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Multiyear Ground-based Survey Photometry of Active Comet 103P/Hartley 2 and Centaur (2060) Chiron: A Tale of Two Comets in the Pre-LSST Era

Authors: Joseph Murtagh, Megan E. Schwamb, Michael S. P. Kelley, Matthew M. Knight, Thomas Lehmann, Giannantonio Milani, A. Fraser Gillan, Alan Fitzsimmons, Ryan R. Lyttle, Matthew M. Dobson, Carrie E. Holt, Tim Lister, Joseph P. Chatelain, Sarah Greenstreet, Quanzhi Ye, 泉志叶, Henry H. Hsieh, Denis Bodewits, Tracy X. Chen, Richard G. Dekany, Matthew J. Graham, Steven L. Groom, George Helou, Mansi M. Kasliwal, Ashish A. Mahabal, Reed Riddle

Joseph Murtagh et al 2026 The Planetary Science Journal 7 .

Provider: AAS Journals

Caption: Figure 2.

Example observations of 103P/Hartley 2 for survey/telescopes (left) ATLAS, (middle) ZTF, and (right) LCO/LOOK. On all images, the scale of the aperture size used is demarcated by a horizontal white line of length 10,000 km. All panels have been rotated so that north is up and east is left. Also marked on each image are the antisolar vector (yellow) and antimotion vector (cyan), as obtained from JPL Horizons. On all images there is a varying degree of extension as 103P moves away from its perihelion passage date of 2023 October 12.

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