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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…
Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
David Jewitt, Jane Luu, Jayadev Rajagopal +4
We present observations of the interstellar interloper 1I/2017 U1 ('Oumuamua) taken during its 2017 October flyby of Earth. The optical colors B-V = 0.700.06, V-R = 0.450…
The Structure of the β Leonis Debris Disk
Nathan D. Stock, Kate Y. L. Su, Wilson Liu +6
We combine nulling interferometry at 10 μm using the MMT and Keck Telescopes with spectroscopy, imaging, and photometry from 3 to 100 μm using Spitzer to study the debris disk arou…