Enlargement of depressions on comet 81P/Wild 2: Constraints based on 30-year cometary activity in the inner Solar System

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Table 2

Summary of our findings presented in Sects. 2–4.

Region	$m_{H_{2} O} Q_{H_{2} O}$ ${m_{{{\rm{H}}_2}{\rm{O}}}}{Q_{{{\rm{H}}_2}{\rm{O}}}}$ ^(a)	M_escape ^(b)	M_fallback ^(c)	M_fallback /M_escape	M_excavate ^(d)	M_depression ^(e)	M_excavate / M_depreesion
	(10⁹ kg)	(10⁹ kg)	(10⁹ kg)		(10⁹ kg)	(10⁹ kg)
Entire	4.6–9.5	11.3	${4.1}_{- 4.1}^{+ 14.8}$ ${4.1_{ - 4.1}^{ + 14.8}}$	${0.36}_{- 0.36}^{+ 1.32}$ ${0.36_{ - 0.36}^{ + 1.32}}$	15.9–39.6
Explored	1.3–2.7	2.3	${1.0}_{- 1.0}^{+ 3.1}$ ${1.0_{ - 1.0}^{ + 3.1}}$	${0.36}_{- 0.36}^{+ 1.32}$ ${0.36_{ - 0.36}^{ + 1.32}}$	3.7–9.1	${174.5}_{- 28.6}^{+ 15.0}$ $174.5_{ - 28.6}^{ + 15.0}$	0.02–0.06

Notes. ^(a)Water production mass during one comet orbit. ^(b)Dust escape mass during one comet orbit (Pozuelos et al. 2014a). ^(c)Dust fallback mass during one comet orbit. The center values are decided when α_v = 1.0, and the lower and upper limits are when α_v = 0.5 and α_v = 1.5, respectively. ^(d)Excavated mass during one comet orbit $(m_{H_{2} O} Q_{H_{2} O} + M_{escape} + M_{fallback})$ $\left( {{m_{{{\rm{H}}_2}{\rm{O}}}}{Q_{{{\rm{H}}_2}{\rm{O}}}} + {M_{{\rm{escape}}}} + {M_{{\rm{fallback}}}}} \right)$ . ^(e)Depressions mass converted from their volumes with ρ_bulk = 600 kg m⁻³.

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