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Forum » SpaceEngine » Science and Astronomy Discussions » Planet 9 Thread
Planet 9 Thread
HarbingerDawnDate: Saturday, 03.09.2016, 04:17 | Message # 16
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also planet 9 is so distance, he will be probably barly visible and you wont get pretty images as you think.

At 650 AU, the sun appears as bright as the full moon, which gives sufficient illumination for photography. You would need to be many thousands of AU away from the sun for photography to become difficult. Of course, this is dependent on the visiting spacecraft moving at a SLOW speed relative to the planet (like 20 km/s or less) during its closest approach. So to get good close-up photographs, you would need an orbital mission, not a flyby. And as Watsisname already explained, any mission to Planet Nine would likely be orbital. So you would definitely have pretty pictures smile





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spacerDate: Saturday, 03.09.2016, 09:50 | Message # 17
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HarbingerDawn, but imagine no city lights on earth. and someone would take image of the night side.
would it be really that good pretty images? i would think that maybe with exposure the images will be better.





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steeljaw354Date: Saturday, 03.09.2016, 13:07 | Message # 18
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Well if you had a really really good camera you might have pretty pictures. It will also probably have infrared and stuff like that so we aren't just limited to visible light. An orbiter mission with like 5 small lander probes to land on moons would be cool.
 
HarbingerDawnDate: Saturday, 03.09.2016, 17:15 | Message # 19
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imagine no city lights on earth. and someone would take image of the night side.
would it be really that good pretty images

Yes. This is Earth illuminated by the light of a magnitude -12 gibbous moon. This is the same illumination level as 900 AU from the sun.








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steeljaw354Date: Saturday, 03.09.2016, 17:18 | Message # 20
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We would see lots of detail on the planet, we would want to equip the craft we send there with a very high definition camera (Is my preference) It would cost big bucks to make a really good probe but it is worth it.
 
spacerDate: Saturday, 03.09.2016, 17:50 | Message # 21
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HarbingerDawn, it is really that bright? look almost like daylight.
i would believe its something like that:

and that even with city lights so without it would be even darker
anyway. good to see you again here herb, long time.





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Edited by spacer - Saturday, 03.09.2016, 17:59
 
WatsisnameDate: Saturday, 03.09.2016, 21:02 | Message # 22
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spacer, a camera can make a dark scene look like a bright one (or vice versa!) It's all about how much light it collects on to the sensor, so it depends on the aperture, ISO, and shutter speed. If you bring a DSLR outside on a moon-lit night and use a long exposure, you can take photos that make it look like daylight. smile

I can't find the metadata for the ISS shots Harb posted, but I'd guess the exposures were about a second long. You can see a little bit of trailing on the Earth due to ISS' orbital motion while the shutter was open, while the stars are crisp.





 
HarbingerDawnDate: Saturday, 03.09.2016, 21:04 | Message # 23
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it is really that bright? look almost like daylight.

Yes. That's a real photo after all. Even a small amount of light can be enough for good photographs, it just depends on the camera's optics and exposure settings. Next time there is a full moon I will take a picture of something and post it here.





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HarbingerDawnDate: Saturday, 03.09.2016, 21:07 | Message # 24
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I can't find the metadata for the ISS shots Harb posted

1 sec, f/3.5, ISO 12800 (the data is embedded in the JPEG smile )





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Edited by HarbingerDawn - Saturday, 03.09.2016, 21:08
 
steeljaw354Date: Saturday, 03.09.2016, 21:17 | Message # 25
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So what do you think the planet looks like?
 
AlekDate: Saturday, 03.09.2016, 22:55 | Message # 26
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Quote steeljaw354 ()
So what do you think the planet looks like?


Depending on the amount of energy the inside of the planet produces, it could either be a hazeball like Uranus or something similar to Neptune except maybe not as active, since Neptune has a surprising amount of self-heating, it also depends on its definite mass, as a larger planet should be more likely to have more self heating and therefore a more active atmosphere. As for color...that really just depends on the non-H/He elements in the upper atmosphere which at the moment we don't know and can only be speculated abut until we find it in the sky and/or send a probe to it. (If sedna is any example, we can tell the colors of far away objects from here, its just sort of difficult)





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steeljaw354Date: Saturday, 03.09.2016, 23:01 | Message # 27
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Could the planet be a 10 Earth mass Pluto or Sedna like object instead of an Ice giant like Uranus?
 
AlekDate: Sunday, 04.09.2016, 01:08 | Message # 28
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Only if it had lost the majority of its heat from when it was formed, or if it was made of mostly water from the beginning, both are possible but doubtful. None of the other gas giants have lost all their heat yet, and because of the way planets form, something that size probably would accrete some Hydrogen and Helium, though again, it is possible that it could be icy instead of gaseous.




Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
 
steeljaw354Date: Sunday, 04.09.2016, 01:39 | Message # 29
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What sort of moons would it have?
 
apenpaapDate: Sunday, 04.09.2016, 08:36 | Message # 30
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The mass of the sattelite system of a planet is, barring unusual circumstances like the formation of our own Moon, directly related to the mass of the planet itself. So since Planet 9 is speculated to be a bit lighter than Uranus, and Neptune is a somewhat peculiar case too due to Triton being weird, I would expect a few mid-sized icy moons and a lot of tiny ones like Uranus has.




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