10 papers
Reversal of Spin: Comet 41P/Tuttle-Giacobini-Kresak
David Jewitt
The rotations of cometary nuclei are known to change in response to outgassing torques. The nucleus of comet 41P/Tuttle-Giacobini-Kresak exhibited particularly dramatic rotational…
Nucleus and Postperihelion Activity of Interstellar Object 3I/ATLAS Observed by Hubble Space Telescope
Man-To Hui, David Jewitt, Max J. Mutchler +2
We report the detection of the nucleus of interstellar object 3I/ATLAS, using a nucleus extraction technique on Hubble Space Telescope (HST) observations taken between December 202…
Pre-perihelion Development of Interstellar Comet 3I/ATLAS
David Jewitt, Jane Luu
We describe pre-perihelion optical observations of interstellar comet 3I/ATLAS taken during July - September 2025 using the Nordic Optical Telescope. Fixed aperture photometry of t…
Hubble Space Telescope Observations of the Interstellar Interloper 3I/ATLAS
David Jewitt, Man-To Hui, Max Mutchler +2
We present high angular resolution observations of the third known interstellar interloper, 3I/ATLAS, from the Hubble Space Telescope. The object is clearly active at 3.8 au pre-pe…
Down But Not Out: The Case of Long-Period Comet C/2021 O3 (Panstarrs)
David Jewitt. Jing Li, Michael Jaeger, Yoonyoung Kim
We combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs) (perihelion distance 0.287 au) in order to investigate its reported near-perihelion destr…
Multiple Outbursts of Halley-Type Comet 12P/Pons-Brooks
David Jewitt, Jane Luu
We present optical observations of Halley type comet 12P/Pons-Brooks on its approach to perihelion. The comet was active even in the first observations at about 8 au. Starting at 4…