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PRECIOUS-Gold rebounds as dollar slips, but seen as vulnerable

* Gold has best month since Aug, up 3.1 pct in Jan

* Platinum on track for best month since Jan 2017

(Adds more analyst comment, updates prices, adds LONDON dateline) LONDON, Jan 31 (Reuters) - Gold prices rebounded on Wednesday as the dollar resumed its downtrend, but analysts said bullion was vulnerable to weakness ahead of the Lunar New Year and if bulls start shedding their long positions.

Spot gold was up 0.4 percent to $1,342.80 per ounce

since Jan. 23 at $1,334.10 an ounce.

U.S. gold futures for February delivery rose 0.5

percent to $1,342.10 per ounce. Gold got a boost as the dollar fell, putting the currency on track for its biggest monthly drop in nearly two years as U.S. President Donald Trump's first State of the Union address failed to offer any comfort to ailing dollar bulls. A weaker dollar makes commodities priced in the greenback cheaper for buyers using other currencies. Gold prices were on track for a third consecutive monthly gain and are up 3.1 percent so far in January, their best month since August, largely due to weakness in the dollar. Wednesday's bounce, however, may be only a short-term respite from a downtrend that began after gold touched a 1-1/2 high of $1,366.07 an ounce last week. "Seasonality is starting to fade ahead of the Chinese New Year, so you should not expect too strong physical demand at this point," said Joni Teves, precious metals analyst at UBS in London. "You also have long positioning building up quite significantly over the past six weeks, so that should put some pressure on the market. Hedge funds and money managers raised their net long position in COMEX gold contracts to a four-month high, data showed on Friday. Investors will also be keeping a keen eye on the U.S. Federal Reserve meeting later on Wednesday that is expected to leave interest rates unchanged while signalling a gradual tightening of monetary policy later this year. "Yellen may deliver a hawkish surprise, setting the stage for a possible policy pivot ... Gold bears may take advantage of this move," said Stephen Innes, APAC trading head for OANDA. A rate hike in March would not come as a surprise, but any change in the pace of hikes would pose a risk to gold's rally, Innes noted. Traders were also waiting for the U.S. jobs report on Friday that will include data on nonfarm payrolls and average hourly earnings.

In other precious metals, silver climbed 0.5 percent

to $17.22 per ounce, after hitting a one-week low of $17.03 earlier in the session.

Palladium was up 0.4 percent at $1,058.72 per ounce,

having fallen nearly 3 percent in the previous session to mark a five-week low at $1,047.00.

Platinum gained 0.5 percent to $1,000.80 per ounce.

It is up 8.4 percent for the month so far, on track for its best month since January 2017. It hit a one-week low the session before.

(Additional reporting by Nithin Prasad and Nallur Sethuraman in Bengaluru; Editing by Mark Potter)