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  #1  
Old 01-06-2017, 07:14 PM
Mr. Kobayashi Mr. Kobayashi is offline
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What does Jupiter look like from Mars?

Basically as the title - what does Jupiter look like in the Martian sky, especially at its closest point? Would it be visible with the naked eye (assuming you can, you know, breath)? I've JFGI but it turns out one image I've found is a big load of shite which is a shame.
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  #2  
Old 01-06-2017, 07:18 PM
Lemur866 Lemur866 is online now
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Jupiter is easily visible from Earth, so of course it would be visible from Mars.
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Old 01-06-2017, 07:25 PM
Mr. Kobayashi Mr. Kobayashi is offline
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Oh yeah, oops, I meant is it visible in any more...detail with the naked eye?
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  #4  
Old 01-06-2017, 07:38 PM
blue infinity blue infinity is offline
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Earth orbits at 1 AU, Mars at around 1.5 AU and Jupiter at 5 AU.

So the distance between Earth and Jupiter varies between 4 to 6 AU, and the distance between Mars and Jupiter between 3.5 and 6.5 AU.

Jupiter would look pretty much the same from Mars, as it does from Earth.
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  #5  
Old 01-06-2017, 07:41 PM
Ignotus Ignotus is offline
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You'd have a lot less of atmosphere bothering you on Mars though.
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  #6  
Old 01-06-2017, 08:04 PM
Stranger On A Train Stranger On A Train is offline
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Originally Posted by blue infinity View Post
Jupiter would look pretty much the same from Mars, as it does from Earth.
It would be somewhat brighter (at closest approach), and would also be clearer in a telescope because of the minimal atmosphere if Mars. The biggest difference would probably be in the increased visibility of the Galilaen moons, although they are still going to be barely more than dots in a portable telescope.

Stranger
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  #7  
Old 01-06-2017, 08:42 PM
Francis Vaughan Francis Vaughan is online now
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The Galilean moons might be an interesting question. They are just on the edge of visibility from the Earth. There is a lovely story from some decades ago of an amateur astronomer showing his little daughter a view of Jupiter with his telescope. She exclaimed - "But Daddy, they are the wrong way up!" After some confusion, it became apparent that she could actually see the moons with no optical assistance. It isn't that the moons are too dim - but that the angular separation from Jupiter is too little to avoid Jupiter's brightness making it too hard to separate. Very acute sight with very good atmospheric seeing could reasonably account for the little girl's capability. With no meaningful atmosphere on Mars the seeing will be very stable and clear. This might be enough to make seeing the moons a reasonable thing.

Jupiter's disk however will remain unresolved. It will still be a point.

Last edited by Francis Vaughan; 01-06-2017 at 08:42 PM..
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  #8  
Old 01-06-2017, 10:36 PM
Chronos Chronos is offline
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And being closer (at closest approach, at least) would also increase the angular separation.
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  #9  
Old 01-06-2017, 11:03 PM
watchwolf49 watchwolf49 is offline
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Bonus question: What would Earth look like from Mars?
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  #10  
Old 01-06-2017, 11:14 PM
Richard Pearse Richard Pearse is online now
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Bonus question: What would Earth look like from Mars?
Presumably much the same as Mars looks like from Earth no? But with a faint blue tinge instead of red.
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Old 01-06-2017, 11:18 PM
AK84 AK84 is online now
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Bonus question: What would Earth look like from Mars?
Like so.
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  #12  
Old 01-06-2017, 11:40 PM
markn+ markn+ is offline
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The angular diameter of Mars as seen from Earth varies quite a bit depending on the position of the planets in their orbits, from about 3.5 arc seconds to over 25. So Earth's angular diameter as seen from Mars should vary in the same way, except Earth would be about twice the diameter, varying between 7 and 50 arc seconds.
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  #13  
Old 01-07-2017, 01:53 AM
coremelt coremelt is offline
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BTW, if you want to work out "what would X look like from Y" not just for the solar system but a bunch of real star systems take a look a Universe Sandbox:

http://universesandbox.com/

Not 100 percent accurate but it aims to use real world physics as much as they can with the limitations of desktop computers. For things like views of planets from any moon / planet in the solar system it should be pretty close.
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  #14  
Old 01-07-2017, 01:57 AM
dtilque dtilque is online now
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Originally Posted by markn+ View Post
The angular diameter of Mars as seen from Earth varies quite a bit depending on the position of the planets in their orbits, from about 3.5 arc seconds to over 25. So Earth's angular diameter as seen from Mars should vary in the same way, except Earth would be about twice the diameter, varying between 7 and 50 arc seconds.
Earth's albedo (fraction of light reflected back to space) is about twice Mars', so it's going to be brighter for that was well. I'd say that Earth as seen from Mars will be more like Venus from Earth, than Mars from Earth. Especially so since it'll go through phases like Venus does.

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Originally Posted by Francis Vaughan View Post
Jupiter's disk however will remain unresolved. It will still be a point.
Jupiter is not quite a point to the naked eye. Stars are point sources and because of that, they twinkle due to atmospheric irregularities. Planets don't twinkle as much as stars do, because they do show just a bit of disk. This effect should be more pronounced when seeing Jupiter at Mars, but you still won't be able to see any detail on Jupiter.
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  #15  
Old 01-07-2017, 08:58 AM
Darren Garrison Darren Garrison is offline
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Not what you are asking for, but a new photo of Earth and the moon from Mars.
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  #16  
Old 01-07-2017, 09:01 AM
Chronos Chronos is offline
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Earth from Mars will be brighter than Mars from Earth, for three reasons: First, Earth is closer to the Sun, and so gets more sunlight to reflect. Second, Earth has a much higher albedo, mostly due to clouds. Third, Earth is bigger. The net effect wouldn't be quite as bright as Venus is from Earth, but it'd still be plenty impressive. Especially since Earth would always be accompanied by another decently-bright point of light, Luna.
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  #17  
Old 01-07-2017, 09:12 AM
watchwolf49 watchwolf49 is offline
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Originally Posted by Chronos View Post
Earth from Mars will be brighter than Mars from Earth, for three reasons: First, Earth is closer to the Sun, and so gets more sunlight to reflect. Second, Earth has a much higher albedo, mostly due to clouds. Third, Earth is bigger. The net effect wouldn't be quite as bright as Venus is from Earth, but it'd still be plenty impressive. Especially since Earth would always be accompanied by another decently-bright point of light, Luna.
[wipes tear off cheek] ... sounds purdy ...
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  #18  
Old 01-07-2017, 09:25 AM
Darren Garrison Darren Garrison is offline
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Quote:
Originally Posted by Chronos View Post
Earth from Mars will be brighter than Mars from Earth, for three reasons: First, Earth is closer to the Sun, and so gets more sunlight to reflect. Second, Earth has a much higher albedo, mostly due to clouds. Third, Earth is bigger. The net effect wouldn't be quite as bright as Venus is from Earth, but it'd still be plenty impressive. Especially since Earth would always be accompanied by another decently-bright point of light, Luna.
Is this taking into account the fact that, being further than the sun from us, we always see a "full Mars", but Earth, being closer to the sun than Mars, is only a "full Earth" when it is on the opposite side of the sun from Mars, and only in partial phase (or entirely dark) when closer to Mars?
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  #19  
Old 01-07-2017, 09:54 AM
Chronos Chronos is offline
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Ah, right, forgot about phases. While which effect would dominate would depend on the phase, I think the net effect would still be that Earth is usually brighter. But I haven't run the numbers.
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  #20  
Old 01-07-2017, 10:19 AM
watchwolf49 watchwolf49 is offline
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Venus is currently an evening star ... look to the west as soon as it's fairly dark after sunset ... Venus will be the brightest star far and away ... roughly half illuminated ... someone with even a small telescope can verify this ... I haven't ...
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  #21  
Old 01-07-2017, 01:17 PM
harmonicamoon harmonicamoon is offline
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What would Jupiter look like from Europa?

I am thinking about moving to Europa.
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  #22  
Old 01-07-2017, 01:45 PM
Weisshund Weisshund is offline
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What would Jupiter look like from Europa?

I am thinking about moving to Europa.
Like this?
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  #23  
Old 01-07-2017, 01:55 PM
John Mace John Mace is offline
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What would Jupiter look like from Europa?

I am thinking about moving to Europa.
Better do so before Jupiter leaves the Europa Union.
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  #24  
Old 01-07-2017, 01:57 PM
DSYoungEsq DSYoungEsq is offline
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Quote:
Originally Posted by Chronos View Post
Ah, right, forgot about phases. While which effect would dominate would depend on the phase, I think the net effect would still be that Earth is usually brighter. But I haven't run the numbers.
Keeping in mind that the distance from Mars to Earth when Earth is at its fullest separation from the Sun is significantly greater than the Earth to Venus distance under the same conditions, of course.
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  #25  
Old 01-07-2017, 01:58 PM
DSYoungEsq DSYoungEsq is offline
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Better do so before Jupiter leaves the Europa Union.
Jupitexit?
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  #26  
Old 01-18-2017, 12:44 PM
Blue Blistering Barnacle Blue Blistering Barnacle is offline
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How much easier would it be for Martians to deduce Heliocentric system? They would have an easy example of another body with a satellite. They have 2 moons themselves. They would have an extra planet with phases.

How about Kepler's laws?

I'm guessing Europans (at least the ones living on top of the ice) might do quite well.
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