Table 1
Best asteroid matches (ordered by the lowest χ2, performed on 139 normalized spectra) in terms of spectral slope for the Phobos blue unit, the Phobos red unit, and Deimos (Fraeman et al. 2014).
| Asteroids | Type(a) | χ2(b) | Albedo | |
|---|---|---|---|---|
| Phobos red unit | Schalen | Z | 0.0003 | 0.0510 ± 0.0097 |
| (pv = 0.0683 ± 0.0005) | Odysseus | D | 0.0007 | 0.0549 ± 0.0101 |
| Thule | Z | 0.0013 | 0.0404 ± 0.0075 | |
| Hidalgo | D | 0.0014 | 0.0603 | |
| Rovereto | Z | 0.0015 | 0.0771 ± 0.0148 | |
| Buda | Z | 0.0020 | 0.1373 ± 0.0264 | |
| Phobos blue unit | Hesperia | M | 0.0001 | 0.1855 ± 0.061 |
| (pv = 0.0837 ± 0.0005) | Sylvia | P | 0.0002 | 0.0389 ± 0.0072 |
| Kalliope | M | 0.0002 | 0.1428 ± 0.0281 | |
| Pandora | M | 0.0002 | 0.2587 ± 0.0704 | |
| Lydia | M | 0.0003 | 0.1482 ± 0.0299 | |
| Hilda | P | 0.0004 | 0.0496 ± 0.0093 | |
| Deimos | Odysseus | D | 0.0005 | 0.0549 ± 0.0101 |
| (pv = 0.068 ± 0.007) | Schalen | Z | 0.0006 | 0.0510 ± 0.0097 |
| Rovereto | Z | 0.0010 | 0.0771 ± 0.0148 | |
| Komppa | Z | 0.0012 | 0.0603 ± 0.0112 | |
| Buda | Z | 0.0022 | 0.1373 ± 0.0264 | |
| Hidalgo | D | 0.0023 | 0.0603 | |
Notes. (a) The spectral types follow the Mahlke classification (Mahlke et al. 2022). (b) The χ2 method was run on smooth and normalized spectra.
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