The vernal or spring equinox occurs today at 01:02HST. Today there will be little difference between the length of the night when counted against the number of daylight hours. This is the first day of spring as marked by many cultures in the northern hemisphere.
The weather finally broke, leaving a clear western sky and a chance to photograph the comet. I set up and managed just a few shots before the comet set into the top of a tree across the street.
At least I was able to get on-sky. Much more than can be said about our ‘scopes on the mountain. Observing was cancelled earlier this afternoon, there is too much ice on the domes to operate safely. At least the ice was pretty, and photogenic.
Comet C/2011 L4 Pan-STARRS over the Hawai’i, AT6RC and Canon 60D
This evening will see the Moon and Jupiter quite close, about 2° apart at sunset. Look for the bright pair high in the western sky as the sky grows dark. The Moon will be about 36% illuminated and Jupiter will be quite bright at -2.2 magnitude.
Date: Sunday, March 17 Showtime: 7:00 pm, Free and Open to the Public Location: Kahilu Theatre
Join us for a wonderful screening of this classic film hosted by Artist Jon Lomberg who will share about how he and Carl Sagan collaborated for 25 years on projects including COSMOS, the Voyager Golden Record, and the film Conact, in production at the time of Sagan’s death in 1996. Lomberg is also developer of the Big Island’s Galaxy Garden.
Beer and wine available for sale at event. Not just any beer either, but Big Island Brewhaus brews!
Contact starring Jodie Foster and Matthew McConaughey
A team of international scientists using the W. M. Keck Observatory has made the most detailed examination yet of the atmosphere of a Jupiter-size planet beyond our Solar System.
According to lead author Quinn Konopacky, an astronomer with the Dunlap Institute for Astronomy & Astrophysics, University of Toronto and a former Lawrence Livermore National Laboratory (LLNL) postdoc, “We have been able to observe this planet in unprecedented detail because of Keck Observatory’s advanced instrumentation, our ground-breaking observing and data processing techniques, and because of the nature of the planetary system.” The paper appears online March 14th in Science Express, and March 22nd in the journal Science.
“This is the sharpest spectrum ever obtained of an extrasolar planet,” said co-author Bruce Macintosh, an astronomer at LLNL. “This shows the power of directly imaging a planetary system—the exquisite resolution afforded by these new observations has allowed us to really begin to probe planet formation.”
Artist’s rendering of the planetary system HR 8799 at an early stage in its evolution. Credit: Dunlap Institute for Astronomy & Astrophysics
The team, using the OSIRIS instrument fitted on the mighty Keck II telescope on the summit of Mauna Kea, Hawaii, has uncovered the chemical fingerprints of specific molecules, revealing a cloudy atmosphere containing water vapor and carbon monoxide. “With this level of detail,” says coauthor Travis Barman, an astronomer at the Lowell Observatory, “we can compare the amount of carbon to the amount of oxygen present in the atmosphere, and this chemical mix provides clues as to how the planetary system formed.”
There has been uncertainty about how planets in other solar systems formed, with two leading models, called core accretion and gravitational instability. When stars form, they are surrounded by a planet-forming disk. In the first scenario, planets form gradually as solid cores slowly grow big enough to start absorbing gas from the disk. In the latter, planets form almost instantly as parts of the disk collapse on themselves. Planetary properties, like the composition of a planet’s atmosphere, are clues as to whether a system formed according to one model or the other.
