Fig. 4

Thermal conductivity as a function of temperature as derived for different small bodies. Data for C-class asteroids Bennu (Emery et al. 2014; Dellagiustina et al. 2019; Rozitis et al. 2019) and Ryugu (Müller et al. 2017; Hamm et al. 2020), for average near-Earth asteroids (Delbo et al. 2007), for comets 9P/Tempel 1 (Groussin et al. 2013; Davidsson et al. 2009), 103P/Hartley (Groussin et al. 2013), and 67P/Churyumov–Gerasimenko (Spohn et al. 2015), for S-class asteroids Itokawa (Fujiwara et al. 2006) and Eros (Lebofsky and Rieke 1979; Harris and Davies 1999) are shown together with the current best estimate for Phobos (Kuzmin and Zabalueva 2003). For comparison, the thermal conductivity of the lunar regolith (Hayne et al. 2017) is also given