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Context: The recent discovery of a group of trans-neptunian objects (TNOs) ina narrow region of the orbital parameter space and with surfaces composed ofalmost pure water ice, being 2003 EL61 its largest member, promises new andinteresting results about the formation and evolution of the trans-neptunianbelt (TNb) and the outer Solar System.  Aims: The aim of this paper is to obtain information of the surfaceproperties of two members of this group ((24835) 1995 SM55, (120178) 2003 OP32)and three potential members (2003 UZ117, (120347) 2004 SB60 and 2005 UQ513) andto use that in order to confirm or reject their association.  Methods: We obtained visible spectra of five TNOs using the 3.58m TelescopioNazionale Galileo at the ''Roque de los Muchachos Observatory'' (La Palma,Spain)  Results: The spectra of the five TNOs are featureless within theuncertainties and with colors from slightly blue to red (-2<S'<18%/0.1microns). No signatures of any absorption are found.  Conclusions: We confirm the association of 1995 SM55 and 2003 OP32 with thegroup of 2003 EL61 as their spectra are almost identical to that of 2003 EL61.Only one of the three candidates, 2003 UZ117, can be considered as a possiblemember of the EL61-group, as its visible spectrum is compatible with a spectrumof a surface composed of almost pure water ice and no complex organics. Theother two, 2004 SB60 and 2005 UQ513 are red and must be considered asinterlopers.

Visible spectroscopy in the neighborhood of 2003 EL61