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Published December 2008 | Accepted Version
Journal Article Open

Tentative detection of the rotation of Eris


We report a multi-week sequence of B-band photometric measurements of the dwarf planet Eris using the Swift satellite. The use of an observatory in low-Earth orbit provides better temporal sampling than is available with a ground-based telescope. We find no compelling evidence for an unusually slow rotation period of multiple days, as has been suggested previously. A not, vert, similar1.08 day rotation period is marginally detected at a modest level of statistical confidence (~97%). Analysis of the combination of the Swift data with the ground-based B-band measurements of Rabinowitz et al. [Rabinowitz, D.L., Schaefer, B.E., Tourtellotte, S.W., 2007. Astron. J. 133, 26–43] returns the same period (~1.08 day) at a slightly higher statistical confidence (~99%).

Additional Information

© 2008 Elsevier. Received 30 April 2008; revised 28 July 2008. Available online 4 September 2008. We thank David Rabinowitz and an anonymous referee.

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Accepted Version - 0808.4130.pdf


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