Featured Research

from universities, journals, and other organizations

Dramatic, Close-Up Radar Images Of Asteroids To Be Shown At International Space Conference At Cornell

Date:
July 22, 1999
Source:
Cornell University
Summary:
Dramatic new close-up radar images of asteroids obtained by the Arecibo 305-meter radio/radar telescope in Puerto Rico will be shown by Steven Ostro of NASA's Jet Propulsion Laboratory (JPL) at the seventh International Asteroids, Comets and Meteors Conference (ACM) at Cornell University July 26-30. Ostro also will report on an asteroid, the size of a baseball diamond, that is the smallest solar system object ever studied in detail.

ITHACA, N.Y. -- Dramatic new close-up radar images of asteroids obtained by the Arecibo 305-meter radio/radar telescope in Puerto Rico will be shown by Steven Ostro of NASA's Jet Propulsion Laboratory (JPL) at the seventh International Asteroids, Comets and Meteors Conference (ACM) at Cornell University July 26-30. Ostro also will report on an asteroid, the size of a baseball diamond, that is the smallest solar system object ever studied in detail.

Ostro will describe the increasingly important use of radar for imaging when he moderates one of the daily press conferences (Monday, July 26, 10 a.m., 305 Ives Hall) during the ACM. Ostro will describe how radar is being used to construct geologically detailed three-dimensional models of distant bodies, including 37 main-belt asteroids and 50 near-Earth asteroids.

High-resolution imaging has been obtained for a number of near-Earth objects (NEOs) with the most impressive results being obtained for asteroid 1998 KY26, asteroid Toutatis and Asteroid 1992 SK.

Donald Campbell, professor of astronomy at Cornell, and Ostro also will describe plans for the use of the Very Long Baseline Array (VLBA), in conjunction with Arecibo Observatory and JPL/Goldstone radars, to image near-Earth asteroids and comets. The VLBA will be able, for the first time, to obtain images with resolutions of about 100 meters.

Earth-based radars are powerful tools for the investigation of asteroids and comets. The radar systems on the recently upgraded Arecibo telescope, operated by Cornell for the National Science Foundation, and the NASA/Deep Space Network 70-meter Goldstone antenna in California have the capacity to image Earth-approaching asteroids or comets with resolutions as small as 15 meters (50 feet) and to provide measurements of their distance and velocity, allowing their future orbits to be very accurately predicted. Measurements of radar reflection properties provide information about asteroids' surface bulk density, surface roughness and rotation state.

Radar is also one of the few means to investigate cometary nuclei directly. Seven have been detected to date by the Arecibo and Goldstone telescopes. Given the recent improvements in Arecibo's sensitivity, researchers are awaiting the next close approach of a comet to the Earth to obtain high-resolution radar images of its nucleus using a powerful tool called delay-Doppler radar mapping.

Ten short-period comets are candidates for detection with radar during the next two decades, but it also is anticipated that several as yet undiscovered comets will be observed passing through the solar system.

In recent years there has been an increase in the number of active meteor radar studies ranging in sophistication from systems that use existing commercial television broadcasts to special multifrequency transmissions. High-power, low-frequency radar studies of meteor trails forming in the Earth's atmosphere have been carried out for many years at the AMOR radar in the Southern Hemisphere, but recently several studies incorporating the powerful UHF radars at Arecibo and the European Incoherent Scatter facility have routinely shown the behavior of the dense electron clouds, known as head echoes, that occur around even tiny high-speed particles, called micrometeors.

While many of these and other facilities have been used to study the famous Leonid shower, much progress is being made on the nonuniform structure of other meteoroid streams. The first inference of the masses and sizes of micrometeors using observations of deceleration using the Arecibo radar and the detection of extremely high velocity, and therefore apparently interstellar, micrometeors using the AMOR and Arecibo radars represent two of the more unusual radar meteor topics being discussed at ACM.

A full schedule of the press conferences is available on the ACM media web site at http://www.news.cornell.edu/releases/July99/ACM/. The conference web site is at http://scorpio.tn.cornell.edu/ACM/.


Story Source:

The above story is based on materials provided by Cornell University. Note: Materials may be edited for content and length.


Cite This Page:

Cornell University. "Dramatic, Close-Up Radar Images Of Asteroids To Be Shown At International Space Conference At Cornell." ScienceDaily. ScienceDaily, 22 July 1999. <www.sciencedaily.com/releases/1999/07/990722065200.htm>.
Cornell University. (1999, July 22). Dramatic, Close-Up Radar Images Of Asteroids To Be Shown At International Space Conference At Cornell. ScienceDaily. Retrieved August 22, 2014 from www.sciencedaily.com/releases/1999/07/990722065200.htm
Cornell University. "Dramatic, Close-Up Radar Images Of Asteroids To Be Shown At International Space Conference At Cornell." ScienceDaily. www.sciencedaily.com/releases/1999/07/990722065200.htm (accessed August 22, 2014).

Share This




More Space & Time News

Friday, August 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Space to Ground: Hello Georges

Space to Ground: Hello Georges

NASA (Aug. 18, 2014) Europe's ATV-5 delivers new science and the crew tests smart SPHERES. Questions or comments? Use #spacetoground to talk to us. Video provided by NASA
Powered by NewsLook.com
Tiny Satellites, Like The One Tossed From ISS, On The Rise

Tiny Satellites, Like The One Tossed From ISS, On The Rise

Newsy (Aug. 18, 2014) The Chasqui I, hand-delivered into orbit by a Russian cosmonaut, is one of hundreds of small satellites set to go up in the next few years. Video provided by Newsy
Powered by NewsLook.com
This Week @ NASA, August 15, 2014

This Week @ NASA, August 15, 2014

NASA (Aug. 15, 2014) Carbon Observatory’s First Data, ATV-5 Delivers Cargo, Cygnus Departs Station and more... Video provided by NASA
Powered by NewsLook.com
Space Shuttle Replica Hoisted for Landmark Exhibit

Space Shuttle Replica Hoisted for Landmark Exhibit

Reuters - US Online Video (Aug. 14, 2014) The space shuttle replica Independence has been hoisted atop Space Center Houston's shuttle carrier aircraft, creating a monument to the shuttle program which will open to the public next year. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins