Homework 8
The Mission to Eliot
Proposal Guide
Due: Tuesday, November 26
Last update: Tuesday, November 26, 3pm
The Proposal:
The mission propsal should be emailed to the
Eliot Mission Coordinator
by the end of Tuesday, November 26. You should include in your proposal:
- The name or acronym for the mission
- The primary target planet for the mission, and possible secondary
target(s)
- Whether it will concentrate on the planet or satellites
- The planned course and closest approach to the target. Some correction on
approach can be made if instructions are given (eg. "measure radius
using angular size and distance, compute Roche limit 2.4 radii, and
approach within 3 planetary radii").
- The scientific goals of the mission and its instruments
- Choose delivery platform: flyby or orbiter
- A list of instruments,
the budget, and the weights of each
- Weight allowance is total of 100kg. Total masses of all components
including platforms, probes, power supplies, etc.
- The maximum budget is now reduced to $75M.
The grant administrators at NASA will
return your proposal for revision if you exceed this! Total the
costs for all components.
- Make sure you have enough power available to run the instruments. If
limited power is available, state when you want it to turn on and off.
- Because of the distance to Eliot, and the long communication delays,
the mission will have to operate in autonomous mode. State any particular
instructions for contingencies or targets of opportunity above the
normal operating instructions provided by the NASA Spacecraft Systems
Operation Team to program into the on-board computer expert system.
- The total budget and weight. Make sure this is $75M , 100 kg or under.
Common Errors and Problems:
- To deploy a micro-rover, you must land it on the planet using a soft
lander.
- To use the soil analyzer/life detection experiments, you must use a
lander or rover/lander. A hard impact probe or atmospheric probe are not
sufficient.
- To use the atmosphere sensor/analyser, you must be able to get into the
atmosphere with an atmospheric probe, hard impact probe, or soft lander.
- The orbiter is equipped with retro-rockets so it can be slowed into
planetary orbit. No gravity assists are needed to slow it down.
- The flyby is ballistic except for small thrusters, so it needs gravity
assist to re-direct its path into closed orbits. It is primarily designed
for a fast flyby on a hyperbolic trajectory.
- Aerobraking and gravity-assist in this unexplored system are very risky.
Use with caution! Missions can often be accomplished without this (use an
orbiter instead of flyby, etc).
- It is a good idea to include at least a Low-Resolution Video Imager
(LRVI) on an orbiter to allow visual selection of a landing site for
a lander or probe! You can choose to deploy blind, but its probably
be best to be careful.
- Choice of landing site can be crucial. A good (but short) set of
instructions and options can make all the difference. The on-board AI
may be able to calculate fast, but it can't think itself out of a paper
bag on its own!
- If you want to communicate with other missions to share intelligence,
data, or telemetry, both missions must include special UHF or VLF comm
gear, and must state this fact in the respective proposals (so common
codes and formats can be agreed upon).
Hints:
It is best to pick an overall planetary and scientific target, like "see if
there is life on Planet X" or "determine internal composition of Planet Y" or
"image satellites of Z". Then make sure your mission does this. Then, see
what else you can put on the mission that will be complementary. Let me know
if you are having troubles with this. Your mission should focus on one or
several questions. Talk it over with your friends and classmates - try and
design complementary and innovative missions! Try and think of missions that
would show us something special. I don't want to see 43 versions of the same
mission :-(
If you want a guide, look at the proposal for
CATS: an example mission.
Of course, don't just copy this one - I would not be happy about that!
I know you would like to make a mission that does "everything", but this
system is set up so that you can only get a good shot at one primary target
planet. With 43 separate missions, no one mission need do everything!
See the list of approved missions
to see what has already been proposed. Some redundancy is OK but try
and do something different.
Keep an eye out for power requirements. Be sure you include a computer
for every 3 instruments! Check to see what you expect the flux from Eliot
to be at the various planets if you want to use solar panels, so you can
decide how many to include. If you want to have probes or landers, then
put most of your instruments on them, instead of the orbiter. Think
of simple instructions to give the on-board AI, like "look for large
satellites, see if they have an atmosphere, if so, drop probe there;
else, drop probe into main planet". Good instructions can make the
difference between an OK mission and a great mission!
If you find the choices too complicated, keep it simple! There is no
single "right" answer, this is exploration.
If you have ideas for other instruments, let me know.
What Comes After:
After Thanksgiving break, I will send you the data that your mission
returns. This might include images, instrument readings, analyzer output,
and maybe some error messages. You will be asked some questions about them
and asked to submit back a short report, which I will post on the Eliot
homepage in the "Mission to Eliot Symposium 2100".
I hope this proves useful and entertaining after all those boring
computations we did. Try and remember what we did and why, and think
of how to use them to find things out about other planetary systems.
Eliot Homepage ---
smyers@nrao.edu
Steven T. Myers