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Table 4

Comparison of gas and dust activity of 103P/Hartley 2 at the 1991 (A’Hearn et al. 1995) and 2010 perihelion passages.

Date Log production rates Log Q(OH)

CN/OH C2/OH C3/OH Afρ/CN C2/CN

1991 –2.45 –2.36 –3.56 –23.47 0.08 28.31
2010 –3.24 –3.11 –4.21 –22.88 0.12 28.25a

Notes. 

(a)

From Biver et al. (2010, priv. comm.).

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