Table 5
Properties and possible composition of M-type asteroids.
| Number | Name | Density (g cm−3) | Radar albedo | SS5 | Potential main composition | Potential subsurface composition | Potential surface composition |
|---|---|---|---|---|---|---|---|
| 16 | Psyche | 3.70±0.60–k20±0.60(aa) | 0.37±0.09 | 0.46238 | IMs | IMs or EH | IMs |
| 21 | Lutetia | 3.45±0.21(a); 3.40±0.30(b) | 0.24±0.07 | 0.12613 | ECs | ECs | EL |
| 22 | Kalliope | 3.35±0.33–4.36±0.50(bb) | 0.15±0.05 | 0.29601 | ECs or IMs | ECs | EH? |
| 97 | Klotho | 4.16±0.62(c) | 0.26±0.05 | 0.14219 | IMs | ECs | EL |
| 110 | Lydia | No data | 0.37±0.10 | 0.31249 | – | IMs or EH | EH? |
| 135 | Hertha | 4.50±0.70(d) | 0.18±0.05 | 0.20695 | IMs | ECs | EL? |
| 161 | Athor | No data | 0.22±0.06 | 0.23059 | – | ECs | EL? |
| 201 | Penelope | No data | 0.40±0.10 | 0.18491 | – | IMs or EH | EL |
| 216 | Kleopatra | 3.38±0.50–5.00±0.70(cc) | 0.43±0.10 | 0.24372 | ECs or IMs | IMs or EH | EL? |
| 224 | Oceana | No data | 0.25±0.10 | 0.29717 | – | ECs | EH? |
| 325 | Heidelberga | No data | 0.17±0.08 | 0.33339 | – | ECs | EH? |
| 347 | Pariana | No data | 0.36±0.09 | 0.14411 | – | IMs or EH | EL |
| 441 | Bathilde | No data | 0.20±0.05 | 0.30583 | – | ECs | EH? |
| 872 | Holda | No data | No data | 0.32747 | – | – | EH? |
Notes. Density data are collected from (a) Vernazza et al. (2021), (b) Sierks et al. (2011), (c) Carry (2012), (d) Hanuš et al. (2017), (aa) (Hanuš et al. 2017; Shepard et al. 2017; Viikinkoski et al. 2018; Drummond et al. 2018; Ferrais et al. 2020; Siltala & Granvik 2021; Vernazza et al. 2021), (bb) (Descamps et al. 2008; Hanuš et al. 2017; Vernazza et al. 2021), (cc) (Descamps et al. 2011; Hanuš et al. 2017; Marchis et al. 2021; Vernazza et al. 2021). Radar albedo data are collected from “Radar-detected asteroids with radar-measured parameters” database web (http://www.johnstonsarchive.net/astro/radarasteroids.html). “–” means the composition is unknown.
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