of the Great Square of Pegasus. Ptolemy considered Alpha Andromedae to be shared by Pegasus, and Bayer assigned it a designation in both constellations: Alpha Andromedae (α And) and Delta Pegasi (δ Peg). When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.

It is located 97 light-years from Earth. Although it appears to the naked eye as a single star, with overall apparent visual magnitude +2.06, it is actually a binary system composed of two stars in close orbit. The chemical composition of the brighter of the two stars is unusual as it is a mercury-manganese star whose atmosphere contains abnormally high levels of mercury, manganese, and other elements, including gallium and xenon. It is the brightest mercury-manganese star known.

Deca

Deca or DECA may refer to:

See also

Deca-

Deca- or deka- (symbol da) is a decimal unit prefix in the metric system, denoting a factor of ten. The term is derived from the Greek deka (δέκα), meaning "ten".

The prefix was a part of the original metric system in 1795. It is not in very common usage, although the decapascal is occasionally used by audiologists. The decanewton is also encountered occasionally, probably because it is an SI approximation of the kilogram-force. Its use is more common in Central Europe. In German, Polish (deka, deko), Czech, Slovak and Hungarian, deca is common (and used a word on its own always means decagram). A runway number typically indicates its heading in decadegrees.

Before the symbol as an SI prefix was standardized as "da" with the introduction of the International System of Units in 1960, various other symbols were more common, such as "dk" (f.e. in the UK and Austria), "D" (f.e. in Germany), and "Da". For syntactical reasons, the HP 48, 49, 50 series as well as the HP 39gII and Prime calculators use the unit prefix "D".

Deca (journalism collective)

Deca is a cooperative of magazine writers co-owned and managed by its members. Their cooperative model is based on photo agencies like Magnum and NOOR. Each journalist reports and writes independently but stories are edited and promoted collectively. Their writers are based all over the world, including Rome, London, Shanghai, Barcelona, Beirut, Abu Dhabi, Los Angeles, New York, Seattle, and Washington, D.C. Collectively, they have reported from more than 90 countries and every continent but Antarctica. Deca's tagline is "The world, firsthand." They offer a subscription service to their stories as well as an iOS app, with an Android app in development. Readers can also purchase the stories for download as Kindle singles on Amazon.com.

History

Deca launched in June 2014 with the story "And The City Swallowed Them" by Mara Hvistendahl and a Kickstarter campaign that raised $32,627.

And The City Swallowed Them

"And The City Swallowed Them" is Deca's debut story, written by Mara Hvistendahl, published in June, 2014. It is a true crime nonfiction story about the murder of 22-year-old model Diana O'brien in Shanghai on July 6, 2008 based on dozens of interviews with investigators, models, and both the victim's and the convicted murderer's families. The short book touches on issues of urbanization, migration and underground economies, anchored by the narrative of the lives of the Diana O'Brien and her murderer. The Wall Street Journal, China Real Time blog wrote about the book: "And The City Swallowed Them looks at the world that brought two different kinds of newcomers together—foreigners, including young models fighting for emerging opportunities in high fashion, and China’s own migrants, including those traveling from poor villages who were willing to go to desperate measures to scrape together their own living.” Hvistendahl is the author of Unnatural Selection: Choosing Boys Over Girls, and the Consequences of a World Full of Men.