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EFossa
2004-Jul-01, 11:20 PM
Does anyone know what time the distant Titan Flyby occurs?

Also, is the "Where is Cassini now" website not working for othere users too?

http://saturn.jpl.nasa.gov/operations/present-position.cfm

The day before SOI it was updating about every 15 minutes then it stopped at 02:30 UTC then went backwards lol. Is there another source of this information?

PeteB
2004-Jul-02, 01:29 AM
Does anyone know what time the distant Titan Flyby occurs?

Closest approach is at 10:54 UTC but the encounter starts about 9 hours before that. All data should be played back by 23:00


Also, is the "Where is Cassini now" website not working for othere users too?

http://saturn.jpl.nasa.gov/operations/present-position.cfm

The day before SOI it was updating about every 15 minutes then it stopped at 02:30 UTC then went backwards lol. Is there another source of this information?

Yesterday I discovered that going to http://saturn1.jpl.nasa.gov/operations/present-position.cfm instead of http://saturn.jpl.nasa.gov/operations/present-position.cfm gets to the display that is being updated.

umop ap!sdn
2004-Jul-04, 08:01 AM
Related question: is it possible to get the Horizons system to produce Saturn-centered orbital elements for the spacecraft? I tried several times specifying Saturn or the Saturn barycenter as the central object, but it wouldn't accept either one. :-k

Manchurian Taikonaut
2004-Jul-04, 10:05 AM
Does anyone know what time the distant Titan Flyby occurs?

"Where is Cassini now"

...

The day before SOI it was updating about every 15 minutes then it stopped at 02:30 UTC then went backwards lol. Is there another source of this information?

Yes, the Cassini-Huygens is a NASA ESA mission so the Euros have some information on their website also.
Check out the European web page

:)

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

cool pic of Titan

:D

http://www.esa.int/images/0a0006561lrge.jpg




they have a flash animation, so you can select an event, play and rewind what' happening and check its current position

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

hedin
2004-Jul-04, 11:14 AM
peteB and Taikonaut thx for the great links :D

RGClark
2004-Jul-04, 12:55 PM
Yes, the Cassini-Huygens is a NASA ESA mission so the Euros have some information on their website also.
Check out the European web page

:)

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

cool pic of Titan

:D

http://www.esa.int/images/0a0006561lrge.jpg




they have a flash animation, so you can select an event, play and rewind what' happening and check its current position

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

Thanks for the links. The flash animation seems to suggest the next close flyby of Saturn or Titan won't be until October.
Is this right?


Bob C.

hedin
2004-Jul-04, 03:10 PM
Yes, the Cassini-Huygens is a NASA ESA mission so the Euros have some information on their website also.
Check out the European web page

:)

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

cool pic of Titan

:D

http://www.esa.int/images/0a0006561lrge.jpg




they have a flash animation, so you can select an event, play and rewind what' happening and check its current position

http://www.esa.int/SPECIALS/Cassini-Huygens/SEMD6E2VQUD_0.html

Thanks for the links. The flash animation seems to suggest the next close flyby of Saturn or Titan won't be until October.
Is this right?


Bob C.

Thats right Bob C. october 26th when Cassini will get as close as 1200 km to Titan. HereŽa list of all close encounters. http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34962

PeteB
2004-Jul-05, 04:11 AM
hedin -

Here's an addition to the ESA list of encounters. These are the rest of the major icy satellite encounters at < 100,000 km.

I can also post a list of the encounters with the inner small satellites if it would be useful.


Dione 15 December 2004 81,425 km
Tethys 9 March 2005 82,975
Tethys 2 May 2005 64,990
Mimas 15 April 2005 77,233
Enceladus 12 October 2005 42,635
Enceladus 24 December 2005 97,169
Enceladus 9 September 2006 39,842
Enceladus 12 November 2006 94,410
Dione 21 November 2006 72,293
Tethys 26 May 2007 97,131
Mimas 27 June 89,730
Tethys 29 August 2007 48,324
Dione 30 September 2007 56,523
Rhea 16 November 2007 78,360
Mimas 3 December 2007 79,272
Mimas 11 April 2008 95,428
Enceladus 30 June 2008 99,092

ToSeek
2004-Jul-05, 10:23 PM
Cassini Provides New Views of Titan, Saturn's Largest Moon

The Cassini spacecraft has revealed surface details of Saturn's moon Titan and imaged a huge cloud of gas surrounding the planet-sized moon.



Cassini gathered data before and during a distant flyby of the orange moon yesterday. Titan's dense atmosphere is opaque at most wavelengths, but the spacecraft captured some surface details, including a possible crater, through wavelengths in which the atmosphere is clear.



"Although the initial images appear bland and hard to interpret, we're happy to report that, with a combination of instruments, we have indeed seen Titan's surface with unprecedented clarity. We also look forward to future, much closer flybys and use of radar for much greater levels of surface detail," said Dr. Dennis Matson of NASA's Jet Propulsion Laboratory, Pasadena, Calif., project scientist for the international Cassini-Huygens mission.



Cassini's visible and infrared mapping spectrometer pierced the smog that enshrouds Titan. This instrument, capable of mapping mineral and chemical features of the moon, reveals an exotic surface bearing a variety of materials in the south and a circular feature that may be a crater in the north. Near-infrared colors, some three times redder than the human eye can see, reveal the surface with unusual clarity.



"At some wavelengths, we see dark regions of relatively pure water ice and brighter regions with a much higher amount of non-ice materials, such as simple hydrocarbons. This is different from what we expected. It's preliminary, but it may change the way we interpret light and dark areas on Titan," said JPL's Dr. Kevin Baines, Cassini science-team member. "A methane cloud is visible near the south pole. It's made of unusually large particles compared to the typical haze particles surrounding the moon, suggesting a dynamically active atmosphere there."



This is the first time scientists are able to map the mineralogy of Titan. Using hundreds of wavelengths, many of which have never been used in Titan imaging before, they are creating a global map showing distributions of hydrocarbon-rich regions and areas of icy material.



Cassini's camera also sees through the haze in some wavelengths. "We're seeing a totally alien surface," said Dr. Elizabeth Turtle of the University of Arizona, Tucson. "There are linear features, circular features, curvilinear features. These suggest geologic activity on Titan, but we really don't know how to interpret them yet. We've got some exciting work cut out for us."



Since entering orbit, Cassini has also provided the first view of a vast swarm of hydrogen molecules surrounding Titan well beyond the top of Titan's atmosphere. Cassini's magnetospheric imaging instrument, first of its kind on any interplanetary mission, provided images of the huge cloud sweeping along with Titan in orbit around Saturn.*The cloud is so big that Saturn and its rings would fit within it. "The top of Titan's atmosphere is being bombarded by highly energetic particles in Saturn's radiation belts, and that is knocking away this neutral gas," said Dr. Stamatios Krimigis of Johns Hopkins Applied Physics Laboratory, Laurel, Md., principal investigator for the magnetospheric imager.*"In effect, Titan is gradually losing material from the top of its atmosphere, and that material is being dragged around Saturn."



The study of Titan, Saturn's largest moon, is one of the major goals of the Cassini-Huygens mission. Titan may preserve in deep-freeze many chemical compounds that preceded life on Earth. Friday's flyby at a closest distance of 339,000 kilometers (210,600 miles) provided Cassini's best look at Titan so far, but over the next four years, the orbiter will execute 45 Titan flybys as close as approximately 950 kilometers (590 miles). This will permit high-resolution mapping of the moon’s surface with an imaging radar instrument, which can see through the opaque haze of Titan's upper atmosphere. In January 2005, the Huygens probe that is now attached to Cassini will descend through Titan's atmosphere to the surface.



During the ring plane crossing, the radio and plasma wave science instrument on Cassini measured little puffs of plasma produced by dust impacts. While crossing the plane of Saturn's rings, the instrument detected up to 680 dust hits per second. "The particles are comparable in size to particles in cigarette smoke," said Dr. Don Gurnett of the University of Iowa, Iowa City, principal investigator for the instrument. "When we crossed the ring plane, we had roughly 100,000 total dust hits to the spacecraft in less than five minutes. We converted these into audible sounds that resemble hail hitting a tin roof."



The spacecraft reported no unusual activity due to the hits and performed flawlessly, successfully going into orbit around Saturn on June 30. The engine burn for entering orbit went so well that mission managers have decided to forgo an orbital-adjustment maneuver scheduled for today.



The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Office of Space Science, Washington, D.C. JPL designed, developed and assembled the Cassini orbiter.

For the latest images and more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini.

-end-

ToSeek
2004-Jul-06, 04:20 PM
Cassini photos thrill, mystify scientists (http://www.spaceflightnow.com/cassini/040703titanpix.html)


New pictures of Saturn's enigmatic moon Titan, taken by cameras aboard the Cassini probe that are capable of penetrating the thick smog-like haze that blankets the frigid world, show strange looking surface features and a deck of methane clouds the size of Arizona. But so far, the instruments have not detected reflections from the surfaces of lakes or small seas of liquid hydrocarbons many scientists believe must form in the ultra-cold environment.