Mercedes is to unveil the company's 2013 Formula One car for Lewis Hamilton and Nico Rosberg ahead of February 5 pre-season test start in Spain. "We're pleased to announce that our new car, the F1W04 will be unveiled on Monday 4 February at the Circuito de Jerez!" Mercedes confirmed via Facebook and Twitter. The 2008 world champion Hamilton has joined Mercedes from McLaren, taking the place of retired seven-times champion Michael Schumacher. The team placed fifth in the 2012 constructors' list and now hopes for better results this time round.Other top teams, McLaren , Ferrari and Red Bull, launched their new car a few days earlier.