Table 9
Properties of the parent body of H chondrites derived by different thermal evolution models, and some key data used for the modelling. In some models an insulating outer regolith layer is assumed; in that cases a core radius and layer thickness are given.
| Model | R | tform | Tsrf | M | K | cp | ρ | hf | Method | Sintering |
| km | Ma | K | kg | W/mK | J/kgK | kg/m3 | W/kg | |||
|
|
||||||||||
| Miyamoto et al. (1981) | 85 | 2.5 | 200 | 8.2 × 1018 | 1 | 625 | 3200 | 1.82 × 10-7 | analytic | – |
| Benoit & Sears (1996) | 99.0+1.0 | 2.2 | 200 | n.a.e | variabled | variableb | 3780a | n.a.e | numeric | √ + regolith |
| Akridge et al. (1998) | 97.5+2.5 | 2.3 | 200 | 1.4 × 1019 | variabled | variablec | 3450 | numeric | regolith | |
| Trieloff et al. (2003) | 100 | 2.5 | 300 | 1.3 × 1019 | 1 | 625 | 3200 | 1.82 × 10-7 | analytic | – |
| Kleine et al. (2008) | 100 | 2.7 | 300 | 8.2 × 1018 | 1 | 625 | 3200 | 1.82 × 10-7 | analytic | – |
| Harrison & Grimm (2010) | 99.2+0.8 | 2.2 | 170 | 1.4 × 1019 | variabled | variableb | 3250 | 1.82 × 10-7 | numeric | regolith |
| This work | 111 | 1.84 | 178 | 2.2 × 1019 | 1.75a | variableb | 3780a | 1.67 × 10-7 | numeric | √ |
|
|
||||||||||
| (6) Hebeg (today) | 93 | 1.28 × 1019 | 3810 | |||||||
| (diameter 205 × 185 × 170 km) | ± 6.4 × 1017 | ± 260 | ||||||||
Notes.
fit of cp to meteoritic data from Yomogida & Matsui (1984), at T = 500 the value is 865 J/kgK;
fit of K to meteoritic data from Yomogida & Matsui (1984), at T = 500 the value of the consolidated material is 3.66 W/mK and varies only slightly with temperature;
at time of CAI formation, given value for 26Al only, some models consider also the less efficient heat sources (60Fe, long lived radioactives);
from data collection Baer et al. (2011).
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