Ekipa, kakve HST ima mehanizme usmjeravanja? Kako ga se uspije drzati usmjerenog u jednu tocku tako precizno?
Da li HST ima pokretnih mehanizama? Ako ima, onda se kod pomicanja bilo cega cijeloga treba opet smiriti.
Ja baš bio htio pitati jeli to netko zna
dok nisam poslušao zadnju Andromedu...nešto A.Radonić to razjašnjavao oko žiroskopa na Hubbleu.
Andromeda 19.5.2009. - I dioAndromeda 19.5.2009. - II dioNešto sam tražio pa našao ovo;
Znači koliko vidim žiroskopi rotiraju teleskop na osnovu podataka dobivenih iz senzora za fino navođenje.
Kako to radi opisano je u ovom linku;
http://www.astronomy.com/asy/default.aspx?c=a&id=3477Gyros, the heart of Hubble's pointing control system, sense the telescope's motion in each of three dimensions. They also provide Hubble with information about its location in space so it can slew across the sky from one target to another.
Some of this information is missing when running with only two gyros. For slewing, Hubble will use either its onboard magnetometers, which sense the telescope's position relative to Earth's magnetic field, or its Fixed Head Star Trackers (FHST). While the FHSTs provide more accurate information than the magnetometers, there are times when Earth blocks star fields they might need. The magnetometers work all the time but result in pointing errors as great as 10º.
Once the FHSTs can see stars, Hubble's computer compares their images to its star map and corrects where it's pointing. Then, the telescope's Fine Guidance Sensors (FGS) acquire the guide stars needed to center the target in the instrument's field-of-view. Once that happens, FGS information replaces that from the FHSTs, enabling Hubble to study its target.
Ovdje ima također detalja o samim žiroskopima.
--->po 2 u kućištu RSU
Baš sa RSU3 je bilo problema kod servisa Hubllea neki dan.
http://www.zvjezdarnica.com/forum/index.php?topic=2468.msg54233#msg54233Sklop unutar žiroskopa se rotira u nekakvom fluidu sa brzinom od 19.200 okretaja/min na plinskim ležajevima. Strujom se napaja preko voda debljine ljudske kose...zanimljiv komad hardvera.
http://www.gsfc.nasa.gov/gsfc/service/gallery/fact_sheets/spacesci/hst3-01/gyros.htmHow do gyros work?
The gyros work by a scientific principal called the gyroscopic effect. This effect can be demonstrated by holding a bicycle wheel by the axle and asking someone to spin the tire. If you try to move the axle of the spinning wheel, you would feel a movement in a direction different from the way you were attempting to move it. This movement is similar to the way the gyros move when Hubble moves.
The gyroscopic movement is achieved by a wheel inside each gyro that spins at a constant rate of 19,200 rpm on gas bearings. This wheel is mounted in a sealed cylinder, which floats in a thick fluid. Electricity is carried to the motor by thin wires (approximately the size of a human hair) which are immersed in the fluid. Electronics within the gyro detect very small movements of the axis of the wheel and communicate this information to Hubble’s central computer.
The gyros are extraordinarily stable and can detect extremely small movements of the Telescope. The gyros are the most accurate in the world and, combined with other fine pointing devices, keep HST pointing for long periods of time to collect spectacular images of very faint galaxies, planets and stars not visible from Earth.
Ovo bi bio dio neba koji Hubble vidi u ovisnosti o broju ispravnih žiroskopa;
To bi bilo to, a da skroz razumijem mehaniku kako to sve skupa radi nebih mogao reći.
Vidimo se na novom AstroForumu! 
