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Fabián Di Tullio
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La mejor imagen de la superficie y la atmósfera de una estrella

A simple vista, la famosa y brillante estrella Antares refulge en fuertes tonos rojo en el corazón de la constelación de Escorpio (el escorpión). Es una enorme estrella supergigante roja, relativamente fría y en las últimas etapas de su vida, camino de convertirse en una supernova.

Ahora, un equipo de astrónomos, dirigido por Keiichi Ohnaka, de la Universidad Católica del Norte (Chile), ha utilizado el VLTI (el interferómetro del VLT, Very Large Telescope de ESO), instalado en el Observatorio Paranal, en Chile, para mapear la superficie de Antares y medir los movimientos del material superficial. Es (sin contar a nuestro Sol) la mejor imagen de la superficie y la atmósfera de una estrella que se haya obtenido hasta ahora. También han realizado el primer mapa de las velocidades del material en la atmósfera de una estrella que no es el Sol, revelando inesperadas turbulencias en la enorme y extendida atmósfera de Antares. Los resultados se publican en la revista Nature.

Fuente: ESO

#Antares #supernova #estrella

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The WSPR 40-meter shortwave 10-watt signal reception during and after the #Eclipse for #Eclipse2017 - The station transmitting in the very center is +NW7US​, located in Omaha, Nebraska. You can see that during the eclipse, the ionosphere was favorable for propagation of radio waves in the 7 MHz spectrum. After the eclipse, the ionosphere changed back to typical daytime propagation in which we see limited 40-meter propagation.

#hamr #astronomy #ARRL #SARA #sun #hamradio

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RECORDATORIO OLIMPIADA ARGENTINA DE ASTRONOMIA 2017

Fecha límite para la INSCRIPCIÓN (ambas modalidades) Viernes 25 de Agosto de 2017

EVALUACIONES: Primera evaluación (Examen de preselección): Lunes 11 de Septiembre de 2017
Segunda evaluación (Examen Final): Jueves 9 de Noviembre de 2017
ESCUELAS DE MODALIDAD ESPECIAL: Fecha límite para la presentación de trabajos Viernes 29 de Septiembre de 2017

Para consultas dirigirse a Comisión Organizadora de la OAA
Correo Electrónico: olimpiadaaa@oac.unc.edu.ar
Página web: http://www.olimpiadas.oac.uncor.edu
Facebook: https://www.facebook.com/olimpiadaargentinadeastronomia?fref=ts

Dr. Martín Leiva, mleiva@unc.edu.ar - (0351) 433-1064-int 109
Dra. Mónica Oddone, mao@oac.uncor.edu - (0351) 433-1064-int 122
Geof. Luis O. Gómez, extension@observatorio.unlp.edu.ar - (0221) 423-6593-int 141
Dr. Geof. Andres Cesanelli, extension@observatorio.unlp.edu.ar - (0221) 423-6593-int 141

Observatorio Astronómico de Córdoba, UNC
Sitio web: http://oac.unc.edu.ar
Dirección: Laprida 854, B. Observatorio (5000), Córdoba, Argentina.

Facultad de Ciencias Astronómicas y Geofísicas, UNLP
Sitio web: http://www.fcaglp.unlp.edu.ar
Dirección: Paseo del Bosque s/n - C.P.: B1900FWA, La Plata, Buenos Aires, Argentina.
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Another Hot July

July 2017 was statistically tied with July 2016 as the warmest July in the 137 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA’s Goddard Institute for Space Studies (GISS).

Last month was about 0.83 degrees Celsius warmer than the mean July temperature of the 1951-1980 period. Only July 2016 showed a similarly high temperature (0.82 degrees Celsius). All previous months of July were more than a tenth of a degree cooler.

This animation shows global temperature anomalies for every month since 1880, a result of the Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2) model run by NASA’s Global Modeling and Assimilation Office. Each line shows how much the global monthly temperature was above or below the annual global mean from 1980–2015. Note how monthly temperature anomalies rise over the 137-year record. The long-term warming trend has been driven by rising concentrations of heat-trapping carbon dioxide and other greenhouse gases in the atmosphere.

July 2017 was about 0.83 degrees Celsius warmer than the mean July from the 1951–1980 period. July 2016 showed a similarly high temperature (0.82°C). The three previous global highs were set in 2015, 2011, and 2009.

The GISS team assembles its temperature analysis from publicly available data acquired by roughly 6,300 meteorological stations around the world; by ship- and buoy-based instruments measuring sea surface temperature; and by Antarctic research stations. This raw data is analyzed using methods that account for the varied spacing of temperature stations around the globe and for urban heating effects that could skew the calculations. There are sufficient observations from 1880 (particularly in the southern hemisphere) to produce a reasonably precise global temperature record. Prior to that, uncertainties (due to gaps in spatial coverage) increase substantially.

Meteorologists writing for The Washington Post recently reported that the average July 2017 temperature in Death Valley, California, was the hottest for any location on record on Earth. The average temperature was 107.4 degrees Fahrenheit (41.9°C), as the temperature (day or night) never dropped below 89°F degrees and ranged as high as 127°F.

Several other U.S. locations, including Salt Lake City, Miami, and Reno, set new monthly temperature records in July. Spain also posted its highest daily temperature on record when temperatures soared to 46.9°C (116.4°F) in Cordoba. And Shanghai, China, registered its highest-ever daily temperature at 40.9°C (105.6°F) in late July.

https://go.nasa.gov/2v2Lekl

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La pirámide alimenticia del "vero napolitano"
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