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By making use of the sub-arcsecond angular resolution of the High ResolutionCamera (HRC-I) aboard the Chandra X-ray satellite we have examined the centralcompact object RX J0822-4300, in the supernova remnant Puppis-A for a possibleproper motion. Using data which span an epoch of 1952 days we found theposition of RX J0822-4300, different by $0.574\pm0.184$ arcsec, implying aproper motion of $\mu=107.49\pm34.46$ mas/yr. For a distance of 2.2 kpc, thisproper motion is equivalent to a recoil velocity of $1121.79\pm 359.60$ km/s.The position angle is found to be $241^\circ \pm 24^\circ$. Since both themagnitude and direction of the proper motion are in agreement with the birthplace of RX J0822-4300, being near to the optical expansion center of thesupernova remnant, the result presented in this letter is a promisingindication of a fast moving compact object in a supernova remnant. Although thepositional shift inferred from the current data is significant at a$\sim3\sigma$ level only, one or more future HRC-I observations can obtain amuch larger positional separation and further constrain the measurement.Comment: Accepted by A&A letter on 8th August 200

Probing the proper motion of the central compact object in Puppis-A with the Chandra high resolution camera