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The merging system SIT 45 (UGC 12589) is an unusual isolated galaxy triplet,consisting of three merging late-type galaxies, out of 315 systems in the SIT(SDSS-based catalogue of Isolated Triplets). The main aims of this work are tostudy its dynamical evolution and star formation history (SFH), as well as itsdependence on its local and large-scale environment. To study its dynamics,parameters such as the velocity dispersion ($\sigma_{v}$), the harmonic radius($R_{H}$), the crossing time ($H_0t_c$), and the virial mass ($M_{vir}$), alongwith the compactness of the triplet ($S$) were considered. To constrain theSFH, we used CIGALE to fit its observed spectral energy distribution usingmulti-wavelength data from the ultraviolet to the infrared. According to itsSFH, SIT 45 presents star-formation, where the galaxies also present recent($\sim $200 Myr) star-formation increase, indicating that this activity mayhave been triggered by the interaction. Its dynamical configuration suggeststhat the system is highly evolved in comparison to the SIT. However this is notexpected for systems composed of star-forming late-type galaxies, based onobservations in compact groups. We conclude that SIT 45 is a system of threeinteracting galaxies that are evolving within the same dark matter halo, whereits compact configuration is a consequence of the on-going interaction, ratherthan due to a long-term evolution (as suggested from its $H_0t_c$ value). Weconsider two scenarios for the present configuration of the triplet, one whereone of the members is a tidal galaxy, and another where this galaxy arrives tothe system after the interaction. Both scenarios need further exploration. Theisolated triplet SIT 45 is therefore an ideal system to study short timescalemechanisms ($\sim 10^8$ years), such as starbursts triggered by interactionswhich are more frequent at higher redshift.

SIT 45: An interacting, compact, and star-forming isolated galaxy triplet