Saturday, February 25, 2012

George E Halel Biography

George Ellery Hale was an American astronomer who pioneered in the development of instruments for studying the sun. He also planned the construction of several giant telescopes, including the Hale Reflecting Telescope at the Palomar Oberservatory near San Diego. This instrument has a diameter of 200 inches.
Hale was Born in Chicago in 1868 and graduated from the Massachusestts Insitute of Technology. in 1891, he introduced the spectroheliograph, an instrument that enables astronomers to photograph the surface of the sun with light of a single wavelength. Photographs made with a spectroheliograph reveal the distribution on the sun's surface of such elements as calcium, hydrogen, and iron. Hale also made important discoveries about sunspots. For example, he proved that these dark areas on the sun have strong magnetic fields. In 1895, Hale, along with Joseph Keeler, founded the Astrophysical Journal, which became the leading journal for astronmers. Hale founded and served as first director of the Yerkes Observatory in Wisconsin and , later, the Mount Wilson Observatory in California. Hale retried as editor of the Astrophysical Journal in 1934, and died in 1938.
Planck curves for a selection of star temperatures. Yellow stars (like sun) have T=5500 K while red stars like Antares have T=3500K.  (Courtesy Wikimedia)
A spectroheliography of the Sun at 195 angstroms, the color of iron.

Saturday, February 18, 2012

apod 3.5

 This rugged road through the dark Atacama Desert seems to lead skyward toward the bright stars and glowing nebulae of the southern Milky Way. If you follow the road you will get to Cerro Armazones peak in Chile, future construction site for the 40-meter class European Extremely Large Telescope. For now though, sliding your cursor across the image will identify wonders of the southern skies in view. The scene is dominated by the reddish glow of the Great Carina Nebula, one of our galaxy's largest star forming regions. In fact, the remarkable skyscape is not a composite of varying exposures or a photomontage. Far from sources of light pollution, the landscape illuminated by starlight and the Milky Way above were recorded by a modified digital camera and fast lens. The sensitive system captured both planet Earth and deep sky in a relatively short exposure.

Thursday, February 16, 2012

George E Hale Biography Bibliography

Tenn, Joseph. "The Bruce Medalists: George Ellery Hale." SSU Department of Physics & Astronomy - Home. Web. 4 Feb. 2012. <>.

ID1223361683. "Who Was George E Hale and What Did He Discover." The Q&A Wiki. Wiki Answers, 5 Aug. 2009. Web. 16 Feb. 2012. <>.

Osterbrock, D. E. "Founded in 1895 by George E. Hale and James E. Keeler: The Astrophysical Journal Centennial." SAO/NASA ADS: ADS Home Page. Astrophysical Journal V.438, P.1, 1995. Web. 16 Feb. 2012. <>.

"George Ellery Hale: Acknowledgement." The Franklin Institute - Home - 215.448.1200. Web. 16 Feb. 2012. <>.

"Dr. George E. Hale, Astronomer, Dead." The New York Times - Breaking News, World News & Multimedia. NyTimes. Web. 16 Feb. 2012. <>.

Sunday, February 12, 2012

observation 3

Starting my observations in the early evening, I saw venus and jupiter within 30 degrees of eachother right around sunset. I was able to see Orion, Canis Major, Taurus, the Pleiades, and Gemini in the southern Sky. In the northern sky I could see Cephius and Ursa Minor

apod 3.4

See Explanation.  Clicking on the picture will download
 the highest resolution version available.

Hubble Deep field images can peer deep into the universe, and that's exactly what its doing in this image of NGC 6752. Located 13,000 away in the southern constellation of Pavo. For a 10 billion year old cluster with hundreds of thousands of stars, it has a lot of blue stars, especially in its core. These blue stars are too young to have been formed with the rest of the cluster, so its thought that they were formed by the collision of two or more red stars, as multistar systems are extremely common in this cluster.

Friday, February 3, 2012

APOD 3.3

See Explanation.
Moving the cursor over the image will bring up an annotated version.
Clicking on the image will bring up the highest resolution version

Over the  rocky peaks in Teide National Park on Tenerife Island of the Spanish Canary Islands off the northwestern coast of Africa. The volcanic landscape  features old island summits and is sometimes used as a testbed for instruments on future Martian rovers. The light of nearbye civilization can be seen in the bottom corner of the shot. The red ring in Orion's belt is Barnards Loop. To achive this level of clarity the camera was over exposed.