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To obtain the new views, researchers paired the 230-foot (70-meter) Deep Space
Network antenna at Goldstone, California, with two other radio telescopes, one at a time. Using this technique, the Goldstone antenna beams a radar signal at an asteroid and the other antenna receives the reflections. The
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At its closest approach to Earth on June 8, the asteroid came within 776,000 miles (1.25 million kilometers), or slightly more than three times the distance to the moon. Scientists began radar observations of 2014 HQ124 shortly after the closest approach, when the asteroid was between about 864,000
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The asteroid is about 1,300 feet (400 meters) long and about half as wide. The radar images reveal a wealth of interesting features, including a large depression or concavity on the larger lobe as well as two blocky, sharp-edged features at the bottom on the radar echo. Scientists suspect that some
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The first five images in the sequence -- the top row in the montage -- represent the data collected by
Arecibo, and demonstrate that these data are 30 times brighter than what Goldstone can produce observing on its own. There is a gap of about 35 minutes between the first and second rows in the
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For asteroids, as well as comets, radar is a powerful tool for studying the objects' size, shape, rotation, surface features and orbits. Radar measurements of asteroid distances and velocities enable researchers to compute orbits much further into the future than if radar observations were not
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To image 2014 HQ124, the researchers first paired the large
Goldstone antenna with the 1000-foot (305-meter) Arecibo radio telescope in Puerto Rico. They later paired the large Goldstone dish with a smaller companion, a 112-foot (34-meter) antenna, located about 20 miles (32 kilometers) away.
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The new views show features as small as about 12 feet (3.75 meters) wide. This is the highest resolution currently possible using scientific radar antennas to produce images. Such sharp views were made possible for this asteroid by linking together two giant radio telescopes to enhance their
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2014 HQ124 is what scientists call a "contact binary": an asteroid that consists of two lobes that are in contact and that could have once been separate objects. About one in six asteroids in the near-Earth population has this type of elongated, "peanut" shape.
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The Jet
Propulsion Laboratory manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena.
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The 21 radar images were taken over a span of four hours. During that interval, the asteroid rotated a few degrees per frame, suggesting its rotation period is slightly less than 24 hours.
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montage, or between the fifth and sixth frames in the video. The gap represents the time needed to switch from receiving at
Arecibo to receiving at the smaller Goldstone station.
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Each image in the montage and movie represents 10 minutes of data. Each frame has the same orientation, delay-Doppler dimensions and resolution (3.75 meters by 0.0125 Hertz).
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NASA scientists used Earth-based radar to produce these sharp views -- an image montage and a movie sequence -- of the asteroid designated "2014 HQ124" on June 8, 2014.
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joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use.
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miles (1.39 million kilometers) and 902,000 miles (1.45 million kilometers) from Earth.
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technique dramatically improves the amount of detail that can be seen in radar images.
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of the bright features that persist from frame to frame could be surface boulders.
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More information about asteroids and near-Earth objects is available at
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Click on a date/time to view the file as it appeared at that time.
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data may be copyrighted if they are not explicitly produced by the
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http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA18412
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in the United States because it was solely created by
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Commons is a freely licensed media file repository.
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work of the federal government of the United States
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164:=> VIDEO
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22:File history
352:14 CFR 1221
205:available.
128:Description
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732:2014 HQ124
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702:2014 HQ124
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659:2014 HQ124
650:File usage
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559:inception
383:See also
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252:Licensing
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639:Drbogdan
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