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M87 is the best source in which to study a jet at high resolution ingravitational units because it has a very high mass black hole and is nearby.The angular size of the black hole is second only to Sgr A*, which does nothave a strong jet. The jet structure is edge brightened with a wide openingangle base and a weak counterjet. We have roughly annual observations for 17years plus intensive monitoring at three week intervals for a year and five dayintervals for 2.5 months made with the Very Long Baseline Array (VLBA) at 43GHz. The inner jet shows very complex dynamics, with apparent motions bothalong and across the jet. Speeds from zero to over 2c are seen, withacceleration observed over the first 3 milli-arcseconds. The counterjetdecreases in brightness much more rapidly than the main jet, as is expectedfrom relativistic beaming in an accelerating jet oriented near theline-of-sight. Details of the structure and dynamics are discussed. The roughlyannual observations show side-to-side motion of the whole jet with acharacteristic time scale of about 9 years.

Observations of the Structure and Dynamics of the Inner M87 Jet