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Bennu is an active asteroid
Discovered‎: ‎Sept. 11, 1999

Bennu is an active asteroid

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Bennu is an active asteroid, emitting plumes of dust. This was not unexpected, but the fruit of multi-mode, multidecadal searching. Before the arrival of OSIRIS-REx  https://youtu.be/NYGHbl_esgw

  Bennu had displayed polarization consistent with Comet Hale-Bopp and 3200 Phaethon, a rock comet.

Member of asteroid group: Apollo asteroid
Discovery organization:
Lincoln Near-Earth Ast... Star system: Solar System
Orbits: Sun
101955 Bennu is a carbonaceous asteroid in the Apollo group discovered by the LINEAR Project on 11 September 1999. It is a potentially hazardous object that is listed on the Sentry Risk Table with the second-highest cumulative rating on the Palermo Technical Impact Hazard Scale. Wikipedia
Radius: 861.22′

10 Ways OSIRIS-REx is Advancing the Asteroid Frontier

OSIRIS-REx, NASA’s first mission to sample an asteroid, is on a seven-year journey to collect remnants of the early solar system. When the minivan-sized spacecraft arrived at its destination – an ancient near-Earth asteroid called Bennu – in December 2018, it beamed back images of a tiny world that had never before been seen up close. By Christine Hoekeng

https://solarsystem.nasa.gov/news/892/10-ways-osiris-rex-is-advancing-the-asteroid-frontier/

https://youtu.be/nmfS2Vb-B7o

https://www.nytimes.com/interactive/2019/03/19/science/osiris-rex-bennu-photos.html

This Is NASA's Best View Yet (and Closest, Too!) of Asteroid Bennu

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how many superfunds in america ? 1344.

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How many toxic waste sites are there in the US?

Over 18,000 sites and an associated 22 million acres of land are related to the primary hazardous waste programs that comprise much of the nation's hazardous waste infrastructure, and more than half of the U.S. population lives within three miles of a hazardous waste site.

What is Superfund? | Superfund | US EPA

What is Superfund?

Thousands of contaminated sites exist nationally due to hazardous waste being dumped, left out in the open, or otherwise improperly managed. These sites include manufacturing facilities, processing plants, landfills and mining sites.
 
In the late 1970s, toxic waste dumps such as Love Canal and Valley of the Drums received national attention when the public learned about the risks to human health and the environment posed by contaminated sites. 
 
CERCLA is informally called Superfund. It allows EPA to clean up contaminated sites. It also forces the parties responsible for the contamination to either perform cleanups or reimburse the government for EPA-led cleanup work.

When there is no viable responsible party, Superfund gives EPA the funds and authority to clean up contaminated sites.

https://fortune.com/2018/10/30/aerial-photos-superfund-sites-usa/