Autor Tema: Rosetta  (Posjeta: 62594 vremena)

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Offline Fire

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« Odgovori #270 u: 21.11.2014. u 00:21:54 sati »
Senzori instrumenta SESAME-CASSE u nogarima Philaea su zabilježili zvuk kontakta sa kometom kod 1. odbijanca. :)
Radi se o vibracijama mehanike i snimak niti na koji način nije mijenjan u smislu duljine trajanja i sadržaja.
https://soundcloud.com/esaops/philae-touchdown-thud

Vizuelna rekonstrukcija timelinea odavajanje Philaea i slijetanja na osnovu dostupnih podataka.
Rosetta je morala napraviti zanimljiv manevar. Vjerovatno da da potrebnu brzinu landeru(?)
Sve je ubrzano 256 puta, a operacije počinju od 39 sekunde videa.

[youtube]http://www.youtube.com/watch?v=qjI7Oerg48I[/youtube]

Offline Fire

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« Odgovori #271 u: 21.11.2014. u 01:22:00 sati »
Phile (i praktično svi znanstveni instrumenti) koristi procesor RTX2010RH koji radi na taktu 5Mhz.
Sav upravljački softver je pisan u Fortu osim jednoga znanstvenog instrumenta koji je pisan u "C"-u.
Sve skupa na landeru se nalazi 9 ovih procesora.

Citat:
Key Features

        Electrically Screened to SMD # 5962-95635
        QML Qualified per MIL-PRF-38535 Requirements
        Fast 125ns Machine Cycle
        1.2µM TSOS4 CMOS/SOS Process
        Total Dose Capability 300KRad(Si)
        Single Event Upset Critical LET >120MeV/mg/cm2
        Single Event Upset Error Rate <1 x 10-10 Errors/Bit-Day (Note)
        -55oC - 125oC, 5V ±10% Operation
        Single Cycle Instruction Execution
        Fast Arithmetic Operations
            Single Cycle 16-Bit Multiply
            Single Cycle 16-Bit Multiply Accumulate
            Single Cycle 32-Bit Barrel Shift
            Hardware Floating Point Support
        C Software Development Environment
        Direct Execution of Fourth Language
        Single Cycle Subroutine Call/Return
        Four Cycle Interrupt Latency
        On-Chip Interrupt Controller
        Three On-Chip 16-Bit Timer/Counters
        Two On-Chip 256 Word Stacks
        ASIC Bus™ for Off-Chip Architecture Extension
        1 Megabyte Total Address Space
        Word and Byte Memory Access
        Fully Static Design - DC to 8MHz Operation
        84 Lead Quad Flat Package or 85 Pin Grid Array
        Third Party Software and Hardware Development Systems NOTE: Single Event Upset error rates are Adams 10% worst case environment under worst case conditions for upset.

Description

The HS-RTX2010RH is a radiation-hardened 16-bit microcontroller with on-chip timers, an interrupt controller, a multiply-accumulator, and a barrel shifter. It is particularly well suited for space craft environments where very high speed control tasks which require arithmetically intensive calculations, including floating point math to be performed in hostile space radiation environments.

This processor incorporates two 256-word stacks with multitasking capabilities, including configurable stack partitioning and over/underflow control.

Instruction execution times of one or two machine cycles are achieved by utilizing a stack oriented, multiple bus architecture. The high performance ASIC Bus, which is unique to the RTX product, provides for extension of the microcontroller architecture using off-chip hardware and application specific I/O devices.

RTX Microcontrollers support the C and Forth programming languages. The advantages of this product are further enhanced through third party hardware and software support. Combined, these features make the HS-RTX2010RH an extremely powerful processor serving numerous applications in high performance space systems. The HS-RTX2010RH has been designed for harsh space radiation environments and features outstanding Single Event Upset (SEU) resistance and excellent total dose response.

Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed here must be used when ordering.

Detailed Electrical Specifications for these devices are contained in SMD 5962-95635. A "hot-link" is provided on our homepage for downloading.
www.intersil.com/spacedefense/space.asp
Applications

        Space Systems Embedded Control
        Digital Filtering
        Image Processing
        Scientific Instrumentation
        Optical Systems
        Control Systems
        Attitude/Orbital Control


Offline galileo

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« Odgovori #272 u: 03.12.2014. u 21:36:23 sati »
Evo još nekih objašnjenja spuštanja lendera na jezgru kometa:

https://blogs.tu-braunschweig.de/presseinformationen/?p=7684

Rosetta-Mission: The incredible flight of the lander »Philae«
Data of the „ROMAP“-Magentometer aids in reconstruction of flight path

At a Rosetta landing event at Tu Braunschweig the 400 guests were elated to hear that the Rosetta lander „Philae“ touched down on a comet as planned. But soon after it was clear that the mission was not continuing as expected, because the lander bounced off the surface. The international team of scientists lead by geophysicist Dr. Hans-Ulrich Auster from the Institut für Geophysik und extraterrestische Physik was working at the „Philae“ control center at that time and followed the incredible flight of the lander. The data obtained by the ROMAP magnetometer from Braunschweig immediatly showed the signatures of this bouncing and the subsequent touchdowns. With the data, the movement on the comet can be reconstructed.

Bounce: two hours above the comet
 In the evening of 12th November, 2014, the scientists around Dr. Hans-Ulrich Auster were surprised when they saw the data of the ROMAP magnetometer immediately after touchdown: „With the magnetometer we can reconstuct the movement of the lander, just like the rotation of a compass needle. Consequently we could see instantly that „Philae“ bounced off the surface and finally returned after two hours. After evaluating our data we now have more information on the path to the final and still unknown landing site“ explained Dr. Auster.

Possible collision with a crater rim
 Now the magnetic field data reveals that after the first touchdown „Philae“ started to rotate about its vertical axis, says Auster. The reason was that the reaction wheel, that was stabilizing the lander during descend, transferred its momentum to the freely moving lander. Within 40 minutes Philae accelerated to a rotational velocity of about 5 rpm, which is comparable to a wind turbine at low wind speeds“ says the geophysicist. But after 45 minutes the pattern changed suddenly: „The rotational velocity decreased to half the original speed, the axis tilted and the lander began to tumble. Most likely the reason was a collision with a crater rim“ summarized Dr. Auster.

Second landing decides Philae’s fate
 The magnetometer from Braunschweig shows that the lander tumbled above the surface for another hour before it jarringly touched down for the second time. „Then the fate of the lander was decided, which was also visible in magnetic field signatures. After first grazing the surface, „Philae“ landed on its feet at the last moment. After another seven minute bounce the lander arrived at its final position surrounded by icy walls“ say Hans-Ulrich Auster. „Although there was some luck involved, the astonishing landing impressively demonstrated that the lander was sturdy enough to not only withstand the harsh environmental conditions of space but also managed to survive this arduous landing sequence.”

ROMAP-Instrument
 The Rosetta Lander Magnetometer and Plasma Monitor (ROMAP) is one of ten instruments on the lander „Philae“, that investigates the magnetic field and solar wind parameters of the comet 67P/Churyumov-Gerasimenko for the ESA Mission Rosetta. Lead by Dr. Hans-Ulrich Auster of the Institut für Geophysik und extraterrestrische Physik at Technische Universität Braunschweig scientists from the Energy Research center in Budapest, the Institut für Weltraumforschung Graz in Austria and the Max-Planck Institut für Sonnensystemforschung in Göttingen contribute.

 

Contact
 Dr. Hans-Ulrich Auster
 Institut für Geophysik und extraterrestrische Physik
 Technische Universität Braunschweig
 Mendelssohnstraße 3
 38106 Braunschweig
 Tel.: 0531 391-5241
 E-Mail: uli.auster@tu-braunschweig.de
 www.igep.tu-bs.de

Ivica Skokić: SUNČANI SATOVI U HRVATSKOJ
http://www.celestialscenes.com/sundials/index.php?location=Home

Offline Zocky

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« Odgovori #273 u: 14.12.2014. u 21:35:48 sati »
Nakon analize, pokazalo se da je "voda" na kometi 67P/C-G poprilično drugačijeg sastava nego voda na Zemlji.
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Offline galileo

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« Odgovori #274 u: 16.12.2014. u 07:27:31 sati »
Ovako bi jezgru kometa vidjelo ljudsko oko.
http://blogs.esa.int/rosetta/2014/12/12/comet-67pc-g-in-living-colour/

Nije neka raskoš u bojama, al' neka...   :kokice:
Ivica Skokić: SUNČANI SATOVI U HRVATSKOJ
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Offline Todor

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« Odgovori #275 u: 16.12.2014. u 09:03:08 sati »
Kao Mjesec.
Sjećam se kad je Duke na predavanju opisivao Mjesec kao nevjerojatno siv.
Trolor

Offline Acheron

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« Odgovori #276 u: 16.12.2014. u 09:31:11 sati »
Mene podjeća više na cement, imam mi baš tu boju

Offline galileo

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« Odgovori #277 u: 26.12.2014. u 19:24:49 sati »
Britanski astronom amater Stuart Atkinson poigrao se fotkom koju je snimila Rosetta i napisao priču o 1km visokoj stijeni - klifu.
Poanta je "u skoku" s tog vrha "visokog 1km" - paaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaadaš i ostaneš živ...  :218: http://www.telegraph.co.uk/news/science/space/11311481/Rosetta-images-show-soaring-1km-comet-cliff.html
« Zadnja izmjena: 26.12.2014. u 19:36:45 sati od galileo »
Ivica Skokić: SUNČANI SATOVI U HRVATSKOJ
http://www.celestialscenes.com/sundials/index.php?location=Home

Offline Zocky

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« Odgovori #278 u: 16.01.2015. u 17:40:48 sati »
Zadivljujuće koliko ESA-i treba da objavi fotke.
Ova fotka "kipuće jezgre" snimljena je još 22.11. prošle godine.


Comet 67P activity – 22 November 2014 - OSIRIS by europeanspaceagency, on Flickr
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Offline Šegi

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« Odgovori #279 u: 16.01.2015. u 18:38:02 sati »
Jaako zanimljivo... iz ovog bi se moglo zaključit da je "vrat" duže izložen zračenju Sunca uslijed geometrije osi rotacije.
Ako je tako, onda je "vrat" vrlo vjerojatno tako i nastao...