We attempt to find a progenitor for the ultra-faint object Segue 1 under the assumption that it formed as a dark matter free star cluster in the past. We look for orbits, using the elongation of Segue 1 on the sky as a tracer of its path. Those orbits are followed backwards in time to find the starting points of our N-body simulations. The successful orbit, with which we can reproduce Segue 1 has a proper motion of mu_alpha = -0.19 mas/yr and mu_delta = -1.9 mas/yr, placing Segue 1 near its apo-galacticon today. Our best fitting model has an initial mass of 6224 Msun and an initial scale-length of 5.75 pc.
@article{arxiv.1606.08778,
title = {Could Segue 1 be a destroyed star cluster? - a dynamical perspective},
author = {Raul Dominguez and Michael Fellhauer and Matias Blaña and Juan-Pablo Farias and Jörg Dabringhausen and Graeme N. Candlish and Rory Smith and Nelvy Choque},
journal= {arXiv preprint arXiv:1606.08778},
year = {2016}
}