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Author Topic: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!  (Read 6860 times)

Offline ArMaP

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Re: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!
« Reply #75 on: April 28, 2017, 06:07:34 AM »
A different eccentricity? Lateral movement as opposed to vertical?
Yes, orbit eccentricity is the shape of the orbit. A non-eccentric orbit is a perfect circle, the less circle-like and more ellipse-like the orbit is the more eccentric it is. The Earth's orbit has an eccentricity of 0.0167, Callisto 0.0074, so the Earth's orbit is more eccentric than Callisto's.

Offline ArMaP

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Re: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!
« Reply #76 on: April 28, 2017, 06:13:51 AM »
Anyone know of the Nasa contact or comment page for the Juno mission?

Someone needs to ask them directly if Callisto is jumping around or if their imagery just plain sucks.

Diplomatically of course.  ;)
I tried three different emails, one for Malin (the camera makers), and two for the JunoCam Principal Investigators, and today I got an answer from one of the Principal Investigators, Dr. Candice Hansen:

Quote
It just had to do with the frequency of our images.  Also, Callisto was borderline to detect so occasionally it didn't show up.

It sounds like she isn't sure. :)

Offline The Seeker

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Re: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!
« Reply #77 on: April 28, 2017, 07:11:41 PM »

Anyone know of the Nasa contact or comment page for the Juno mission?

Someone needs to ask them directly if Callisto is jumping around or if their imagery just plain sucks.

Diplomatically of course.  ;)
Appears to me that Callisto is hopping around, and yes, their imagery sucks like a Dyson  ;D

After all, we are talking about Never A Straight Answer...

Seeker
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Offline A51Watcher

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Re: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!
« Reply #78 on: April 28, 2017, 07:49:24 PM »
Appears to me that Callisto is hopping around, and yes, their imagery sucks like a Dyson  ;D

After all, we are talking about Never A Straight Answer...

Seeker

I don't doubt that Nasa could cheap out and use a sh!t camera.

After all it's only a Billion dollar probe flying a Billion miles away why not save a few dollars on the camera?

It's using a wide angle lens, who knows what make model and manufacturer.

But the occurrence in all quadrants while the other objects do not, makes this low on the plausibility scale.

Sure Callisto is dimmer than the other moons but so what?

What kind of crap lens would move a low light pixel around?

And now one of the project managers doesn't even know what we're talking about.  ::)

Wow these scientists and astronomers sure are keeping fastidious records of these orbits as alleged.  :-X

 
« Last Edit: April 28, 2017, 07:54:01 PM by A51Watcher »

Offline ArMaP

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Re: Breaking News!! - Juno Probe sends back first home movies of Jupiter!!
« Reply #79 on: April 29, 2017, 07:18:42 AM »
I don't doubt that Nasa could cheap out and use a sh!t camera.
JunoCam is a "public outreach" instrument, not a scientific instrument.

As they say here:

Quote
The scientific themes of the Juno mission are to study the interior, atmosphere, and magnetosphere of Jupiter (Bolton et al., this issue). The spacecraft has been highly optimized for the operation of its seven science instruments, leading to a solar-powered, sun-pointing, spinning design. Such a platform presents challenges for imaging, both from motion blur and pointing geometry. But it was appreciated that visible imaging is an important component of public engagement for any mission. So a visible camera, Junocam, was included primarily for education and public outreach (EPO), funded from the mission’s EPO budget
and given a fairly constrained allocation of spacecraft mass resources

Offline ArMaP

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I got an answer to my first email, to Malin Space Science Systems.

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There are two reasons.  First, Callisto is the dimmest of the large satellites of Jupiter and so is less obvious in some images than the others.  But more importantly, Junocam takes images in relatively narrow strips.  For the Jupiter approach movie, we had to take a full 360 degree swath of sky because we could not predict in advance where Jupiter would be as the spacecraft spun.  To simplify processing, we used computer vision software to locate Jupiter in each swath and all further processing was done with the single image strip that contained Jupiter (one strip each for red, green, and blue).  Depending on the geometry, sometimes Callisto did not appear in the same strip as Jupiter in one or more colors, and in some cases, in none of them.  In the final movie, this resulted in Callisto seeming to twinkle or become invisible, but this was not a real effect.  If we went back to reprocess the original raw data, we could track Callisto across multiple strips, and perhaps some amateur will do this once the data are released to the Planetary Data System.

This is distinct from the moons actually disappearing and reappearing as they enter and leave the shadow of Jupiter (they're still there, of course, but too dark to see.)  This can be seen many times for Io, Europa, and Ganymede, but I don't believe this happened for Callisto during the approach period.

Regards,

Malin Space Science Systems - Juno Team=

Offline The Seeker

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I got an answer to my first email, to Malin Space Science Systems.
But they did not address the vertical movement of Callisto, just it winking in and out...

Seeker
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Trolls are crunchy and good with ketchup...
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