We present the first trigonometric parallax and distance for a young planetary mass object .
A likely TW Hya cluster member , 2MASSW J1207334-393254Ab ( hereafter 2M1207Ab ) is an M8 brown dwarf with a mid to late L type planetary mass companion .
Recent observations of spectral variability have uncovered clear signs of disk accretion and outflow , constraining the age of the system to < 10 Myr .
Because of its late spectral type and the clearly youthful nature of the system , 2M1207b is very likely a planetary mass object .
We have measured the first accurate distance and luminosity for a self-luminous planetary mass object .
Our parallax measurements are accurate to < 2 mas ( 1 \sigma ) for 2M1207Ab .
With 11 total epochs of data taken from January 2006 through April 2 007 ( 475 images for 2M1207Ab ) , we determine a distance of 58.8 \pm 7.0 pc ( 17.0 ^ { +2.3 } _ { -1.8 } mas , 1.28 \sigma ) to 2M1207Ab and a calculated luminosity of 0.68-2.2 \times 10 ^ { -5 } L _ { \odot } for 2M1207b .
Hence 2M1207Ab is a clear member of the TW Hya cluster in terms of its distance , proper motions , and youthful nature .
However , as previously noted by Mohanty and co-workers , 2M1207b ’ s luminosity appears low compared to its temperature according to evolutionary models .