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Juno perijove 4, February 2, 2017
Gerald
post Jan 20 2017, 11:16 PM
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It's time to open a perijove-4 thread.
Voting is open for another two days. So, don't hesitate too long.
Besides the discussion and the POIs on the mission page, you might consider John Roger's detailed discussion of several interesting features.

If everything goes well, all instruments will be switched on.

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Bjorn Jonsson
post Mar 7 2017, 12:24 AM
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Now at last I took the time to finish the Juno-related software development I started around the time of the Juno Earth flyby back in 2013. Now I can reproject the raw framelets to simple cylindrical projection and render the resulting maps, resulting in nice images.

Here is a test image. This is image 119 ("radiation trend monitoring"). It was obtained on February 2, 2017 when Juno was ~340,000 km from Jupiter's center on the outbound leg of its trajectory. I selected this image because it's a global image where limb fits are trivial - this makes debugging stuff easier.

Attached Image
Attached Image


The left version is the image with almost no processing except for color correction and some sharpening. In the right version global illumination has been removed using a modified Lommel-Seeliger function and the contrast greatly exaggerated. In the original images the area near Jupiter's right limb is saturated in the red and green channels, resulting in very low contrast and slightly strange color. Interestingly, the saturated value in the original raw images is 240.

The contrast is rather low. I suspect I need to add square root encoding to the processing to increase the contrast; I noticed that Gerald does this.

One thing that caused me some minor headaches was a part the SPICE instrument kernel file, specifically this section:

CODE
      --- 0,0---------------------|----------------------.      | 230 pixels
  4.94 deg | RED     128 pix      *                      |     --------
      ---  `----------------------|------------------1600,128
                                  |
                                  V +Yjc

           |                   61.69 deg                 |      Boresight
           |---------------------------------------------|    (+Zjc axis)
           |                                             |      is into
                                                                the page


Maybe I'm missing something elementary but the value 61.69 deg seems strange and I get weird results if I use it. However, a 58.015 deg field of view for all 1648 pixels works perfectly and is also consistent with the 58 deg value for JunoCam that I've seen elsewhere and it's also consistent with JunoCam's focal length and pixel size.

As usual a big part of the work involved correcting the pointing. I used SPICE kernels and software I wrote using the SPICE toolkit to get the spacecraft position and pointing and to optionally correct the pointing (somewhat comparable to what the ISIS3 deltack program does). For the interested, here is an example of the output. It's somewhat similar to a PDS label file but with some 'new' custom labels that I added.

CODE
/* Spicegeom version 2017-02-28 */
TARGET_NAME="Jupiter"
SPACECRAFT_NAME="Juno"
IMAGE_NUMBER="        -1"
IMAGE_TIME="2017-FEB-02 15:57:44.297"
SC_TARGET_POSITION_VECTOR=(-148470.35180453,63094.92703727,-301286.56346215)
TARGET_CENTER_DISTANCE=341757.236215459
SUB_SPACECRAFT_LATITUDE=-61.833627009783
SUB_SPACECRAFT_LONGITUDE=203.026167185770
SUB_SPACECRAFT_LINE_SAMPLE=832.2795709754
SUB_SPACECRAFT_LINE=738.4562742541
SAMPLE_TO_BE_CORRECTED=494.0000000000
LINE_TO_BE_CORRECTED=753.0000000000
SAMPLE_CORRECTION=-20.0000000000
LINE_CORRECTION=7.0000000000
NORTH_AZIMUTH=90.45299584
FIELD_OF_VIEW=58.01500000
/* LOOK_AT includes a possible user-specified correction to LINE[_SAMPLE] */
/* In contrast, SUB_SPACECRAFT_LINE[_SAMPLE] does not include this correction */
LOOK_AT_X=-143367.5394205331
LOOK_AT_Z=-292943.9225293422
LOOK_AT_Y=61006.4711387579
PLANETOGRAPHIC_SUB_SPACECRAFT_LATITUDE=-64.90958822
SUB_SOLAR_LATITUDE=-2.582962
SUB_SOLAR_LONGITUDE=100.197161
SOLAR_DISTANCE=815580051.923982
PLANETOGRAPHIC_SUB_SOLAR_LATITUDE=-2.953164
PHASE_ANGLE=93.724392


Next: Processing a much closer and higher resolution image of Jupiter.
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mcaplinger
post Mar 7 2017, 01:42 AM
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QUOTE (Bjorn Jonsson @ Mar 6 2017, 04:24 PM) *
Maybe I'm missing something elementary but the value 61.69 deg seems strange and I get weird results if I use it.

61.69 is simply the crosstrack FOV if the camera were a perfect pinhole camera with the given pixel pitch and focal length; i.e., degrees(1600*7.4e-3/10.997) = 61.69.

Of course, the camera is not a perfect pinhole camera so you shouldn't expect the 61.69 to be particularly meaningful; it's in a comment after all.

The I kernel (and the frames kernel for Junocam) are admittedly works in progress. I hope to have another update in a few months.


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
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Posts in this topic
- Gerald   Juno perijove 4   Jan 20 2017, 11:16 PM
- - PhilipTerryGraham   It'll be good to see JIRAM up and running agai...   Jan 22 2017, 02:34 PM
- - PhilipTerryGraham   I redecorated the subreddit again, this time in an...   Jan 30 2017, 08:44 PM
- - mcaplinger   Unofficial status: Be advised that even though PJ4...   Feb 2 2017, 05:04 AM
|- - mcaplinger   QUOTE (mcaplinger @ Feb 1 2017, 09:04 PM)...   Feb 3 2017, 09:56 PM
|- - Gerald   QUOTE (mcaplinger @ Feb 3 2017, 10:56 PM)...   Feb 4 2017, 05:28 AM
- - Gerald   Thanks a lot! This helps planning the processi...   Feb 2 2017, 04:38 PM
- - PhilipTerryGraham   Any word on JIRAM or Waves stuff, by any chance?   Feb 2 2017, 10:54 PM
- - mcaplinger   Note that this pass was in the MWR attitude so the...   Feb 2 2017, 11:10 PM
- - Gerald   According to the updated news, all instruments hav...   Feb 3 2017, 11:21 AM
- - PhilipTerryGraham   They did it again, releasing JunoCam data much ear...   Feb 4 2017, 02:18 AM
- - Gerald   Here a draft version of RGB close-ups. This versio...   Feb 4 2017, 05:07 PM
- - Roman Tkachenko   The Pearl of Jupiter   Feb 4 2017, 06:07 PM
|- - mcaplinger   QUOTE (Roman Tkachenko @ Feb 4 2017, 10:0...   Feb 8 2017, 07:45 PM
|- - Roman Tkachenko   QUOTE (mcaplinger @ Feb 8 2017, 11:45 PM)...   Feb 20 2017, 03:28 PM
- - jccwrt   The final image of Jupiter's south pole using ...   Feb 4 2017, 11:31 PM
- - t_oner   Enhanced Justin's image a little bit.   Feb 5 2017, 08:55 PM
- - Roman Tkachenko   Jupiter's South Pole (PJ-4)   Feb 6 2017, 08:56 AM
|- - PaulH51   QUOTE (Roman Tkachenko @ Feb 6 2017, 04:5...   Feb 6 2017, 09:12 AM
- - Gerald   This is a 5-fold reduced full version of the PJ04 ...   Feb 9 2017, 12:14 AM
- - nprev   Mike, your 'mediocre' camera is beyond the...   Feb 9 2017, 01:58 AM
- - Gerald   Selected PJ04 Approach Movie RGB images. Enhanced ...   Feb 9 2017, 09:03 PM
- - Gerald   The first 20 PJ-04 Departure Movie images. These d...   Feb 13 2017, 09:18 PM
- - PhilipTerryGraham   QUOTE (nprev @ Feb 9 2017, 12:58 PM) Mike...   Feb 14 2017, 03:26 PM
|- - mcaplinger   QUOTE (PhilipTerryGraham @ Feb 14 2017, 07...   Feb 14 2017, 05:41 PM
- - PhilipTerryGraham   QUOTE (mcaplinger @ Feb 15 2017, 04:41 AM...   Feb 14 2017, 07:13 PM
- - Explorer1   Say they are lucky to get any images at all, and t...   Feb 14 2017, 08:58 PM
|- - mcaplinger   QUOTE (Explorer1 @ Feb 14 2017, 12:58 PM)...   Feb 14 2017, 09:53 PM
|- - JRehling   QUOTE (mcaplinger @ Feb 14 2017, 02:53 PM...   Feb 22 2017, 08:58 PM
- - PhilipTerryGraham   An interesting question was brought up by my frien...   Feb 19 2017, 07:07 AM
- - jccwrt   I took a look a while back, but that was still whe...   Feb 19 2017, 07:21 PM
- - Gerald   PJ05 is 2017 MAR 27 08:52:14 (according to SPICE s...   Feb 19 2017, 10:05 PM
|- - mcaplinger   QUOTE (Gerald @ Feb 19 2017, 02:05 PM) Th...   Feb 19 2017, 11:41 PM
- - Floyd   Adding 53.5 days to last known perijove is difficu...   Feb 20 2017, 01:53 AM
|- - mcaplinger   QUOTE (Floyd @ Feb 19 2017, 05:53 PM) Add...   Feb 20 2017, 03:35 AM
- - Gerald   PJ03 Image #73 has been taken 6h42m before PJ04, i...   Feb 20 2017, 09:01 AM
- - PhilipTerryGraham   Here's what Eyes on the Solar System has in it...   Feb 21 2017, 04:31 PM
- - Gerald   The most accurate published times for perijoves 6 ...   Feb 21 2017, 06:05 PM
- - mcaplinger   The most accurate source of PJ times I know of are...   Feb 21 2017, 06:43 PM
|- - PhilipTerryGraham   QUOTE (mcaplinger @ Feb 22 2017, 05:43 AM...   Feb 21 2017, 07:21 PM
- - Gerald   For the simulation you require more than just the ...   Feb 21 2017, 09:45 PM
|- - mcaplinger   QUOTE (Gerald @ Feb 21 2017, 01:45 PM) Fo...   Feb 21 2017, 10:04 PM
|- - JRehling   FYI, Io shadow passes across Jupiter occur every 4...   Mar 6 2017, 09:29 PM
- - PhilipTerryGraham   Congrats to Roman for what is now his third image ...   Feb 24 2017, 05:11 PM
|- - Roman Tkachenko   QUOTE (PhilipTerryGraham @ Feb 24 2017, 09...   Feb 24 2017, 11:26 PM
- - Gerald   Selected PJ04 images cylindrically map projected, ...   Mar 6 2017, 09:12 PM
- - Bjorn Jonsson   Now at last I took the time to finish the Juno-rel...   Mar 7 2017, 12:24 AM
|- - mcaplinger   QUOTE (Bjorn Jonsson @ Mar 6 2017, 04:24 ...   Mar 7 2017, 01:42 AM
|- - Gerald   QUOTE (Bjorn Jonsson @ Mar 7 2017, 01:24 ...   Mar 7 2017, 08:26 AM
|- - Bjorn Jonsson   QUOTE (Gerald @ Mar 7 2017, 08:26 AM) In ...   Mar 8 2017, 01:36 AM
- - Gerald   Montage of cylindrical planetocentrical PJ04 maps ...   Mar 8 2017, 03:26 AM
- - Gerald   The individual cropped cylindrical PJ-04 maps, som...   Mar 8 2017, 10:00 PM
- - Roman Tkachenko   Dark Spot and Jovian 'Galaxy' (Enhanced Co...   Mar 9 2017, 01:23 PM
|- - Bjorn Jonsson   QUOTE (Roman Tkachenko @ Mar 9 2017, 01:2...   Mar 9 2017, 09:55 PM
|- - JRehling   As we all know, Jupiter has a visible "surfac...   Mar 10 2017, 05:01 AM
||- - Gerald   QUOTE (JRehling @ Mar 10 2017, 06:01 AM) ...   Mar 10 2017, 10:51 AM
|- - stevesliva   QUOTE (Bjorn Jonsson @ Mar 9 2017, 04:55 ...   Mar 10 2017, 05:17 PM
- - Gerald   Nice! Some more recreation: Oval BA and ...   Mar 9 2017, 09:01 PM
- - Gerald   Roman's image shows parts of the northern hemi...   Mar 11 2017, 01:45 AM
- - Gerald   I wondered, whether the polar CH4 images can be pa...   Mar 11 2017, 08:24 PM
- - Gerald   PJ04 #102 in the context of #085 and #122: (NASA ...   Mar 14 2017, 02:45 AM
- - Gerald   A more complete set of rgb and methane band cylind...   Mar 15 2017, 01:59 AM
- - Bjorn Jonsson   The JunoCam images are in a word awesome. They are...   Mar 24 2017, 07:51 PM
|- - JRehling   Amazing, Bjorn, and wonderful. The white ovals are...   Mar 27 2017, 02:32 AM
- - PhilipTerryGraham   Wow Bjorn! This is some absolutely incredible ...   Mar 24 2017, 08:22 PM
|- - stevesliva   QUOTE (PhilipTerryGraham @ Mar 24 2017, 03...   Mar 26 2017, 01:33 AM
- - Gerald   Well, each perijove would/should allow for dozens ...   Mar 26 2017, 11:44 AM
- - Gerald   Here the first 170 frames of the same sequence as ...   Mar 26 2017, 09:13 PM
- - Gerald   A 361 frames AVI version (125-fold time-lapse) of ...   Mar 27 2017, 06:11 AM
- - Gerald   PJ-04 animation on youtube derived from images #09...   Mar 28 2017, 02:27 PM
- - Sean   PJ04 portrait based on Gerald's work... Det...   May 24 2017, 12:36 PM
- - Sean   I'm constantly surprised how much detail can b...   May 24 2017, 01:49 PM
- - Sean   PJ04 portraits...testing some new blending methods...   May 24 2017, 04:29 PM
- - jccwrt   I think I found some examples of gravity waves in ...   May 26 2017, 09:35 PM
- - Sean   PJ04_109 portrait using Gerald's work...   May 28 2017, 08:36 PM
- - Sean   Here is a Juno sketch...   Jun 4 2017, 07:36 PM
- - Bjorn Jonsson   This is a highly speculative experimental anaglyph...   Sep 4 2017, 01:24 PM
|- - JRehling   Bjorn, I love the anaglyphs. One possibly helpful...   Dec 11 2017, 04:07 PM
- - Sean   PJ04_106   Dec 8 2017, 08:10 PM
- - Sean   PJ04_101 Detail   Dec 11 2017, 03:37 PM
- - Gerald   The channels are essentially mixed. You won't ...   Dec 11 2017, 06:42 PM
- - Sean   PJ04_100 PJ04_100 detail   Dec 11 2017, 08:58 PM
- - Sean   PJ04_099 [ after Gerald's work ] Detail 00...   Dec 11 2017, 11:58 PM
- - Sean   PJ04_107 Details   Dec 12 2017, 03:07 PM
- - Gerald   A first revision of the Perijove-04 animation is o...   Dec 14 2017, 05:17 PM
- - Sean   More tinkering with PJ04_101 [G.Eichstadt] this ti...   Dec 15 2017, 01:51 AM
- - Sean   PJ04_107 update [G.Eichstadt]   Dec 16 2017, 07:14 PM
- - Sean   PJ04_100 update [G.Eichstadt]   Dec 16 2017, 08:36 PM
- - Sean   PJ04_106 details & portrait, new pass   Apr 16 2018, 11:39 PM
- - Sean   A new take on PJ04_106 GE/SD   Mar 21 2019, 09:36 PM


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