New research using the world’s largest telescope at the Keck Observatory in Hawaii has revealed two distinct populations of star clusters surrounding galaxies that have radically different chemical compositions.
M22 or NGC6656 in Sagittarius, a classic globular clusterAn international team, led by Swinburne astronomers Christopher Usher and Professor Duncan Forbes, has measured the chemical composition of more than 900 star clusters in a dozen galaxies.
“This is ten times the number of star clusters previously examined, allowing us to confirm the existence of two chemically-distinct star clusters,” Mr Usher said.
Posted below is Dean’s latest time-lapse video of the LBT opening for a night of observing. I suspect he will be posting something similar of Keck in the near future. We toured the telescopes today and he had a chance to setup the camera while the guys swung the ‘scope around a bit.
I have visited the LBT, many years ago before it was completed. Even without the dual 8.4 meter primary mirrors it was an impressive facility.
Today Mercury reaches maximum elongation, the furthest point it will reach from the Sun in the sky and the highest it will be above the sunset this apparition. The planet is easily visible as a bright, starlike object about 15° above the setting Sun as the sky grows dark. Over the next couple weeks Mercury will slide back into the sunset, heading for inferior conjunction on November 17th.
Dr. Ben Zuckerman
University of California at Los Angeles Violent Events in Rocky Planetary Systems: Implications for the fate of technological civilizations
Looking into the optics of the Keck 2 telescopeThursday, October 25, 2012
7:00 PM
Gates Performing Arts Center Auditorium
Hawaii Preparatory Academy
65-1692 Kohala Mtn. Rd., Waimea
This evening, Dr. Ben Zuckerman of UCLA, will take us on a journey describing Earth’s formation 4.6 billion years ago to its possible demise 4-5 billion years from now. Along the way, we will consider a few tumultuous eras suffered by Earth’s biosphere, including the present. Such eras, from origins to final resting places, can be explored by understanding astronomical studies of other planetary systems. These systems also provide clues for the long-term fate of our technological civilization and the likelihood, or lack thereof, of civilizations beyond our own.
Seating is limited to first come, first served.
Doors Open at 6:30 PM
Free and Open to the Public
One of the dividends of an Alaskan cruise is the fish we brought back. Processed, vacuum packed and frozen while on the boat, the fish was packed into a cooler and checked for the flight back to Hawai’i. It is a bit nerve-wracking, waiting for the cooler to appear on the baggage carousel in Kona. Appear it did, all of the contents still frozen solid as we loaded it into the freezer at home.
Thirty five pounds of coho salmon, halibut and picked dungeness crab. Light on the salmon, I gave much of it to my brother. Heavy on the halibut, on orders from my wife. We did well on crab, I pulled up full traps several times and we picked crab for hours on the back deck as we cruised along. Pick half a crab… eat a leg! It was a tasty way to go.
Last week I noted the market had frozen wild-caught dungeness crab, at $26 a pound. Halibut was a bit more expensive at Costco. Figure there was about $900 worth of seafood in that cooler. We will be eating well…
Pan seared halibut in garlic, onion and pepper, over brown rice.
A joint effort of citizen scientists and professional astronomers at W.M. Keck Observatory in Hawaii has led to the first reported case of a Tatooine-like planet orbiting twin suns that in turn is orbited by a second distant pair of stars.
Aided by volunteers using the Planethunters.org website, a Yale-led international team of astronomers using Keck’s 10-meter telescope identified and confirmed discovery of the phenomenon, called a circumbinary planet in a four-star system.
Only six planets are known to orbit two stars, according to researchers, and none of these are orbited by distant stellar companions.
“Circumbinary planets are the extremes of planet formation,” said Meg Schwamb of Yale, lead author of a paper about the system presented Oct. 15 at the annual meeting of the Division for Planetary Sciences of the American Astronomical Society in Reno, Nevada. “The discovery of these systems is forcing us to go back to the drawing board to understand how such planets can assemble and evolve in these dynamically challenging environments.”
An artist’s illustration of PH1, a planet discovered by volunteers from the Planet Hunters citizen science project. PH1, shown in the foreground, is a circumbinary planet and orbits two suns. Credit: Haven Giguere/Yale
Dubbed PH1, the planet was first identified by citizen scientists participating in Planet Hunters, a Yale-led program that enlists the public to review astronomical data from NASA’s Kepler spacecraft for signs of planets. It is the project’s first confirmed planet.
The volunteers, Kian Jek of San Francisco and Robert Gagliano of Cottonwood, Arizona, spotted faint dips in light caused by the planet as it passed in front of its parent stars, a common method of finding extrasolar planets. Schwamb, a Yale postdoctoral researcher, led the team of professional astronomers that confirmed the discovery and characterized the planet, following observations from the Keck telescopes on Mauna Kea, Hawaii. PH1 is a gas giant with a radius about 6.2 times that of Earth, making it a bit bigger than Neptune.
“Planet Hunters is a symbiotic project, pairing the discovery power of the people with follow-up by a team of astronomers,” said Debra Fischer, a professor of astronomy at Yale and planet expert who helped launch Planet Hunters in 2010. “This unique system might have been entirely missed if not for the sharp eyes of the public.”
PH1 orbits outside the 20-day orbit of a pair of eclipsing stars that are 1.5 and 0.41 times the mass of the Sun. It revolves around its host stars roughly every 138 days. Beyond the planet’s orbit at about 1000 AU (roughly 1000 times the distance between Earth and the Sun) is a second pair of stars orbiting the planetary system.
Some great videos are circulating through the Hawaiian blogs… It seems that someone toured the islands back in the 1940’s and took a few reels of 16mm film. These vintage films turned up at a garage sale and were rescued by Tim Peddy and Rick Helin, who understood their value. With the assistance of the California Pioneers of Santa Clara County and a special telecine converter the film was transferred to a digital format.
Watching the films is a great look into life on the islands six decades ago. Photos of places familiar and yet removed in time.
Saddle road seems familiar, it has gotten a bit better. The scenes of paniolos driving cattle into the surf to to be towed to a waiting freighter are simply fantastic!
In the second clip I see some footage that was clearly not taken on the Big Island, probably windward Oahu judging by the cliffs in the background.
The film of the Inter-Island Airways (now Hawaiian Airlines) Sikorsky S-43 flying boat is great. There are also great aerial shots of the Hamakua Coast showing and seemingly endless expanse of sugar cane fields and plantation towns.
