Europa Flyby - PJ45, September 29, 2022 |
Europa Flyby - PJ45, September 29, 2022 |
Sep 13 2022, 02:58 AM
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#1
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
Juno is set to flyby of Europa on Sept. 29, 2022 (PJ45)
I can't wait to see the results of this flyby! Sadly not much information is available online. Jason Has a beautiful animation of encounter on youtube. https://www.youtube.com/watch?v=r9bx1GcoqEE...nel=volcanopele |
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Oct 1 2022, 11:12 PM
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#2
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
A 4K version of the earlier Europa blinking comparison, with more accurate mapping:
https://stevealbers.net/albers/sos/jupiter/...uropa_blink.gif UPDATE: PJ45_4 now added. -------------------- Steve [ my home page and planetary maps page ]
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Oct 1 2022, 11:34 PM
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#3
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Member Group: Members Posts: 251 Joined: 14-January 22 Member No.: 9140 |
That's a much better fit, scalbers! I'm sure that it took a lot of work. Also, it does a lot to resolve the question of "new" linea in the north. Because the existing imagery came from more than one (usually, in any area: one or two) different illuminations, we can see clearly that in some cases, the same linea appears dark in some earlier imagery, and light in others, then dark in the Juno imagery. I guess this is because of the interaction between some locally extreme topography and albedo, with a raised linea appearing lighter than (or the same brightness as) the background terrain when viewed fore-lit from the side, but darker than the background terrain when viewed from basically any other angle. Ultimately, we're not going to have a seamless map of Europa until we have every part of the surface viewed from approximately the same geometry… but until then, this work is great!
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Oct 2 2022, 12:13 AM
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#4
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
That's a much better fit, scalbers! I'm sure that it took a lot of work. Also, it does a lot to resolve the question of "new" linea in the north. Because the existing imagery came from more than one (usually, in any area: one or two) different illuminations, we can see clearly that in some cases, the same linea appears dark in some earlier imagery, and light in others, then dark in the Juno imagery. I guess this is because of the interaction between some locally extreme topography and albedo, with a raised linea appearing lighter than (or the same brightness as) the background terrain when viewed fore-lit from the side, but darker than the background terrain when viewed from basically any other angle. Ultimately, we're not going to have a seamless map of Europa until we have every part of the surface viewed from approximately the same geometry… but until then, this work is great! The relative contrast and brightness of various features on Europa is known to vary a lot depending on viewing geometry, even when the illumination geometry doesn't change much. Here is a particularly interesting example I posted somewhere years ago, a map-projected blink comparison of Galileo G1 and E14 images: The image with overall lower contrast was obtained during Galileo's G1 orbit and the other one during Galileo's E14 orbit. These two images were obtained when the illumination geometry was very similar but the viewing geometry was not. The viewing geometry can be seen below: |
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