ASTR 101 Lecture Notes - Lecture 41: Roche Limit, Kuiper Belt, Axial Tilt

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Neptu(cid:374)e"s rotatio(cid:374): (cid:1007)0o axial tilt (like mars, saturn, earth). Rotation speed of core is faster than rotation speed of atm (opposite all other planets). Atm: mostly h and he (like all jovians). Explains why neptune is more blue because methane absorbs more red light. Both have uniform temperatures side facing sun = side opposite sun. Magnetosphere 100x earth (not quite as strong as jupiter/saturn). centre of mf is not the centre of the planet. J and s have solid metallic h stro(cid:374)g mf. Liquid layer has dissolved ammonia produce a salt which is a conducting fluid. Convection currents in the liquid layer: very unusual. Titania and oberon: largest (>1500 km diameter earth"s (cid:373)oo(cid:374)). Uv radiation and carbony and icy rocks generate hydrocarbons which freeze to surface. Neptu(cid:374)e"s (cid:373)oo(cid:374)s: trito(cid:374): (cid:448)oyager (cid:1006) passed (cid:449)ithi(cid:374) (cid:1006)(cid:1006) 000 k(cid:373) of trito(cid:374). Only moon to have any of these properties yet. Triton started out as a kuiper belt object.

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