At 1 pm Thursday, the core equity indices i.e., Sensex and Nifty 50 were trading lower for the second day. The Sensex was at 58,645.72 down by 142.30 points or 0.24 per cent, while Nifty was at 17,522.60 down by 40.65 points or 0.23 per cent from the last trading session.