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asteroid : any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter — Webster
Asteroids are a class of Small Solar System Bodies in orbit around the Sun. They have also been called planetoids, especially the larger ones. These terms have historically been applied to any astronomical object orbiting the Sun that did not show the disk of a planet and was not observed to have the characteristics of an active comet, but as small objects in the outer Solar System were discovered, their volatile-based surfaces were found to more closely resemble comets, and so were often distinguished from traditional asteroids. Thus the term asteroid has come increasingly to refer specifically to the small rocky–icy and metallic bodies of the inner Solar System out to the orbit of Jupiter. They are grouped with the outer bodies—centaurs, Neptune trojans, and trans-Neptunian objects—as minor planets, which is the term preferred in astronomical circles.
There are millions of asteroids, many thought to be the often shattered remnants of planetesimals, bodies within the young Sun’s solar nebula that never grew large enough to become planets. A large majority of known asteroids orbit in the asteroid belt between the orbits of Mars and Jupiter or co-orbital with Jupiter (the Jupiter Trojans). However, other orbital families exist with significant populations, including the near-Earth asteroids. Individual asteroids are classified by their characteristic spectra, with the majority falling into three main groups: C-type, S-type, and M-type. These were named after and are generally identified with carbon-rich, stony, and metallic compositions, respectively. — Wikipedia
Near-Earth Objects (Minor Planet Center, International Astronomical Union)
Near Earth Asteroids (Minor Planet Center, International Astronomical Union)
Potentially Hazardous Asteroids (Minor Planet Center, International Astronomical Union)
1+ KM Near-Earth Objects (Minor Planet Center, International Astronomical Union)
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
- Consistent asteroid showers rock previous...on January 21, 2022 at 2:35 pm
New Curtin University research has confirmed the frequency of asteroid collisions that formed impact craters on Mars has been consistent over the past 600 million years.
- NASA solar sail mission to chase tiny asteroid...on January 20, 2022 at 9:27 pm
Launching with the Artemis I uncrewed test flight, NASA's shoebox-size Near-Earth Asteroid Scout will chase down what will become the smallest asteroid ever to be visited by a spacecraft. It will get there by unfurling a solar sail to harness solar radiation for propulsion, making this the agency's first deep space mission of its kind.
- Looking up at the asteroids in the neighborhoodon January 19, 2022 at 2:08 pm
Asteroids fly through our solar system all the time, but it's rare for us to take notice of them. But that's changed this week, as an asteroid passes within 1,231,184 miles of Earth on January 18. The asteroid, dubbed 7482 (1994 PC1), was first seen in 1994 and is about two-thirds of a mile wide.
- Designing a science program for sky-monitoring...on January 18, 2022 at 5:45 pm
The SETI Institute teamed up with Louisiana State University (LSU) and Mississippi State University (MSU) to help students design the science program for AstronetX PBC's first lunar-based camera (L-CAM 1). The scientific program planning is funded by a Gordon and Betty Moore Foundation grant to AstronetX. Additional funding for student participation is provided by the National Science Foundation (NSF) Research Experiences for Undergrads (REU) program at LSU.
- Look up and watch asteroid 1994 PC1 fly past...on January 18, 2022 at 12:19 pm
In a slow moving universe, asteroids give us a rare chance to see things moving in real time. We have such a chance coming right up on the evening of Tuesday, January 18, when 1.1-kilometer asteroid (7482) 1994 PC1 passes 1.23 million miles (1.98 million kilometers) from the Earth. This is about five times the distance from the Earth to the moon, and just a shade over the distance to the anti-sunward Earth-sun Lagrange 2 point, soon to be the home of the James Webb Space Telescope.
- Palomar survey instrument analyzes impact of...on January 17, 2022 at 5:57 pm
Since 2019, SpaceX has been launching an increasing number of internet satellites into orbit around Earth. The satellite constellation, called Starlink, now includes nearly 1,800 members orbiting at altitudes of about 550 kilometers. Astronomers have expressed concerns that that these objects, which can appear as streaks in telescope images, could hamper their scientific observations.
- E.T.s may be headed toward Earth, but are we...on January 11, 2022 at 2:23 pm
Twenty years from now we might get a call from aliens. In 2017, a powerful radio transmission was aimed at exoplanet GJ 273b, thought to be able to support life. Its message, sent by the alien-hunting group Messaging Extraterrestrial Intelligence International, contained instructions on how to understand Earthling math, music and time. If it lands on intelligent alien ears once it arrives in about a decade, E.T. now has our number.
- 'Don't Look Up': Real-world scientists comment on...on January 10, 2022 at 2:32 pm
In the new Netflix movie "Don't Look Up," two actors playing fictional Michigan State University astronomers discover a comet on a collision course with Earth and struggle to convince people to take them seriously. The film is a satire about society's inability to cope with climate change.
- Several asteroids are heading towards Earth: How...on January 7, 2022 at 2:10 pm
Don't look now—but we are currently experiencing a rash of stories about a forthcoming global catastrophe. But in a change from reports of pandemics and climate change, this global catastrophe is produced by the impact of a giant asteroid. Or comet. Or both. This may feel extra ominous given the events in the recent Netflix film "Don't Look Up", in which the Earth is threatened by a "planet killer" asteroid.
- Asteroids, the moon and Mars: Space missions to...on January 6, 2022 at 2:07 pm
Astronomers ended 2021 on a high with the launch on December 25 of the James Webb Space Telescope, a joint mission between the European Space Agency, Nasa and the Canadian Space Agency. It was a relief to hear that the precision drives that opened up the complex sunshield, which is about the size of a tennis court, worked perfectly.
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Here are links to pages about closely related subjects.
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid