* Euro <EUR=> off highs as peripheral spreads widen
* Investors shrug off robust German growth data
* Traders await U.S. retail sales, inflation data
* Euro could fall as low as $1.2735 - analyst
(Adds quotes, updates prices)
By Anirban Nag
LONDON, Aug 13 (Reuters) - The euro turned lower on Friday, giving up modest gains as worries about peripheral economies returned to dog investors who were briefly encouraged by strong German growth data earlier in the session.
Traders said stop-loss selling in the euro <EUR=> accelerated after the single currency fell below $1.2820. The latest drop in the euro came as the spread between Spanish and benchmark German 10-year government bonds widened to 172 basis points, the highest since July 19.
The spread between 10-year Greek and German bonds went out to its widest since late June after uninspiring results in an Italian bond auction prompted investors to pare positions in the euro on debt concerns. [
]Earlier, the euro had risen after data showed Germany's economy grew more than expected in the second quarter. German preliminary gross domestic product (GDP) rose 2.2 percent in the three months to June, much higher than forecasts for a 1.3 percent gain. [
]Growth for the entire euro zone rose 1.0 percent in the second quarter, but some peripheral economies were struggling, highlighting the two-speed nature of the euro zone's recovery. [
]But the boost for the euro turned out to be short-lived with many using the bounce to sell.
"The euro failed to hold on to the gains made after the German GDP numbers as the peripheral economies are still struggling and worries about a global recovery remain," said Ian Stannard, senior currency strategist at BNP Paribas.
"With risk appetite falling and volatilities rising, we could see the euro fall as low as $1.2735, which is technically pretty significant."
That level was the low struck on July 22.
By 1106 GMT, the euro was down 0.2 percent from late U.S. trade on Thursday at $1.2805 <EUR=>, having risen to a session high of $1.2906. It was on track to fall 3.4 percent against the dollar on the week, its biggest drop since mid-May.
On Wednesday, the dollar logged its biggest one-day percentage rise against the euro since October 2008, as concerns about the global economic outlook prompted investors to cut positions in riskier assets.
The dollar index, a gauge of the greenback's performance against six major currencies, was unchanged at 82.63 <.DXY>, after rising 0.4 percent on Thursday. On the week, it was tracking a rise of 2.6 percent, its best since mid-May.
Traders will eye U.S. retail sales, which will give a first look into consumer spending in the third quarter. U.S. consumer inflation is expected to show a rise of 0.2 percent in July. <ECON>
UPWARD BIAS FOR YEN
The yen, which hit 15-year highs against the dollar earlier this week, pulled back on news Japan's prime minister and the central bank chief would meet next week to discuss the yen. [
]The greenback stood at 85.68 yen <JPY=> after rising to 86.21 yen. Resistance was seen ahead of stops at 86.30/50 yen.
Japanese authorities heightened their rhetoric, and the Bank of Japan was seen checking rates on Thursday after the yen climbed to 84.72 yen on Wednesday, its highest since July 1995.
"We're seeing a bit of a pullback on worries of what might happen over the weekend, but we see the risk of intervention as low, and have a positive view on the yen," said Adam Cole, global head of FX strategy at RBC Capital Markets.
Market players say they do not expect actual intervention unless the dollar makes a move towards its record low of 79.75 yen, or the drop becomes more volatile.
"This is an opportunity to cover some short (dollar) positions, but traders are likely to continue to target a break of 80 yen," said Tsutomu Soma, senior manager of foreign securities at Okasan Securities. (Additional reporting by Tamawa Desai in London; Editing by Hugh Lawson)