With the new sporty looking three-door Astra GTC on its way and the Astra Sedan outlined by its sister models from Buick’s US (2012 Verano) and China (Excelle) divisions, the only body style left to complete the range of Opel’s C-segment model series is the convertible version.

Recently, our spies in Germany caught a glimpse of an Astra-based model, which appears to be the cabriolet variant of the series. While we can’t be 100 percent sure, it is clear that this Astra has a boot while the close ups reveal a more raked rear windshield line than you’d normally expect to see on a four-door family sedan.

To get an idea of what the Astra Convertible might look like, here’s our artist’s impression based on the upcoming GTC model. Even though our image of Opel’s VW Golf Cabriolet contender was styled with a soft-top, it has not yet been revealed if the German company will adopt this solution or if it will continue to use the current Astra TwinTop’s retractable metal roof.

Either way, Opel and its sister company in Britain, Vauxhall, have confirmed that a new Astra-based convertible will go on sale across the continent in the beginning of 2013, which means we’ll most likely see a concept version earlier.

The production model will be offered with the same family of diesel and gasoline engines found on the rest of the Astra range including a choice of 1.4-liter and 1.6-liter turbocharged petrol units.

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