Timeline for What are these mysterious white star-like dots near MU69 Ultima Thule? Real objects near the asteroid, noise, cosmic rays, or something else?
Current License: CC BY-SA 4.0
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| Jun 17, 2020 at 8:54 | history | edited | CommunityBot |
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| Feb 19, 2020 at 12:49 | comment | added | uhoh | @Prakhar update, the raw images have been moved: pluto.jhuapl.edu/soc/Arrokoth-Encounter | |
| May 26, 2019 at 23:44 | vote | accept | uhoh | ||
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| Mar 21, 2019 at 3:44 | answer | added | amI | timeline score: 4 | |
| Mar 20, 2019 at 3:30 | history | edited | uhoh | CC BY-SA 4.0 |
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| S Feb 26, 2019 at 3:02 | history | bounty ended | CommunityBot | ||
| S Feb 26, 2019 at 3:02 | history | notice removed | CommunityBot | ||
| Feb 23, 2019 at 12:02 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 22, 2019 at 21:00 | history | tweeted | twitter.com/StackSpaceExp/status/1099051330130374658 | ||
| Feb 18, 2019 at 2:32 | comment | added | uhoh | @JohnHoltz Assuming these are full frame images, I think all the objects that move together smoothly can't be noise, or hot pixels, and so probably all of them are stars, and their collective motion is the rotation of the spacecraft itself. But that's just my opinion. I'm asking about the similar brightness dots that appear in one frame only, and don't follow any pattern. | |
| Feb 18, 2019 at 2:28 | comment | added | JohnHoltz | The JHUAPL website says "Many background stars are also seen in the individual images", but it would be good to know the field of view and magnitude limit of the exposure/binning to be sure that many of the objects are stars. | |
| Feb 18, 2019 at 2:12 | comment | added | uhoh | @Prakhar I've just added a bounty | |
| S Feb 18, 2019 at 1:08 | history | bounty started | uhoh | ||
| S Feb 18, 2019 at 1:08 | history | notice added | uhoh | Draw attention | |
| Feb 10, 2019 at 4:43 | comment | added | uhoh | @Prakhar the individual images have just become available now including individual timestamps and exposure times! pluto.jhuapl.edu/soc/UltimaThule-Encounter | |
| Feb 9, 2019 at 7:40 | comment | added | uhoh | @Prakhar I am guessing that the spacecraft is also able to rotate at a speed much slower than 30 degrees per second as well. If I use the data shown here (from here), the peak angular rate that Ultima Thule moves wrt to New Horizons is only 14 degrees per minute. i.sstatic.net/9PPkI.png | |
| Feb 9, 2019 at 7:27 | comment | added | zephyr0110 | What makes you think its a way off estimate? If the camera rotates at about 30°/s, if it is say 6 second video, ultima thule image would turn by 180°.. Is it not? | |
| Feb 9, 2019 at 7:16 | comment | added | uhoh | Better not rule anything in or out without hard numbers. There is more than one kind of noise, and we don't know how the images were post-processed yet. I think you are way off on your estimate of time, let's see if we can find some data. I've re-edited the question and have now included the source I used for the GIF image above, as well as a quote. Also, in this answer you can see how the distance and angle changes over time. | |
| Feb 9, 2019 at 7:11 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 9, 2019 at 5:48 | comment | added | zephyr0110 | I think noise can be eliminated as, noise effects randomly to many pixels randomly distributed. And Cosmic rays, well until and unless one crosses Oort Cloud, I doubt cosmic rays can effect so many pixel in just one second in the image sensor. New horizon rotates at about 30 degrees per second, and looking at total rotation of celestial sphere it appears to be 1 second video to me. As to what those white dots are, could it be that the ultima Thule reflection from sun just over exposes the surrounding pixels shadowing the stars for some duration? | |
| Feb 9, 2019 at 3:06 | comment | added | uhoh | I'm still debating if this is better asked here or in Astronomy SE. It's on-topic in both places, arguments can be made both ways. Any thoughts? | |
| Feb 9, 2019 at 2:17 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 9, 2019 at 1:59 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 9, 2019 at 1:55 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 9, 2019 at 1:46 | history | asked | uhoh | CC BY-SA 4.0 |
