Related Experiment Video
Updated: Jul 16, 2026
10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
Subaru telescope observations of Deep Impact
S Sugita1, T Ootsubo, T Kadono
1Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba, Japan. sugita@k.u-tokyo.ac.jp
Science (New York, N.Y.)
|September 17, 2005
Summary
Comet impact cratering is complex. Subaru Telescope data reveals gravity controlled the large dust plume, but volatile expansion also accelerated inner plume dust.
Area of Science:
- Cometary science
- Impact physics
- Planetary geology
Background:
- Understanding comet impact cratering is crucial for interpreting data from missions like Deep Impact.
- The collision of the Deep Impact probe with comet 9P/Tempel 1 provides a unique case study.
Purpose of the Study:
- To analyze the dust plume dynamics following the Deep Impact collision with comet 9P/Tempel 1.
- To determine the primary forces controlling the ejected dust distribution.
Main Methods:
- Utilized mid-infrared data from the Cooled Mid-Infrared Camera and Spectrometer (COMICS) aboard the Subaru Telescope.
- Analyzed the large-scale dust plume structure and distribution.
Main Results:
- The study identified a large mass (approx. 10^6 kg) of dust in the plume.
- The plume exhibited two wings extending approximately +/-45 degrees, consistent with gravitational control.
- The inner plume's dust distribution indicated additional acceleration due to volatile evaporation and expansion.
Conclusions:
- Gravity was the primary force governing the overall structure of the impact plume.
- Volatile processes played a significant role in accelerating dust within the inner regions of the plume.
- These findings refine models of cometary impact dynamics.
Related Concept Videos
01:27Gravity between Spherical Bodies
Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
01:26Impact: Problem Solving
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
01:15Depth Perception and Spatial Vision
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...