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Lecture 13

ASTA01H3 Lecture Notes - Lecture 13: Clyde Tombaugh, Lowell Observatory, Blink Comparator


Department
Astronomy
Course Code
ASTA01H3
Professor
Pawel Artymowicz
Lecture
13

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ASTA01 LECTURE NOTES
Ice and Gas formed the outer planets
Rocks and ice formed the inner planets
Random cloud remains outside the outer planets
HL Taury
Planetary formation ongoing
Binary System and Planets are 50-50
HD114762
Some intererting star
Numbers supported earler observations that something was forcing the star to
wobble and deviate from its expected orbit.
Lecture 13 New Horizons and Pluto
This is part of the outer planets test despite not actually being an outer planet encounter.
Re-modelled 5 times because of the cost.
You have to have a purpose built mission to go to pluto.
Got past the moon in 10 hours.
Took 10 years, 2005-2015
Background
Pluto discovered in 1930 by Clyde Tombaugh
He was looking for some kind of disruption in Neptune’s orbit
But that was a miscalculation of the mass of Neptune, which Voyageur fixed.
Pluto is super far and much less in magnitude than Mars is.
Extremely dim
2/3 the diameter of the moon!
Pluto’s telescopic discoveries
14 people
Lowell Observatory Director V. Sliper asked the guy to find it
He found it, using a blink comparator
Telescopic Observations
Variation of every 6.6 days
Rotation
Every 6 days, Charon and pluto would pass beside one or the other for about a
year
Methane
Albedo estimate increased to 13% making pluto much smaller
1980s atmosphere (due to stellar occultations)
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