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Bennu is an [[active asteroid]],<ref>{{cite conference |last1=Connolly |first1=H |last2=Jawin |first2=E |last3=Ballouz |first3=R |last4=Walsh |first4=K |last5=McCoy |first5=T |last6=Dellagiustina |first6=D |title=OSIRIS-REx sample science and the geology of active asteroid Bennu |conference=82nd Meteoritical Society Meeting |date=2019 |page=2157|bibcode=2019LPICo2157.6209C |url=https://ui.adsabs.harvard.edu/abs/2019LPICo2157.6209C/abstract}}</ref><ref>{{cite conference |last1=Lim |first1=L |title=OSIRIS-REx update |conference=21st NASA Small Bodies Assessment Group |date=2019 }} "Bennu is an Active Asteroid!"</ref><ref name="barruccimichel">{{cite conference |last1=Barrucci |first1=M |last2=Michel |first2=P |title=Asteroid-Comet continuum: no doubt but many questions |conference=2019 EPSC-DPS conference |date=Sep 2019 |pages=202–1}}</ref><ref>{{cite conference |last1=Hergenrother |first1=C |last2=Adam |first2=C |last3=Antreasian |first3=P |last4=Al Asad |first4=M |last5=Balram-Knutson |first5=S |title=(101955) Bennu is an active asteroid |conference=2019 EPSC-DPS conference |date=Sep 2019 |pages=852–1 }}</ref> sporadically emitting [[Comet#Jets|plumes]] of particles<ref>{{cite web |url=https://www.asteroidmission.org/?mission_update=feb-11-2019 |title=Feb 11, 2019 |access-date=15 Nov 2019 }}</ref><ref>{{cite journal |last1=Hergenrother |first1=C |last2=Maleszweski |first2=C |last3=Nolan |first3=C |last4=Li |first4=J |last5=Drouet D'aubigny |first5=C |title=The Operational Environment and Rotational Acceleration of Asteroid (101955) Bennu from OSIRIS-REx Observations |journal=Nature Communications |volume=10 |issue=1 |page=1291 |date=19 Mar 2019 |doi=10.1038/s41467-019-09213-x |pmid=30890725 |pmc=6425024 |bibcode=2019NatCo..10.1291H }}</ref> and rocks as large as {{cvt|10|cm}},<ref name="Oberhaus 2019">[https://www.wired.com/story/no-one-knows-why-rocks-are-exploding-from-asteroid-bennu/ No One Knows Why Rocks Are Exploding From Asteroid Bennu.] Daniel Oberhaus, ''Wired''. 5 December 2019.</ref><ref name="Science_3544">{{cite journal|title = Episodes of particle ejection from the surface of the active asteroid (101955) Bennu|first1 = D. S. | last1 = Lauretta| first2 = C. W. |last2 = Hergenrother | first3 = S. R. | last3 = Chesley | first4 = J. M. | last4 = Leonard | first5 = J. Y. | last5 = Pelgrift | first6 = C. D. | last6 = Adam | first7 = M. | last7 = Al Asad|s2cid = 208764910 |display-authors=5| journal = Science | date = 6 Dec 2019| volume = 366 | issue = 6470 |pages = eaay3544 | doi = 10.1126/science.aay3544 |pmid = 31806784 |bibcode = 2019Sci...366.3544L |url = http://oro.open.ac.uk/68479/1/Lauretta_et_al_2019_accepted.pdf | doi-access = free }}.</ref> (not [[Comet dust#Size|dust]], defined as tens of micrometers).<ref>{{cite web |title=Definitions of terms in meteor astronomy |url=http://www.iau.org/static/science/scientific_bodies/commissions/f1/meteordefinitions_approved.pdf |access-date=31 Jul 2020}}</ref><ref>{{cite journal |last1=Grun |first1=E |last2=Krüger |first2=H |last3=Srama |first3=R |s2cid=208527737 |date=2019 |title=The Dawn of Dust Astronomy |journal=Space Science Reviews |volume=215 |issue=7 |page=46 |doi=10.1007/s11214-019-0610-1 |doi-access=free |arxiv=1912.00707 |bibcode=2019SSRv..215...46G}} 3. Multifaceted Scientific Dust Observations</ref> Scientists hypothesize the releases may be caused by thermal fracturing, volatile release through dehydration of [[phyllosilicate]]s, pockets of subsurface water,<ref name="nae20"/> and/or [[meteoroid]] impacts.<ref name="Science_3544"/>
Before the arrival of OSIRIS-REx, Bennu had displayed polarization consistent with [[Comet Hale-Bopp]] and [[3200 Phaethon]], a [[rock comet]].<ref name="Cellino2018" /> Bennu, Phaethon, and [[Manx comet|inactive Manx comets]]<ref>{{cite conference |last1=Boe |first1=B |last2=Jedicke |first2=R |last3=Wiegert |first3=P |last4=Meech |first4=K |last5=Morbidelli |first5=A |title=Distinguishing Between Solar System Formation Models with Manxes (or not) |date=Sep 2019 |conference=2019 EPSC-DPS conference |pages=626–2}}{{page needed|date=August 2021}}</ref> are examples of active asteroids.<ref>{{cite conference |last1=Gounelle |first1=M |title=The Asteroid-Comet Continuum: Evidence from Extraterrestrial Samples |date=2012 |conference=2012 European Planetary Science Congress |page=220 }}</ref><ref>{{cite book |last1=Rickman |first1=H |title=Origin and Evolution of Comets: Ten Years after the Nice Model, One Year after Rosetta |date=2018 |publisher=World Scientific |location=Singapore |pages=162–168}} Sec. 4.3 Dormancy and Rejuvenation</ref><ref name="barruccimichel"/> B-type asteroids displaying a blue color in particular, may be dormant comets,<ref>{{cite conference |last1=Nuth |first1=J |last2=Johnson |first2=N |last3=Abreu |first3=N |title=Are B-type Asteroids Dormant Comets? |url=https://www.hou.usra.edu/meetings/lpsc2019/pdf/3059.pdf |date=Mar 2019 |conference=50th LPSC |page=2132 }}</ref><ref>{{cite conference |last1=Schroder |first1=S |last2=Poch |first2=I |last3=Ferrari |first3=M |last4=De Angelis |first4=S |last5=Sultana |first5=R |title=Experimental evidence for the nature of Ceres blue material |url=https://meetingorganizer.copernicus.org/EPSC-DPS2019/EPSC-DPS2019-78-2.pdf |journal=Epsc-DPS Joint Meeting 2019 |volume=2019 |pages=EPSC–DPS2019–78 |date=Sep 2019 |conference=2019 EPSC-DPS conference |bibcode=2019EPSC...13...78S }}</ref><ref>{{cite conference |last1=Marsset |first1=M |last2=DeMeo |first2=F |last3=Polishook |first3=D |last4=Binzel |first4=R |title=Near-infrared spectral variability on the newly active asteroid (6478) Gault |journal=Epsc-DPS Joint Meeting 2019 |date=Sep 2019 |volume=2019 |pages=EPSC-DPS2019-280 |conference=2019 EPSC-DPS conference |bibcode=2019EPSC...13..280M }}</ref><ref>{{cite journal |last1=Fukai |first1=R |last2=Arakawa |first2=S |journal=The Astrophysical Journal |date=2021 |title=Assessment of Cr isotopic heterogeneities of volatile-rich asteroids based on multiple planet formation models |volume=908 |issue=1 |page=64 |doi=10.3847/1538-4357/abd2b9 |arxiv=2012.05467 |bibcode=2021ApJ...908...64F |s2cid=228084040 |doi-access=free }}</ref><ref name="nae20"/> similar to Ryugu but at an [[Extinct comet#Dormant comets|earlier stage]].<ref>{{cite journal |last1=Miura |first1=H. |last2=Nakamura |first2=E. |last3=Kunihiro |first3=T. |title=The Asteroid 162173 Ryugu: a Cometary Origin |journal=
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