Astronomy & Astrophysics

**Table 2:** Observing log; SCG 2159-3210 has not been observed by us in the optical and related results are taken from the literature.
Group	Date of observations	Telescope and instrument	Filter	Pixel scale	Exposure time	Zero-Point
				(arcsec)	(s)
SCG 2353-6101	August 1996	Danish 1.54 m+DFOSC	ESO#452 (R)	0.39	3 $\times$ 200	23.92 $\pm$ 0.03
SCG 0018-4854	August 1996	Danish 1.54 m+DFOSC	ESO#452 (R)	0.39	3 $\times$ 200	23.92 $\pm$ 0.03
SCG 0122-3819	August 1996	Danish 1.54 m+DFOSC	ESO#452 (R)	0.39	3 $\times$ 200	23.92 $\pm$ 0.03
SCG 0141-3429	January 2006	3.6 m telescope+EFOSC2	ESO#642 (R)	0.32	5 $\times$ 90	26.20 $\pm$ 0.02
SCG 0227-4212	August 1996	Danish 1.54 m+DFOSC	ESO#452 (R)	0.39	3 $\times$ 200	23.92 $\pm$ 0.03