The Impossible Astronaut had a final consolidated audience figure of 8.86 million viewers, a 43.3% share of the total TV audience, according to figures released by Barb.
The number includes those who recorded the programme for viewing within 7 days of its initial showing. The figure is over two million higher than the initial overnight reported rating. A full report for the week, which will reveal the shows position in the weekly charts will be released by Barb on Tuesday.
The figures do not include those watching on iPlayer, where over 300,000 accessed the programme within the first two days following transmission.
The Impossible Astronaut had roughly the same final audience as other new series openers, excluding those with a new Doctor. New Earth had 8.6 million, Smith And Jones 8.7m and Partners In Crime 9.1 million.
An additional 0.47 million watched the BBC Three repeat on Friday.
Meanwhile in Australia the show was the fourth watched programme of the day with around 0.86 million viewers in the five capital cities. The rating similar to that achieved by A Christmas Carol, shown on Boxing Day. It was only outranked by news programmes.