By Angela Moon
NEW YORK (Reuters) - Stock index futures rose on Wednesday, a day after Wall Street suffered its worst session since August on geopolitical turmoil in Libya.
* The unrest kept U.S. crude futures climbing to a 2-1/2-year peak above $96 a barrel. Investors were concerned the turmoil could spread to other top oil producers in the region and cut more output, weighing on energy stocks.
* A senior aide to Muammar Gaddafi's influential son Saif resigned, the latest top official to walk out after the Libyan leader vowed to crush a revolt that threatened his four-decade rule.
* S&P 500 futures rose 5 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures gained 47 points, and Nasdaq 100 futures added on 11.5 points.
* But European stocks fell for a third consecutive session, down 0.3 percent in morning trade, with tech shares among the top losers.
* U.S. technology shares will be in the spotlight after Hewlett-Packard Co
* Investors will also watch January existing home sales data, due at 10 a.m. EST. Existing home sales are expected to fall in January to an annualized rate of 5.24 million units from 5.28 million, according to a Reuters survey.
* Nasdaq OMX Group Inc
* The Federal Reserve's monetary policy should remain accommodative for some time yet, Chicago Federal Reserve President Charles Evans told the Financial Times.
* The U.S. Air Force may announce whether Boeing Co
* Car rental company Hertz Global Holdings Inc
(Reporting by Angela Moon; editing by Jeffrey Benkoe)