Properties of comet 8P/Tuttle derived from our Spitzer Space Telescope observations.
|Shape||Two spheres in contact (binary)|
|Size of each sphere||2.7 ± 0.1 km and 1.1 ± 0.1 km (radii)|
|Pole orientation||RA = 285 ± 12° and Dec = +20 ± 5°|
|Geometric albedo||0.042 ± 0.008 (R-band)|
|Roughness and thermal inertia|
|Valid combinations||η = 0.7 and I = 0–100 J K−1 m−2 s−1∕2|
|or η = 0.8 and I = 0 J K−1 m−2 s−1∕2|
|Water||1.1 ± 0.2 × 1028 s−1 (1.6 AU pre-peri.)|
|Dust ɛfρ||310 ± 34 cm (1.6 AU pre-perihelion)|
|325 ± 36 cm (2.2 AU post-perihelion)|
|Tdust||258 ± 10 K (1.6 AU pre-perihelion)|
|Grain size||≈10 μm (diameter)|
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