Pluto Atmospheric Observations: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Pluto Atmospheric Observations: NH Post-Encounter Phase, 1 Aug 2015- TBD |
Jun 2 2016, 06:24 AM
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#106
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Senior Member Group: Members Posts: 2085 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Astounding work!
Charon is an invisibly thin crescent at this angle without any atmosphere, correct? Or is it just out of frame? |
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Jun 2 2016, 08:48 AM
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#107
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Member Group: Members Posts: 238 Joined: 15-January 13 Member No.: 6842 |
Sorry if I'm posting this in the wrong thread, but I've just had a question about the backlit shots of Pluto. Has the Sun ever appeared in LORRI's field of view, and are there any images of it there?
I'm asking because LORRI doesn't have a shutter, and a NASA video shows the CGI Sun going behind Pluto and out again: http://www.dailymail.co.uk/sciencetech/art...lyby-Pluto.html On a related topic, has anyone made timelapse videos out of the "sun glare" LORRI images, like this one? http://pluto.jhuapl.edu/soc/Pluto-Encounte...mgType=approved Thank you. -------------------- Curiosity rover panoramas: http://www.facebook.com/CuriosityRoverPanoramas
My Photosynth panoramas: http://photosynth.net/userprofilepage.aspx...;content=Synths |
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Jun 2 2016, 02:53 PM
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#108
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
Aligned on the stars: Stunning. Averaging the frames together you can easily see the path of Pluto relative to the stars: If the path of NH was straight, Pluto's path would look (esssentially) straight relative to the stars. So presumably we're seeing the gravitational effect of Pluto bending NH's path, although the effect seems surprizingly large to me. |
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Jun 2 2016, 03:44 PM
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#109
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I was puzzled about the curve in Pluto's path too. Does it have to do with Pluto's rotation about the system barycenter?
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jun 2 2016, 04:30 PM
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#110
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
If the timespan of those images matches up (around 3 days) I think you've nailed it, Emily.
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Jun 2 2016, 04:35 PM
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#111
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
It's 7 days, or one Pluto rotation period, which makes sense (curve goes out and back). Cool.
Now I want a similar V2 Neptune departure sequence aligned on background stars to contrast that with -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jun 2 2016, 04:38 PM
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#112
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Heh, it looked like half a rotation to me, but now that you mention it I can make out a full sine curve. Cool stuff!
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Jun 2 2016, 04:43 PM
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#113
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Junior Member Group: Members Posts: 75 Joined: 8-July 15 Member No.: 7566 |
New NASA article- Secrets Revealed from Pluto's 'Twilight Zone'
https://www.nasa.gov/feature/secrets-reveal...s-twilight-zone potential cloud spotted! Has anyone tried to match up the nightside terrain silhouette with the low resolution maps of Pluto's far side? I see some rugged, mountain-looking terrain and some very smooth regions. |
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Jun 2 2016, 04:48 PM
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#114
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Junior Member Group: Members Posts: 45 Joined: 27-August 14 From: Private island on Titan Member No.: 7250 |
I'm glad everyone enjoyed that! Yeah, the timespan is from 7/15 at 15:21 to 7/21 at 04:24, so that's almost a full rotation of Pluto and Charon. Judging by the Nasa Eyes simulation, Charon would probably only appear in a few of the frames at the end. I tried stacking multiple frames from individual later observations and still couldn't find her. I was pretty tired while doing that, though.
I really want to do some star-aligned Voyager animations too, now! -------------------- aka the Vidiconvict
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Jun 2 2016, 05:35 PM
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#115
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Appreciate Emily noting the barycenter effect!
As I recall, the NH camera pixels are around 1 arc second in size (smallest yet flown beyond LEO), would the Plutonian system gravitational deflection of NH be superimposed on the barycenter curve as shown, and therefore visible as a slight 'deformation' of the curve, or is the deflection small enough it can only be discerned through the radio science experiment ?? It would be exciting if the effect was large enough to be 'teased' out of the images too. |
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Jun 2 2016, 05:51 PM
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#116
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
Doh - barycentre motion must be it. I mentioned that the effect was surprizingly large if due to the deflection of NH's path by Pluto, tasp - given the speed of the encounter and how far from Pluto we were at the start of this sequence I'd guess that this effect would be very small. But this could easily be confirmed by plotting the barycentre (and Pluto and Charon) positions from the point of view of NH against the fixed stars using some orbital software...
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Jun 2 2016, 06:03 PM
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#117
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Senior Member Group: Members Posts: 2515 Joined: 13-September 05 Member No.: 497 |
As I recall, the NH camera pixels are around 1 arc second in size (smallest yet flown beyond LEO), would the Plutonian system gravitational deflection of NH be superimposed on the barycenter curve as shown, and therefore visible as a slight 'deformation' of the curve, or is the deflection small enough it can only be discerned through the radio science experiment ?? http://www.unmannedspaceflight.com/index.php?showtopic=5079 If the deflection angle is about 2 arc-min per that thread (assuming I haven't made a units conversion mistake), then that would be about 100 LORRI pixels, so yeah, it should be in there somewhere, though there would be some motion of Pluto against the star background even if there was no deflection and even without the barycenter thing. BTW, MOC and HiRISE have smaller IFOVs than LORRI, so your "smallest yet flown beyond LEO" is wrong. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Jun 2 2016, 07:20 PM
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#118
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Senior Member Group: Members Posts: 4247 Joined: 17-January 05 Member No.: 152 |
If the deflection angle is about 2 arc-min per that thread That 2' deflection is the change between the incoming and outgoing directions. Most of that will be incurred very close to closest approach (CA) (I'd think within a few hours). That sequence starts about a day after CA, so the remaining deflection during the sequence will be considerably smaller than 2'. |
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Mar 3 2020, 08:07 PM
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#119
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
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Mar 4 2020, 11:34 PM
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#120
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Member Group: Members Posts: 699 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
I like it! A couple of suggestions-
1) The images appear to be mirror-flipped 2) It would be nice to see a version with the images in chronological order 3) Including the highest-resolution "noodles" would also be cool. John |
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