We have carried out multi-epoch, time-series differential I-band photometry of a large sample of objects in the south-east region of the young (˜3 Myr), nearby (˜350 pc) σ Orionis open cluster. A field of ˜1000 arcmin2 was monitored during four nights over a period of two years. Using this dataset, we have studied the photometric variability of

Photometric and spectroscopic data of the southern contact binary GSC04778-00152 are presented. Six new times of minimum are listed. For modelling purposes, we provide UBVRI phase diagrams of the contact binary with the contribution of the nearby companion removed.

VRI photometry of the type Ia supernova 2002bo is presented. This SN exploded in a dusty region of the host galaxy NGC 3190, thus, subtraction of a template frame was necessary to obtain reliable photometry. We used a template frame of NGC 3190 taken during the course of our galaxy imaging project, fortunately, just a few days before SN 2002bo was

Context. The CoRoT satellite has recently discovered the transits of an Earth-like planet across the disc of a late-type magnetically active star dubbed CoRoT-7, while a second planet was detected after filtering out the radial velocity (hereafter RV) variations due to stellar activity. Aims: We investigate the magnetic activity of CoRoT-7 and use

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