We conducted a satellite search around the dwarf planet 1 Ceres using Hubble Space Telescope and ground-based Palomar data. No candidate objects were found orbiting Ceres in its entire stability region down to ~500km from the surface of Ceres. Assuming a satellite would have the same albedo as Ceres, which has a visual geometric albedo of 0.07-0.10, our detection limit is sensitive to satellites larger than 1-2 km in diameter.
@article{arxiv.1104.2028,
title = {A Search for Satellite around Ceres},
author = {A. Bieryla and J. Wm. Parker and E. F. Young and L. A. McFadden and C. T. Russell and S. A. Stern and M. V. Sykes and B. Gladman},
journal= {arXiv preprint arXiv:1104.2028},
year = {2015}
}