67 citations · 533 across the 29 of their papers we have counts for
29 papers
The Wagging Plasma Tail of Comet C/2020 S3 (Erasmus)
Jing Li, Yoonyoung Kim, David Jewitt
Long-period comet C/2020 S3 (Erasmus) reached perihelion at 0.398 au on UT 2020 December 12.67, making it a bright, near-Sun object. Images taken between mid-November and December…
A Single Ejection Model of the DART/Dimorphos Debris Trail
Yoonyoung Kim, David Jewitt
The collision of the NASA DART spacecraft with asteroid Dimorphos resulted in the formation of a distinctive and long-lived debris trail, formed by the action of solar radiation pr…
Physical Properties of the Young Asteroid Pair 2010 UM26 and 2010 RN221
David Jewitt, Yonyoung Kim, Jing Li +1
The main belt asteroids 458271 (2010 UM26) and 2010 RN221 share almost identical orbital elements and currently appear as comoving objects 30 arcsec apart in the plane of the sky.…
The Dimorphos Boulder Swarm
David Jewitt, Yoonyoung Kim, Jing Li +1
We present deep Hubble Space Telescope images taken to examine the ejecta from the DART spacecraft impact into asteroid Dimorphos. The images reveal an extensive population of co-m…
Comet 108P/Ciffreo: The Blob
Yoonyoung Kim, David Jewitt, Jane Luu +2
Short-period comet 108P/Ciffreo is known for its peculiar double morphology, in which the nucleus is accompanied by a co-moving, detached, diffuse 'blob'. We report new observation…
Disintegration of Long-Period Comet C/2021 A1 (Leonard)
David Jewitt, Yoonyoung Kim, Michael Mattiazzo +3
We present imaging observations of the disintegrating long-period comet C/2021 A1 (Leonard). High resolution observations with Hubble Space Telescope show no evidence for surviving…
Sublimation Origin of Active Asteroid P/2018 P3
Yoonyoung Kim, Jessica Agarwal, David Jewitt +4
Active asteroids show (typically transient) cometary activity, driven by a range of processes. A sub-set, sometimes called main-belt comets, may be driven by sublimation and so cou…
Hubble Space Telescope Observations of Active Asteroid P/2020 O1 (Lemmon-PANSTARRS)
Yoonyoung Kim, David Jewitt, Jessica Agarwal +3
We present Hubble Space Telescope observations of active asteroid P/2020 O1 taken to examine its development for a year after perihelion. We find that the mass loss peaks <~1 kg/s…
Fragmenting Active Asteroid 331P/Gibbs
David Jewitt, Jing Li, Yoonyoung Kim
We describe active asteroid 331P/Gibbs (2012 F5) using archival Hubble Space Telescope data taken between 2015 and 2018. 331P is an outer main-belt active asteroid with a long-live…
A polarimetric study of asteroids in comet-like orbits
Jooyeon Geem, Masateru Ishiguro, Yoonsoo P. Bach +16
Context. Asteroids in comet-like orbits (ACOs) consist of asteroids and dormant comets. Due to their similar appearance, it is challenging to distinguish dormant comets from ACOs v…
Cometary Activity Begins at Kuiper Belt Distances: Evidence from C/2017 K2
David Jewitt, Yoonyoung Kim, Max Mutchler +3
We study the development of activity in the incoming long-period comet C/2017 K2 over the heliocentric distance range 9 < r_H < 16 AU. The comet continues to be characterized by a…
Outbursting Quasi-Hilda Asteroid P/2010 H2 (Vales)
David Jewitt, Yoonyoung Kim
Quasi-Hilda asteroid P/2010 H2 (Vales) underwent a spectacular photometric outburst by 7.5 magnitudes (factor of 1000) in 2010. Here, we present our optical observations of this ev…
Component properties and mutual orbit of binary main-belt comet 288P/(300163) 2006 VW139
Jessica Agarwal, Yoonyoung Kim, David Jewitt +3
The binary asteroid 288P/(300163) is unusual both for its combination of wide-separation and high mass ratio and for its comet-like activity. It is not currently known whether ther…
Outburst and Splitting of Interstellar Comet 2I/Borisov
David Jewitt, Yoonyoung Kim, Max Mutchler +3
We present Hubble Space Telescope observations of a photometric outburst and splitting event in interstellar comet 2I/Borisov. The outburst, first reported with the comet outbound…
Coma Anisotropy and the Rotation Pole of Interstellar Comet 2I/Borisov
Yoonyoung Kim, David Jewitt, Max Mutchler +3
Hubble Space Telescope observations of interstellar comet 2I/Borisov near perihelion show the ejection of large (>~100 um) particles at <~9 m/s speeds, with estimated mass-loss rat…
The Nucleus of Interstellar Comet 2I/Borisov
David Jewitt, Man-To Hui, Yoonyoung Kim +3
We present high resolution imaging observations of interstellar comet 2I/Borisov (formerly C/2019 Q4) obtained using the Hubble Space Telescope. Scattering from the comet is domina…
Episodically Active Asteroid 6478 Gault
David Jewitt, Yoonyoung Kim, Jane Luu +4
We present imaging and spectroscopic observations of 6478 Gault, a 6 km diameter inner main-belt asteroid currently exhibiting strong, comet-like characteristics. Three distinct ta…
Active Asteroid P/2017 S5 (ATLAS)
David Jewitt, Yoonyoung Kim, Jayadev Rajagopal +7
Observations of active asteroid P/2017 S5 when near perihelion reveal the ejection of large (0.1 to 10 mm) particles at 0.2 to 2 m/s speeds, with estimated mass-loss rates of a few…
The 2016 Reactivations of Main-Belt Comets 238P/Read and 288P/(300163) 2006 VW139
Henry H. Hsieh, Masateru Ishiguro, Yoonyoung Kim +7
We report observations of the reactivations of main-belt comets 238P/Read and 288P/(300163) 2006 VW139, that also track the evolution of each object's activity over several months…
Search for Dust Emission from (24) Themis Using the Gemini-North Telescope
Henry H. Hsieh, Yoonyoung Kim, Alan Fitzsimmons +1
We report the results of a search for a dust trail aligned with the orbit plane of the large main-belt asteroid (24) Themis, which has been reported to have water ice frost on its…
Orbital Alignment of Main-Belt Comets
Yoonyoung Kim, Youngmin JeongAhn, Henry H. Hsieh
We examine the orbital element distribution of main-belt comets (MBCs), which are objects that exhibit cometary activity yet orbit in the main asteroid belt, and may be potentially…
Asteroid Family Associations of Active Asteroids
Henry H. Hsieh, Bojan Novakovic, Yoonyoung Kim +1
We report on the results of a systematic search for associated asteroid families for all active asteroids known to date. We find that 10 out of 12 main-belt comets (MBCs) and 5 out…
New observational evidence of active asteroid P/2010 A2: Slow rotation of the largest fragment
Yoonyoung Kim, Masateru Ishiguro, Myung Gyoon Lee
We report new observations of the active asteroid P/2010 A2 taken when it made its closest approach to the Earth (1.06 au in 2017 January) after its first discovery in 2010. Despit…
Anisotropic Ejection from Active Asteroid P/2010 A2: An Implication of Impact Shattering on an Asteroid
Yoonyoung Kim, Masateru Ishiguro, Tatsuhiro Michikami +1
We revisited a mass ejection phenomenon that occurred in asteroid P/2010 A2 in terms of the dynamical properties of the dust particles and large fragments. We constructed a model a…