Upper images: comet Hale-Bopp at 30.7 AU solar distance, on December 4, 2010. The field of view is 267  ×  157; north is up, east is to the left. The brightest star in the image is 2MASS J00395120-8632270, which has an R magnitude of 12.93  ±  0.06. Lowest panel: comparison of the measured astrometric positions (open dots with errors) and the JPL predictions (solid dots). Error bars denote the 2-sigma level confidence intervals of the measured positions.