Energy News  
Deep Impact: During and After Impact

Left set shows Comet July 4, and the right set July 6.
  • More images and detailed captions available here.

  • Palomar Mountain CA (SPX) Jul 25, 2005
    Astronomers using the Palomar Observatory's 200-inch Hale Telescope have been amazed by comet Tempel 1's behavior during and after its collision with the Deep Impact space probe.

    In the minutes just after the impact the comet was seen to increase its near-infrared brightness nearly fivefold. As the event progressed astronomers at Palomar were able to distinguish jets of material venting from the comet's nucleus that have persisted for days.

    Early results from the data, in images taken just minutes after impact, showed a possible plume of dust and gas extending outward some 320 km (200 miles) from the comet's center, roughly coinciding with the site of the probe's final demise.

    This apparent dust plume has persisted for several nights, allowing astronomers to watch the comet's slow rotation. The night after impact the plume was on the far side of the comet, but was visible again the next evening as the comet's rotation brought it back into view. Two days after impact, the plume was seen again, this time extending about 200 km (124 miles) from the comet's center.

    According to Bidushi Bhattacharya of the California Institute of Technology's (Caltech) Spitzer Science Center, "This could be indicative of an outburst of gas and dust still taking place near the region of the impact."

    "We are very excited by these results. It is a fabulous time to be studying comets," says James Bauer of the Jet Propulsion Laboratory (JPL). "It will be interesting to see how long the effects of the impact persist," he adds.

    The images of the comet, obtained by Bauer and Bhattacharya, were sharper than those from most ground-based telescopes because they used a technique known as adaptive optics. Adaptive optics allows astronomers to correct for the blurring of images caused by Earth's turbulent atmosphere, giving them a view that often surpasses those of smaller telescopes based in space.

    Using the adaptive-optics technique to improve an astronomer's view is generally only possible when a bright star is located near the object they want to study. On the night of impact there was no bright star close enough to the comet to use. Mitchell Troy, the adaptive-optics group lead and Palomar adaptive-optics task manager at JPL, worked with his team to make adaptive optics corrections anyway.

    "Through the dedicated efforts of the JPL and Caltech teams we were able to deploy a new sensor that was 25 times more sensitive then our normal sensor. This new sensor allowed us to correct for some of the atmosphere's distortions and significantly improve the view of the comet," says Troy. This improved view allowed astronomers to see the dust and ejected material moving out from the comet's surface immediately following the impact event and again days later.

    Earth-based observations from telescopes like the 200-inch at Palomar give astronomers an important perspective on how the comet is reacting to the impact, a perspective that cannot be achieved from the front-row seat of a fly-by spacecraft. Astronomers on the ground have the luxury of long-term observations that may continue to show changes in the comet for weeks to come.

    Collaborators on the observations include Paul Weissman (JPL), and the Palomar 200-inch crew. The Caltech-adaptive optics team is made up of Richard Dekany (team leader), Antonin Bouchez, Matthew Britton, Khanh Bui, Alan Morrissett, Hal Petrie, Viswa Velur and Bob Weber. The JPL Palomar adaptive-optics team includes Mitchell Troy (team leader), John Angione, Sidd Bikkannavar, Gary Brack, Steve Guiwits, Dean Palmer, Ben Platt, Jennifer Roberts, Chris Shelton, Fang Shi, Thang Trinh, Tuan Truong and Kent Wallace.

    Community
    Email This Article
    Comment On This Article

    Related Links
    Deep Impact at Caltech
    Astronomy at Caltech
    SpaceDaily
    Search SpaceDaily
    Subscribe To SpaceDaily Express
    Asteroid and Comet Impact Danger To Earth - News and Science



    Memory Foam Mattress Review
    Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
    XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


    A Comet's Only Cameraman
    Moffett Field CA (SPX) Aug 12, 2005
    Digital effects artist Dan Maas has a vision that " small teams... create works of spectacular scope and great complexity", a dream that he has now shown the world both on Mars and a comet.

    ---------------------------------------------------------
    New from Telescopes.com!

    It's new. And it's downright terrific!

    Celestron's CPC Schmidt-Cassegrain telescope is the scope you've been waiting for! It offers new alignment technology, advanced engineering, and bold new design at a new, low price!

    In fact, Celestron's Professional Computerized (CPC) scope with revolutionary SkyAlign Alignment Technology redefines everything that amateur astronomers are looking for. It offers quick and simple alignment, GPS technology, unsurpassed optical quality, ease of use, advanced ergonomics, enhanced computerization and, most important, affordability.

    Want to view M-31 tonight? One button takes you there!

    Shop for telescopes online at Telescopes.com! today!
    ------------------------------------------------------------







  • India To Continue Iran Pipeline Talks Despite Nuclear Energy Deal With US
  • Russia To Start Building East Siberia Pipeline In December
  • Analysis: Energy Influences EU Geo Politics
  • Geophysics Graduate Blazes New Trails For UH In Seismic Exploration

  • Analysis: India Gets Nuclear Deal
  • US Signals Flexibility Ahead Of Korean Nuclear Talks
  • Iran Talks Up Nuclear Centrifuge Work Before Suspension
  • Outside View: Deterring Tehran

  • Scientists Seek Sprite Light Source



  • Humans Trading Short-Term Food For Long-Term Environmental Losses
  • Organic Farms Use Less Energy And Water
  • EU Governments Keep National Bans On GMOs
  • Insects Resistant When Single And Double-Gene Altered Plants In Proximity

  • Eco-Friendly Motor Rally Sets Off From Kyoto To Celebrate Environment

  • Rockwell Collins Applies New NASA Software Verification Technology
  • Northrop Grumman to Help NASA Define Requirements for Quiet Sonic Boom Research Aircraft
  • Boeing and Honeywell Sign Contract for Innovative Supply-Chain Solution
  • Raytheon, Cessna Receive NASA Sonic Boom Research Grants

  • NASA plans to send new robot to Jupiter
  • Los Alamos Hopes To Lead New Era Of Nuclear Space Tranportion With Jovian Mission
  • Boeing Selects Leader for Nuclear Space Systems Program
  • Boeing-Led Team to Study Nuclear-Powered Space Systems

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement