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Results are discussed of an X-ray and optical observation campaign of thelow-mass X-ray binary A1246-58 performed with instruments on Satellite perAstronomia X ('BeppoSAX'), the Rossi X-ray Timing Explorer (RXTE), the X-rayMulti-mirror Mission ('XMM-Newton'), the Swift mission, and the Very LargeTelescope. Spectra and flux time histories are studied. The most importantresults are the lack of hydrogen spectral features in the optical spectrum,supporting the proposition that this is an ultracompact X-ray binary (UCXB),the determination of a 4.3 kpc distance from time-resolved spectroscopy ofthermonuclear X-ray bursts, and the detection of intermediately longthermonuclear bursts as seen in a number of other UCXBs. There is evidence fora Ne/O abundance ratio in the line of sight that is higher than solar andvariable. This may be due to different changes in the ionization degrees of Neand O, which may be related to the variable irradiating flux. We discuss thespectral variability and the peculiarities of the long-term light curve.

An X-ray and optical study of the ultracompact X-ray binary A1246-58