titius-bode law - mercury 0.4 au’s venus + 0.3 (0.7) earth + 0.6(1.0) mars+ 1.2(1.6) a. b.+...
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Titius-Bode Law - • Mercury 0.4 AU’s• Venus + 0.3 (0.7)• Earth + 0.6 (1.0)• Mars + 1.2 (1.6)• A. B. + 2.4 (2.8)• Jupiter + 4.8 (5.2)• Saturn + 9.6 (10.0)• Uranus +19.2(19.6) (Actually 19.2)• Neptune +38.4(38.8) (Actually 30)• Pluto is at 39.5
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The Titius-Bode law works very well for the first six planets and the asteroid belt, but not very well for the planets after that. The Titius-Bode law is probably just a curious coincidence.
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Mercury’s orbit is always within 0.5 AU of the Sun. It is always visually close to the Sun; therefore, it is only observed when low on the horizon (or during a solar eclipse).
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It is visible for at most 2 hours on any given night.
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Mercury was originally thought to be two planets. The Greeks called it Apollo when seen in the morning and Hermes when seen in the evening.
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Mercury’s surface is fairly reflective.
Albedo - the fraction of incident sunlight an object reflects into space.
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Mercury’s albedo is only about 0.1, similar to Earth’s Moon.
However, Mercury’s nearness to the Sun makes it one of the brightest objects in the night sky.
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The best pictures of Mercury are taken by large telescopes during the day.
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Mercury’s orbital period is 88 Earth days.
As viewed from the Earth, Mercury can pass over the surface of the Sun.
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This is called a transit (a smaller, darker object passes across a larger, brighter one).
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Transits of the Sun by Mercury are fairly rare. There are only twelve or so per century, always occurring in Nov. or May.
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Radius - 2450 km0.38 Earth radii
Mass - 3.3 x 1026 g0.055 Earth’s
Density - 5.4 g/cm3
slightly less than Earth’s
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Mercury is now the smallest planet. (It is larger than Pluto, so it was second smallest before Pluto’s demotion to dwarf planet.)
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Mercury’s rotational period is 59 days, which is 2/3 of a Mercury year.
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Mercury goes through three rotations for every two revolutions.
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There is a reason for this 2/3 ratio. Part of the reason is Mercury’s very eccentric orbit (very elliptic).
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This causes the orbital speed to vary greatly throughout the orbit.
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The orbital and rotational periods are synchronous at perihelion (closest approach to the Sun).
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How would this appear from Mercury?
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The Sun would move from east to west, except near perihelion, where rotation is slightly slower than orbital speed.
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At this time the Sun would appear to stop and go backward before it resumed its east to west motion.
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Mercury’s equator is exactly in the orbital plane, so Mercury has no axial tilt.
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