Download Long-period

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Orrery wikipedia, lookup

Planet Nine wikipedia, lookup

Sample-return mission wikipedia, lookup

Late Heavy Bombardment wikipedia, lookup

Juno (spacecraft) wikipedia, lookup

Exploration of Io wikipedia, lookup

New Horizons wikipedia, lookup

Neptune wikipedia, lookup

Planets in astrology wikipedia, lookup

Jumping-Jupiter scenario wikipedia, lookup

Comet Shoemaker–Levy 9 wikipedia, lookup

Definition of planet wikipedia, lookup

Cassini–Huygens wikipedia, lookup

Exploration of Jupiter wikipedia, lookup

Formation and evolution of the Solar System wikipedia, lookup

Comet wikipedia, lookup

Planets beyond Neptune wikipedia, lookup

Scattered disc wikipedia, lookup

Kuiper belt wikipedia, lookup

Oort cloud wikipedia, lookup

Voyagers (1970s)
• 1800 lbs, dish >12 ft diameter
• data rates ~115,000 bits/sec (twice dial-up!)
• Radioisotope Power Generators
(Covered in the video…)
Galileo Mission (1989-2003)
First detection of
ammonia in the clouds
of Jupiter
Imaged impact by
comet ShoemakerLevy in 1994
Found it likely that
there is a 100-km deep
ocean under the ice of
Studied thunderstorms
On the way,
discovered asteroid
Ida has a moon
Now: In retrograde, rises in
ENE at about 10pm and is 60
degrees up at dawn [Fall 2005]
• Within Roche Limit (3
body problem…)
• < 2km thick
• dust to boulders+
Cassini / Huygens (1997 - ?)
Cassini still orbiting
Saturn, Huygens probe
landed on its moon,
Titan, last January
Many discoveries, nicely
listed in this top-10 list
…Huygens probe will be dropped onto Titan
What will happen?
 Science News
Article, posted
• In Aquarius, magnitude 5.7
“Rotisserie” spin during 84-yr orbit
Close to here now
8th magnitude, in Capricornus
Looks essentially stellar
Neptune’s Moons
• Giant Triton orbits retrograde, spiraling toward
Roche’s limit in 10 – 100 million years
• Nereid smaller with prograde but very eccentric
• Very faint (15th magnitude)
• discovered with 13-inch telescope using
at Lowell by Clyde Tombaugh, by
examining plates with a blink comparator
• Orbit within Neptune’s at times (’80-99)
Pluto and Charon
• One synchronous satellite,
discovered in 1978
Two new moons found with HST
New Horizons Mission
• Launch January, 2006
•Swing by Jupiter in 2007
•Pass by Pluto/Charon 2015, ASAP,
before atmosphere freezes out.
• Kuiper belt by 2026
Farther out: Short-period comets
come from the Kuiper belt
P<200 years
Extends from
Neptune’s orbit
out to about
1000 AU
comets are KB
toward the sun
by the giant
Farther out: Oort Cloud
In 1950 Jan Oort noticed
no comet has been
observed with an orbit
that indicates that it
came from interstellar
there is a strong
tendency for aphelia of
long period comet orbits
to lie at a distance of
about 50,000 AU, and
there is no preferential
direction from which
comets come.
Long-period Comets perturbed in
from Oort Cloud
Speaking of comets…