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Voyager 2 imaging of Triton
angel1801
post Mar 7 2006, 04:15 PM
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I was just wondering if someone has "super enhanced" the Voyager 2 images of Neptune's largest moon Triton and made them available to the public? I've read about and seen it done on Voyager images of Saturn's moons. Considering there won't be an orbiter going to Neptune being launched for a long time, this could be very worth while idea.


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Bjorn Jonsson
post Aug 24 2014, 05:03 PM
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I have the same experience as Ted and Gordan, I always need to use various correction/fudge factors to get correct color when doing color composites from the Voyager images. As Gordan mentioned, the green channel is usually too bright. I usually use the calibrated and geometrically corrected images available at the PDS Planetary Rings Node but I get similar results if I start with the raw (*.IMQ) images and calibrate them myself.

I haven't done any systematic analysis to see if this problem varies as a function of time, exposure, gain etc. but I suspect that at least time (or mission phase) is significant. For many targets I can use the global spectrum to check the color but this is especially difficult for Triton since its color varies with time. For Neptune I can use its spectrum plus HST images to check the color and determine the correction factors - using the same processing parameters for Triton might work to get correct color.
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4throck
post Aug 29 2014, 02:54 PM
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QUOTE (Bjorn Jonsson @ Aug 24 2014, 05:03 PM) *
I haven't done any systematic analysis to see if this problem varies as a function of time, exposure, gain etc. but I suspect that at least time (or mission phase) is significant.


Back at the time I was playing with Voyager images I also noticed that. My guess is that the filter's response changed with time. So it's dependent on mission time, craft and camera.

If there are any images of stars taken during the mission (I guess so) perhaps they can be used to infer calibration.
"White" satellites (if we have some spectra for them) would also work on distant images that show more than one (for different brightness), so that you could linearize the filters response.
Just my 2 cents...


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Posts in this topic
- angel1801   Voyager 2 imaging of Triton   Mar 7 2006, 04:15 PM
- - tedstryk   QUOTE (angel1801 @ Mar 7 2006, 04:15 PM) ...   Mar 7 2006, 04:21 PM
- - Decepticon   Here are some of my favs... global views http://a...   Mar 7 2006, 11:26 PM
|- - Tayfun Öner   QUOTE (Decepticon @ Mar 8 2006, 01:26 AM)...   Mar 8 2006, 09:31 AM
|- - TritonAntares   QUOTE (Decepticon @ Mar 8 2006, 12:26 AM)...   Mar 8 2006, 11:11 PM
|- - tedstryk   Looks to me like like it is a color balance issue....   Mar 9 2006, 02:41 AM
- - machi   Result from cooperation with Ted Stryk. Triton ani...   Jan 10 2010, 05:32 PM
- - Stefan   Two Triton color composites:   Jan 10 2010, 08:59 PM
- - machi   Very nice images Stefan! Especially second one...   Jan 11 2010, 11:02 AM
|- - Stefan   Thanks, perhaps I'll find time to improve it. ...   Jan 11 2010, 03:49 PM
|- - tedstryk   QUOTE (machi @ Jan 11 2010, 11:02 AM) I s...   Jan 11 2010, 06:39 PM
- - Ian R   I've often wondered which Voyager picture Cand...   Oct 16 2010, 01:30 AM
- - DrShank   i had forgotten about this idea long ago. interes...   Oct 16 2010, 04:35 PM
- - Phil Stooke   I agree. It was an interesting idea, but differen...   Oct 16 2010, 04:55 PM
|- - tedstryk   I played around with it when I was working on the ...   Oct 19 2010, 04:16 PM
- - machi   A long time ago, nearby a planet far far away ... ...   May 27 2011, 05:16 PM
- - machi   Second image:   May 27 2011, 05:18 PM
|- - TrappistPlanets   QUOTE (machi @ May 27 2011, 06:18 PM) Sec...   Nov 7 2021, 02:49 PM
- - elakdawalla   Those are beautiful as usual, machi. Do you see a...   May 27 2011, 05:47 PM
- - machi   Rather not. It looks that most of color difference...   May 27 2011, 06:19 PM
|- - ugordan   Awesome work, these are keepers. Love the colors, ...   May 27 2011, 07:47 PM
- - john_s   I also love the colors- they ring truer, somehow, ...   May 27 2011, 09:31 PM
|- - tedstryk   Spectacular! Wow, I never thought of merging ...   May 28 2011, 02:30 AM
|- - DrShank   i still wonder what the rest of Triton looks like ...   May 28 2011, 02:35 AM
- - scalbers   Greetings, Thought I'd post here an updated v...   Feb 19 2012, 05:49 PM
- - Stefan   I was inspired by that nice blog post ...   Feb 1 2014, 07:10 PM
- - JohnVV   that is voy2 PDS image "c1140138.imq" h...   Feb 2 2014, 12:57 AM
- - Stefan   I am always fascinated by this image (C1139627), b...   Feb 2 2014, 01:37 PM
|- - john_s   Yes, it's a beauty! It's also rather ...   Feb 2 2014, 02:53 PM
|- - Stefan   QUOTE (john_s @ Feb 2 2014, 03:53 PM) Yes...   Feb 4 2014, 09:04 AM
|- - tedstryk   This shows how the images fit together.   Feb 4 2014, 07:04 PM
- - MarcF   I agree ! This is my favourite image of the Vo...   Feb 2 2014, 04:28 PM
- - Phil Stooke   You might like to look back at this thread as well...   Feb 2 2014, 07:39 PM
- - Doug M.   We're not seeing any better images of Triton f...   Feb 3 2014, 10:31 AM
|- - tedstryk   What is the WATT?   Feb 3 2014, 10:38 AM
|- - centsworth_II   QUOTE (tedstryk @ Feb 3 2014, 05:38 AM) W...   Feb 3 2014, 01:41 PM
- - MarcF   Do you mean James Webb space telescope ?   Feb 3 2014, 01:45 PM
- - centsworth_II   Woops! Don't worry mister Watt, some day ...   Feb 3 2014, 02:09 PM
|- - tedstryk   The JWST is an infrared telescope. It won't h...   Feb 3 2014, 04:24 PM
- - JohnVV   so basically it is reprocessing the old data with...   Feb 3 2014, 07:05 PM
- - dtolman   Hmmm... in the post Hubble era, will any scope be ...   Feb 4 2014, 01:40 AM
- - djellison   Pre or post Hubble....physics is physics.....the l...   Feb 4 2014, 01:44 AM
|- - dtolman   Sorry - wasn't clear. I wasn't asking if w...   Feb 4 2014, 01:48 AM
- - JohnVV   a BUNCH of new spacecraft will need to be sent out...   Feb 4 2014, 02:42 AM
- - Phil Stooke   Telescopes on the ground as good as Hubble - you b...   Feb 4 2014, 04:26 AM
- - Doug M.   Daaah, the Webb not the Watt. Excuse me. A new g...   Feb 4 2014, 09:00 AM
- - Doug M.   Gorgeous. Makes you wonder if Pluto will have sim...   Feb 4 2014, 07:31 PM
|- - john_s   Couple comments: 1) I thought the crisp horizon s...   Feb 4 2014, 09:55 PM
|- - Doug M.   QUOTE (john_s @ Feb 4 2014, 11:55 PM) 2) ...   Feb 5 2014, 08:58 AM
|- - Stefan   QUOTE (john_s @ Feb 4 2014, 10:55 PM) 1) ...   Feb 5 2014, 10:59 AM
|- - tedstryk   John, is this the original caption? I'm assum...   Feb 5 2014, 11:43 AM
|- - john_s   Yes, and yes. I was a post-doc at the time, worki...   Feb 5 2014, 08:51 PM
- - machi   QUOTE (dtolman @ Feb 4 2014, 02:48 AM) So...   Feb 6 2014, 12:15 AM
- - MarcF   Even if there will be no mission to Neptune and Tr...   Feb 6 2014, 09:20 PM
- - TheAnt   I have always thought Triton to be among the very ...   Aug 22 2014, 02:23 PM
- - scalbers   Yes, nice details can be seen on this map (from Dr...   Aug 22 2014, 06:18 PM
|- - TheAnt   QUOTE (scalbers @ Aug 22 2014, 08:18 PM) ...   Aug 22 2014, 09:48 PM
|- - ugordan   QUOTE (scalbers @ Aug 22 2014, 08:18 PM) ...   Aug 23 2014, 04:19 PM
|- - tedstryk   This was my result with that dataset. I will say ...   Aug 23 2014, 08:05 PM
|- - DrShank   QUOTE (ugordan @ Aug 23 2014, 11:19 AM) I...   Aug 23 2014, 09:34 PM
- - MarcF   Paul Schenk is a magician to turn old pictures in ...   Aug 22 2014, 07:27 PM
- - DrShank   hi guys, thanks for the nice words. more new maps...   Aug 23 2014, 09:26 PM
|- - TheAnt   QUOTE (DrShank @ Aug 23 2014, 11:26 PM) ....   Aug 25 2014, 12:17 PM
- - Bjorn Jonsson   I have the same experience as Ted and Gordan, I al...   Aug 24 2014, 05:03 PM
|- - 4throck   QUOTE (Bjorn Jonsson @ Aug 24 2014, 05:03...   Aug 29 2014, 02:54 PM
- - Phil Stooke   Fantastic new map of Triton, Paul, thanks! It...   Aug 26 2014, 01:54 PM
- - MarcF   Finally a "serious" geological map of Tr...   Aug 1 2018, 09:59 AM
- - MarcF   2018 paper with Voyager II Triton images: Planeta...   Aug 6 2018, 05:14 PM
- - nprev   Resurrecting a dormant thread, there's a new p...   Sep 2 2021, 02:12 AM
|- - TrappistPlanets   QUOTE (nprev @ Sep 2 2021, 03:12 AM) Resu...   Sep 19 2021, 06:29 PM
- - climber   As a personal story, I was with TPS for Planetfest...   Sep 2 2021, 07:28 AM
- - TrappistPlanets   i compiled most of the stuff into the below   Sep 19 2021, 07:43 PM
- - Floyd   It is not clear to me what what areas you refer to...   Nov 7 2021, 04:23 PM
|- - JRehling   By no means is doing this with images that someone...   Nov 7 2021, 04:46 PM
||- - TrappistPlanets   QUOTE (JRehling @ Nov 7 2021, 04:46 PM) B...   Nov 7 2021, 07:30 PM
||- - mcaplinger   QUOTE (TrappistPlanets @ Nov 7 2021, 11:3...   Nov 7 2021, 07:38 PM
|||- - TrappistPlanets   QUOTE (mcaplinger @ Nov 7 2021, 07:38 PM)...   Nov 7 2021, 10:51 PM
|||- - djellison   QUOTE (TrappistPlanets @ Nov 7 2021, 03:5...   Nov 7 2021, 11:12 PM
|||- - mcaplinger   QUOTE (TrappistPlanets @ Nov 7 2021, 02:5...   Nov 8 2021, 01:39 AM
||- - JRehling   QUOTE (TrappistPlanets @ Nov 7 2021, 12:3...   Nov 7 2021, 07:48 PM
|- - TrappistPlanets   QUOTE (Floyd @ Nov 7 2021, 04:23 PM) It i...   Nov 7 2021, 07:24 PM
- - JohnVV   use PILOT it is a search tool you will need to...   Nov 8 2021, 02:24 AM
|- - TrappistPlanets   QUOTE (JohnVV @ Nov 8 2021, 02:24 AM) use...   Nov 9 2021, 11:55 AM
- - JohnVV   i think that " img2png" can open Voyager...   Nov 9 2021, 02:40 PM
|- - TrappistPlanets   QUOTE (JohnVV @ Nov 9 2021, 03:40 PM) i t...   Nov 9 2021, 09:51 PM
|- - Brian Swift   QUOTE (TrappistPlanets @ Nov 9 2021, 01:5...   Nov 10 2021, 12:34 AM
- - kymani76   Recently data from the article by Schenk et al. 20...   Jun 20 2022, 01:20 PM
- - kymani76   Kibu Patera close-up map.   Jun 20 2022, 01:22 PM


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