Deep Impact: Excavating Comet Tempel 1

  title={Deep Impact: Excavating Comet Tempel 1},
  author={Michael F. A’Hearn and Michael J. S. Belton and W. Alan Delamere and Jochen Kissel and K. P. Klaasen and Lucy A. McFadden and Karen J. Meech and H. Jay Melosh and Peter H. Schultz and Jessica M. Sunshine and Peter C. Thomas and Joseph Frank Veverka and David Yeomans and Michael W. Baca and Ivo Busko and Christopher J. Crockett and Steven M. Collins and Mark Desnoyer and Clara A. Eberhardy and Carolyn M. Ernst and Tony L. Farnham and Lori M. Feaga and O. Groussin and Donald L. Hampton and Sergei I. Ipatov and J.‐Y. Li and D. J. Lindler and Carey M. Lisse and Nickolaos Mastrodemos and W. M. Owen and James E. Richardson and Dennis Wellnitz and R. White},
  pages={258 - 264}
Deep Impact collided with comet Tempel 1, excavating a crater controlled by gravity. The comet's outer layer is composed of 1- to 100-micrometer fine particles with negligible strength (<65 pascals). Local gravitational field and average nucleus density (600 kilograms per cubic meter) are estimated from ejecta fallback. Initial ejecta were hot (>1000 kelvins). A large increase in organic material occurred during and after the event, with smaller changes in carbon dioxide relative to water. On… 

Location of upper borders of cavities containing dust and gas under pressure in comets

The distance between the pre-impact surface of Comet 9P/Tempel 1 and the upper border of the largest cavity excavated during the ejection of material after the collision of the impact module of the

Tempel 1: Surface Processes and the Origin of Smooth Terrains

Introduction: On 4 July 2005 NASA’s Deep Impact spacecraft [1] obtained high resolution views (better than 10m/pxl) of some 30% of the surface of comet 9P/Tempel 1. The images reveal the nucleus to

The Thickness and Formation Age of the Surface Layer on Comet 9P/Tempel 1

Cometary nuclei are believed to contain important information on the condition of the solar nebula, but there is little observational data available on their interior structure. Our ground-based

The Deep Impact crater on 9P/Tempel-1 from Stardust-NExT

Subaru Telescope Observations of Deep Impact

Mid-infrared data from the Cooled Mid-Infrared Camera and Spectrometer (COMICS) of the Subaru Telescope indicate that the large-scale dust plume ejected by the impact contained a large mass and formed two wings approximately ±45° from the symmetric center, both consistent with gravity as the primary control on the impact and its immediate aftermath.



Deep Impact: excavating comet 9P/Tempel 1

  • M. A’Hearn
  • Physics, Geology
    Proceedings of the International Astronomical Union
  • 2005
The Deep Impact mission delivered 19 gigajoules of kinetic energy to the nucleus of comet 9P/Tempel 1 on 4 July 2005. Intensive observations, both from the two spacecraft and from Earth and

Expectations for Crater Size and Photometric Evolution from the Deep Impact Collision

The NASA Discovery Deep Impact mission involves a unique experiment designed to excavate pristine materials from below the surface of comet. In July 2005, the Deep Impact (DI) spacecraft, will

Impact Cratering: A Geologic Process

The mechanisms involved in the formation of impact craters are examined theoretically, reviewing the results of recent investigations. Topics addressed include crater morphology, stress waves in

Exposed Water Ice Deposits on the Surface of Comet 9P/Tempel 1

The direct detection of solid water ice deposits exposed on the surface of comet 9P/Tempel 1, as observed by the Deep Impact mission, suggests that the surface deposits are loose aggregates.

Compaction as the origin of the unusual craters on the asteroid Mathilde

The asteroid Mathilde has suffered at least five giant impacts. Previous studies suggest that Mathilde's giant craters should be surrounded by blankets of ejecta that are kilometres deep, yet the

Deep Impact: Observations from a Worldwide Earth-Based Campaign

Data show that there was new material after impact that was compositionally different from that seen before impact, and the ratio of dust mass to gas mass in the ejecta was much larger than before impact.

Deep Impact: A Large-Scale Active Experiment on a Cometary Nucleus

The Deep Impact mission will provide the first data on the interior of a cometary nucleus and a comparison of those data with data on the surface. Two spacecraft, an impactor and a flyby spacecraft,

Impact Cratering Theory and Modeling for the Deep Impact Mission: From Mission Planning to Data Analysis

The cratering event produced by the Deep Impact mission is a unique experimental opportunity, beyond the capability of Earth-based laboratories with regard to the impacting energy, target material,