Archive

Posts Tagged ‘Hartley’

Hyperactive Comet Hartley 2 Has a Split History

October 6, 2011 Leave a comment

The latest analysis of data from NASA’s Deep Impact spacecraft shows that comet 103P/Hartley 2 is hyperactive in terms of the material it spews out, compared to the other comets observed up close to date.  The comet also shows surprising diversity – ice on the comet’s sunlit surface is found in patches that are isolated from areas of dust. In addition, one lobe of the dog-bone shaped comet may have lost much more of the primordial material from the formation of the comet than the other, suggesting that Hartley 2 was originally two comets that came together in a gentle collision. Mike A’Hearn and Lori Feaga will be presenting their findings at the EPSC-DPS Joint Meeting 2011 in Nantes, France.

Deep Impact made its closest encounter of Hartley 2 on 4 November 2010. Over the past year, the science team has been pouring over the data to gain a more detailed understanding of the processes that drive the comet’s activity.

“Hartley 2 works differently from Tempel 1, which was encountered by Deep Impact in 2005 and from Wild 2, which was observed by the Stardust mission.  It ejects a huge amount of material for its size. Halley, which was observed by the Giotto mission lies somewhere in the middle of the spectrum of activity. Since the encounter, we have been able to dig deeper into the data and have provided more evidence of how ice and dust is released from the nucleus,” said A’Hearn, the Principal Investigator of Deep Impact’s mission extension, EPOXI.

Full Story: http://www.europlanet-eu.org/outreach/index.php?option=com_content&task=view&id=355&Itemid=41

Advertisements