Table 1
Comet and KBO sizes.
| Object | a (km) | b (km) | c (km) | b/a | c/a | c/b | Fit | Ref |
|---|---|---|---|---|---|---|---|---|
| 1P/Halley | 15.30 | 7.22 | 7.20 | 0.472 | 0.471 | 0.997 | shape | 1 |
| 8P/Tuttle | ||||||||
| big lobe | 5.75 | 4.11 | 4.11 | 0.715 | 0.715 | 1.000 | prolate | 2 |
| small lobe | 4.25 | 3.27 | 3.27 | 0.769 | 0.769 | 1.000 | prolate | 2 |
| 9P/Tempel 1 | 7.6 | 4.9 | 4.9 | 0.645 | 0.645 | 1.000 | shape | 3 |
| 19P/Borrelly | 8.00 | 3.16 | 3.16 | 0.395 | 0.395 | 1.000 | prolate | 4 |
| 67P/Churyumov-Gerasimenko | 4.34 | 2.60 | 2.12 | 0.599 | 0.488 | 0.815 | shape | 5 |
| big lobe | 4.10 | 3.52 | 1.63 | 0.859 | 0.398 | 0.463 | shape | 5 |
| small lobe | 2.50 | 2.14 | 1.64 | 0.856 | 0.656 | 0.766 | shape | 5 |
| 81P/Wild 2 | 5.5 | 4.0 | 3.3 | 0.727 | 0.600 | 0.825 | ellipsoid | 6 |
| 103P/Hartley 2 | 2.33 | 0.69 | 0.69 | 0.296 | 0.296 | 1.000 | shape | 7 |
| 11/2017 U1 (‘Oumuamua) | ||||||||
| DISC | 0.115 | 0.111 | 0.019 | 0.965 | 0.165 | 0.171 | ellipsoid | 9 |
| CIGAR | 0.324 | 0.042 | 0.042 | 0.130 | 0.130 | 1.000 | ellipsoid | 9 |
| (486958) Arrokoth | 35.95 | 19.90 | 9.75 | 0.539 | 0.264 | 0.490 | shape | 8 |
| big lobe | 21.20 | 19.90 | 9.05 | 0.939 | 0.427 | 0.455 | shape | 8 |
| small lobe | 15.75 | 13.85 | 9.75 | 0.879 | 0.619 | 0.704 | shape | 8 |
Notes. Axis dimensions a, b, and c are diameters. Fit refers to how the axis dimensions were estimated: shape model (shape), triaxial ellipsoid fit (ellipsoid), or prolate ellipsoid fit (prolate). For prolate models, the two small axes b and c are equal. A shape model is a 3D reconstruction of the shape of the object based on images taken by the spacecraft.
References. (1) Merenyl et al. (1990); (2) Harmon et al. (2010); (3) A’Hearn et al. (2005); (4) Buratti et al. (2004); (5) Jorda et al. (2016); (6) Duxbury et al. (2004); (7) A’Hearn et al. (2011); (8) Keane et al. (2022); (9) Mashchenko (2019).
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