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Table 1:

Geometric information about the dust tails of 133P/Elst-Pizarro.
  Phase   Tail 1 Tail 2
Date Angle PA$_{\odot}$(1) PA(2) projected length(3) PA(2) projected length(3)
yyyy mm dd ($^\circ$) ($^\circ$) ($^\circ$) (10(3) km) ($^\circ$) (10(3) km)
2007 05 22 19.7 256.2 257 - - -
2007 07 13 3.4 248.1 255 18 - -
2007 07 17 1.7 237.7 256 17 - -
2007 08 01 5.0 85.7 257 12 - -
2007 08 05 6.7 84.2 260 12 81 3
2007 08 09 8.2 83.4 258 12 82 4
2007 08 30 15.3 81.9 262 7 82 6
2007 09 19 19.6 81.0 261 4 81 10
2007 09 24 20.3 80.7 261 - 81 10

Notes. (1) Position angle of the antisolar vector. (2) Position angle of the tail. (3) Approximate tail extension obtained using the contour level $Af = 7 \times 10^{-9}$ of Fig. 1, averaged in the R and V filters.


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