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Questions tagged [cassini]

Questions related to the Cassini–Huygens spacecraft sent to Saturn.

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9
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1answer
301 views

What force is bringing Cassini down into Saturn's atmosphere in another 145 days; drag, or…?

Headlines suggest (as do their articles) that as a gravitational result of Cassini's final flyby of Titan, it's fate is sealed and it's orbit is destined to take it into Saturn's atmosphere on ...
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Unravelling Cassini's “ball of yarn” orbit around Saturn, tabulation of propulsive maneuvers?

The cool GIF on the NASA JPL Cassini resources page All Orbits (2004-2017): The Ball of Yarn is quite beautiful to look at, but it also hints at some beautiful engineering and orbital mechanics as ...
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Flying fuel tanks! Which deep-space spacecraft had the largest fuel mass fraction?

The Los Angeles Times' Deborah Netburn just wrote a really nice retrospective; ‘OK. Let’s do it!’ An oral history of how NASA’s Cassini mission to Saturn came to be with plenty of photos and quotes ...
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Is Cassini's 183rd burn; some kind of engine record?

I've just read that when Cassini makes its first close pass of Saturn's F-ring on December 4, it will be the 183rd engine burn which sounds like a lot for orbital maneuvers using a spacecraft's main ...
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If Cassini's final flyby of Saturn's moon Titan is the 127th Titan flyby, why is it called “T-126”?

Cassini's final flyby of Titan in April 2017 sealed it's fate in September of that year. This is described further in answers to What force is bringing Cassini down into Saturn's atmosphere in another ...
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2answers
535 views

Does Cassini have one or two identical main engines - if two, how does that work?

I just read that when Cassini makes it's first close pass of Saturn's F-ring on December 4, it will be the 183rd time the engine fires. I googled Cassini's engine and found this site which has a cool ...
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Does the Apollo 10 “music” still occur on modern spacecraft?

In the news today, are reports of "outer-space-type music" that the Apollo 10 crew heard. From the mission transcript (page 197 of the PDF): ...
6
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1answer
304 views

What is the nature of a “flux tube” between Saturn and Enceladus, and what does “L‐shell=4” mean?

The NASA JPL YouTube video Sounds of Saturn: Hear Radio Emissions of the Planet and Its Moon Enceladus (below, also here) provides and audio and spectral representation of plasma waves recored by ...
4
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1answer
333 views

Why are there so many waveguide feeds (?) near the focus of Cassini's dish antenna?

Cassini has quite a complex Radio Science Subsystem. Accorting to that article (and confirmed in Wikipedia): Cassini is the only deep space mission to transmit to Earth at three radio wavelengths (...
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Why are we concerned about Cassini contaminating Saturn's moons when we landed Huygens probe on one of them?

Cassini is scheduled to crash land into Saturn later in 2017. The reason stated was that they did not want to risk contaminating any of Saturn's moons. However, during the Cassini mission, we landed ...
7
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Why would Cassini need to reach 64 degrees inclination before “threading the needle”?

The NY Times article Cassini’s Final Mission: Obliteration says that the Cassini spacecraft will end it's more than a decade long exploration of the Saturn system by raising the inclination of its ...
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Cassini: difference between trajectory and orbital trim maneuvers in this list?

I found this site with quite a substantial amount of data, tabulations, and more for many space exploration missions. There are detailed information on the Cassini mission here: http://www.dmuller....
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Is Cassini equipped for detection of non-water-based exobiology?

Looking at one of the latest images of Titan's north pole as taken by Cassini probe made me curious how well equipped this NASA's probe actually is to detect non-water-based exobiology?   &...
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3answers
883 views

What does flying in Enceladus's plume accomplish?

I've been having a hard time understanding what flying through Enceladus's plume accomplishes. Cassini is an orbiter. It seems odd that it would have instruments that could even analyze the plume at ...
9
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321 views

Did Huygens take a picture of Cassini?

In reference to a question about pictures of Cassini, I stated that it was possible that Huygens could have tested out its camera immediately after separation by taking a picture of Cassini. Was ...
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2answers
344 views

How (the heck) do they know some lakes on Titan are 100 meters deep?

JPL News item NASA's Cassini Reveals Surprises with Titan's Lakes NASA's Solar System Dynamics New item Cassini Reveals Surprises with Titan's Lakes point out that some lakes on Titan have been ...
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Is Cassini running out of fuel?

In their (misleadingly titled) article NASA's Cassini probe dives into Saturn's atmosphere, CNN reports Once the final five orbits are complete, Cassini will plunge towards Saturn, with seven ...
5
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1answer
143 views

Why did Cassini have reaction wheels but Galileo, Juno and New Horizons don't?

Three gas giant planet orbiters are mentioned in this answer: Cassini - Uses Reaction Wheels and thrusters Galileo - Primarily managed via spinning the spacecraft and thrusters. Juno - Just ...
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Delta-v obtained from Titan by the Cassini spacecraft; just how much of a “gas tank” was it?

In the video Cassini at Titan: A World Unveiled after about 01:56 Linda Spilker, Cassini Project Scientist, Jet Propulsion Laboratory says: Not only was Titan ...
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Are there both “lake” and “sea” designations on Titan? Officially or otherwise?

@TomSpilker's excellent answer to How (the heck) do they know some lakes on Titan are 100 meters deep? says at the very end: As far as the lakes (smaller than the seas) go, as the sources you cite ...
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Where to get Cassini VIMS data and optical transmission spectra of Titan's atmosphere?

In the extensive 2010 paper HYDROCARBON DEPOSITS ON TITAN by Clark et al. there are two plots that show Titan's atmospheric transmission windows. These plots (Figures 1 and 5) can be used to indicate ...
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How will the Cassini spacecraft help constrain the mass of Saturn's rings?

In the BBC news article To see finally the face of Peggy (Peggy is a very small moonlet interacting with a ring) there is an audio interview with Carl Murray of Queen Mary University of London. After ...