*On the left: the BepiColombo spacecraft, the MORE - Mercury Orbiter Radioscience Experiment - logo and team. BepiColombo is an ESA mission dedicated to the exploratcion of Mercury. Launch: 2014.*

Dear Students,

June 29 exams session has been removed from Infostud. It is not possible to schedule other exams in June after Friday 12.) The students who already signed up for that session may take the exam on other dates in July. The earliest opportunity is July 6-8. I may schedule one or two additional exam days in July. Should you wish to take advantage of this opportunity, please email me.

Luciano Iess

Students admitted to the exams in simplified mode must have a "yes" in the last column.

**Click here to download the test**

The solution (a pdf file) and the source code must be emailed by Sunday May 31 23:59 UTC to luciano.iess@uniroma1.it AND mircojunior.mariani@uniroma1.it. NO EXCEPTIONS!

Suggestions and remarks: Be concise and go right to the point. Plots convey information very effectively. Including a working source code is mandatory.

Tuesday's lecture has been moved to Monday (May 25) at 12:00 pm

Due to the visit to Avio, Friday's lecture will be moved to Thursday at 15:45. We will present an example of attitude control, helpful in the solution of the second home test.

**The second home test will be published on this web site ***Wednesday*** afternoon at 3 pm. **

**Deadline for submission is Sunday at 23:59 UTC.**

**MSS 2105 Challenge - Winners:**

- Gaeta 3 pt

- Di Ruscio 2 pt

- Panicucci 2 pt

Congratulations to all participants (34)!

Caputo, Iovallo, Mangionami, Moriero, Palombi, Pica, and Piermarini passed the test.

MSS 2015 Challenge (this is a new file specifying some missing units - 4:46 pm May 8).

If you have questions, Paolo Racioppa (06 44585976) and/or I will be available till 7 pm, today, May 8. Good luck to all participants!

Clarifications (we will try to put all of them online):

1) h is the altitude above the surface.

2) You are free to take the atmosphere as non-rotating. This leads to a minor simplification of the problem. In general, when some information is not provided, make reasonable assumptions.

Matlab code for the coherent demodulator

Suggestions and remarks: Be concise and go right to the point. Plots convey information very effectively. Including a working source code is mandatory.

**___________________________________________________________ **

**MSS 2014 - Home test n. 2 **

Email the code and the report to luciano.iess@uniroma1.it AND mircojunior.mariani@uniroma1.it by Friday May 30 23:59:59.

Students passing both home tests (or the challenge and the second test) will be entitled to take the exam in a simplified mode.

**Clarification #1**: you may neglect the torque variations due to the eclipses.

**Clarification #2**: if needed, you may use this matlab routine to solve Kepler's equation.

**Clarification #3**: The angular momentum storage capacity is 29.32 N-m-s and not 22.6 N-m-s.

**Clarification #4**: The minimum time requirement has to be intended loosely. Any design of the control system attaining the required attitude in a reasonable time is acceptable.

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** **** **

***** Challenge MSS 2014 - Results**

- Mario Tindaro Migliorino - 2 pt.

- Michela Archi - 1 pt.

- Renato Volpe - 1 pt.

- Filippo Silvestrucci - 1 pt.

- Andrea Antolino - 1 pt.

Congratulations to all participants. The solution will be presented on Monday May 19, 1:30 pm, at the Radio Science Lab.

** **

**- Tuesday May 13, 8:30-10:00 am, room 39**

**- Wednesday May 13, 12:00-1:30 pm, room 39**

**- Thursday May 13, 10:15-11:45 am, room ********* 39 **********

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** **

**Challenge MSS 2014 ****WARNING (May 9, h.19:30) : The first guess value of the GM must be set to 401500 km3/s2 and not to 398500 km3/s2 as reported in the text of the challenge. ******

**Observables: t****rack_GS1.txt t****rack_GS2.txt**

**Email the code and the report to luciano.iess@uniroma1.it AND paolo.racioppa@uniroma1.it by Sunday May 11 23:59:59 UTC.**

Students who did not pass the first test can take part in the challenge. The challenge is valid as a backup test. The deadline is unchanged (no extension this time).

** **

**Home Test 1 (revised) (students passing both tests are eligible to take the final exam in a simplified mode)**

**Observable quantities (trackfile.txt) **

***** Email the code (Matlab, Fortran, C ...) and a short note containing the procedure, the solution and the plots to luciano.iess@uniroma1.it AND paolo.racioppa@uniroma1.it by midnight Sunday Apr. 27, 2014. **

***** Updated List of received reports by midnight Sunday Apr. 27, 2014 *****

List of Received Reports (Updated)

***** Home Test 1 Results *****

Students who did not pass the first test can take part in the challenge. The challenge is valid as a backup test.

** **

**** Follow the link on the side to know the dates of examination sessions.**

**** Dates of home tests and competition:**

** **- Apr. 23-27 (home test 1)

- May. 20-24 (home test 2)

- May 9-11 (competition)

** **

**** Space Environment and Instrumentation**: The updated class notes

- Space_Env_Instr_2014_1.pdf

- Space_Env_Instr_2014_2.pdf

- phase_amplitude.m (matlab file)

- quadrupole_eig.m (matlab file)

may be downloaded from the link Class Notes.

**** Space Missions and Systems**: The updated class notes

- Missioni_Sist_Spa_0_2014.pdf

- Missioni_Sist_Spa_1_2014.pdf

- Missioni_Sist_Spa_2_2014.pdf (only minor typos corrected)

- Missioni_Sist_Spa_3_2014.pdf (some typos corrected)

may be downloaded from the link Class Notes. Please consider also the auxiliary slides Normal_Distributions.pdf.

**For updated information you may follow me on Twitter** (luciano_iess)

Seminar 1: Deep Space Navigation Systems: Where Do We Stand?

Seminar 2: The European Delta-DOR Correlator

Seminar 3: BepiColombo, the ESA Mission To Mercury; MORE: Geodesy, Geophysics, Navigation

Seminar 4 and 5: The Scientific Use of Deep Space Tracking Systems; Radio Science in Deep Space Missions

*****Tour of Robledo's DNS facilities.** The visit to the Robledo and Cebreros tracking complexes was an interesting and profitable experience for all of us. Follow the link to see some photos.

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Relativity in the Global positioning System by N. Ashby

*Storm on Saturn's North pole*