PI: Beatrice Mueller, Planetary Science Institute, email@example.com
Address: 1700 E. Ft. Lowell, #106, Tucson, Arizona 85719, United States
CoI: Nalin Samarasinha, Planetary Science Institute
CoI: Jean-Baptiste Kikwaya Eluo, Vatican Observatory
Title: Tying Changes in Cometary Rotation to Nuclear Activity: A Substantial Increase in the Database
Abstract: In a recent paper, Samarasinha and Mueller (2013) introduced a parameter, X, to describe the changes in the rotational period of a comet in terms of the rotational period itself, the nuclear radius, and the orbital characteristics. They showed that X should be a constant if the bulk densities and shapes of the nuclei are nearly identical and the activity patterns are similar for all comets. For four nuclei (2P/Encke, 9P/Tempel 1, 10P/Tempel 2, and 103P/Hartley 2) for which rotational changes are well documented, despite the nearly factor 30 variation observed among the effective active fractions of these comets, X is constant to within a factor two (see Table 1). If that is the case for all comets, X can be used as a predictor for rotational changes. We propose to observe comets 46P/Wirtanen, 19P/Borrelly (and P/2004 R1 (McNaught) if it is sufficiently bright) to add two or three comets to the sample listed above and to derive accurate rotation periods, and eventually to determine the change in the respective rotation periods to confirm the near-constancy of the parameter X.
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