Table 4
Summary of the observed behavior and physical properties for the small and big lobe of comet 67P.
| Small lobe (Wosret) | Big lobe | References | |
|---|---|---|---|
| Incoming solar flux | ~550 W m−2 | ~550 W m−2 (Anhur and Khonsu) | Marshall et al. (2017) |
| Morphology | Consolidated material that appears highly fractured with occasional pits | Consolidated material with significant intermediate scale roughness (Anhur) | Thomas et al. (2018) |
| Exposed water ice | In a few and small bright spots (~m2) | In many bright spots and some in big patches (1500 m2) | This work, Fornasier et al. (2016, 2019a) |
| Relatively blue area enriched in frost/ice | In very spatially limited area, periodic, not frequently observed | In extended area, periodic often observed | This work, Hasselmann et al. (2019), Fornasier et al. (2016, 2017, 2019a) |
| Average goosebump diameter | The largest in 67P: 4.7 ± 1.5 m | 2.2–3.2 m (Seth, Imhothep, Anubis, Atum) | This work, Sierks et al. (2015), Davidsson et al. (2016) |
| Level of activity | Very high | Very high | This work, Fornasier et al. (2019b), Hasselmann et al. (2019) |
| Surface morphology changes | Few and not so important: a relatively small cavity, local dust removal (~1m depth) revealing a cluster of outcrops | Many and important: local dust removal up to 14 m in depth, new relatively big scarps and cavities, big vanishing structures, boulders displacements&fragmentation | This work, Fornasier et al. (2017, 2019a), Hasselmann et al. (2019) |
| Surface mass loss | ~1.2 × 106 kg | >50 × 106 kg in Anhur ~2 × 108 kg in Khonsu | This work, Fornasier et al. (2019a) Hasselmann et al. (2019) |
Notes. These properties are derived from the investigation of southern hemisphere regions submitted to similar high heating at perihelion. For the small lobe, we consider the results on Wosret presented in this work, while for the big lobe, we refer to results from the literature mainly focused on the Anhur and Khonsu regions.
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