by alter-ego » Wed Jul 24, 2013 4:37 am
BMAONE23 wrote:neufer wrote:
Roughly 100,000,000 miles away (i.e., ~1.1 AU away)...I don't think so.
Bode's Law states that Saturn & Jupiter should be ~4.8 AU apart and Earth & Jupiter ~4.2 AU apart.
The actual orbits make Saturn & Jupiter ~4.34 AU apart and Earth & Jupiter ~4.2 AU apart.
Hence, Jupiter appears slightly larger from Earth than from Saturn.
Jupiter can be as large as 50.1 arc seconds in Earth's
midnight sky with an apparent magnitude of -2.94.
Jupiter can be almost that large in Saturn's
midday sky but not nearly so bright.
On June 24, 2000 Jupiter was 4.15 AU away from Saturn at a large 47.5 arc seconds but it was only magnitude 5.2 since only a thin Jupiter South Pole crescent was visible in Saturn's
midday sky.
Hence, our view of Jupiter is
far superior to Saturn's view.
As usual, Neufer is correct. I should have figured the distance instead of trusting a Google Search. I calculated a relative difference between orbits of 551,070,000 K or 342,419,021 miles but with Jupiter's average orbit of 778,030,000k
But I reach an average distance between Earth and Jupiter of 628,730,000k so Jupiter is closer to Saturn and should appear slightly larger in the sky there than it does here
Yes you are right, as viewed from Saturn, Jupiter will appear a
little larger at closest approach.
The orbit elipticities and orientations lead to a rare close separation (in year 2417) ~3.81 AU, with Jupiter's apparent diameter = 51.8", compared to the a 50.1" maximum apparent diameter from Earth (3.94 AU separation). I identified a time where Jupiter's separation from the Sun (as viewed from Saturn) will be <11 arcminutes, so the view might be pretty neat. I can imagine a dimly lit annulus, and possibly a faint view of the ring(s). Although most of the time I'd prefer viewing Jupiter from Earth, Jupiter at or near inferior conjunction might yield some nice photos.
Of course, I'm thinking we would be outside of Saturn's atmosphere.
[quote="BMAONE23"][quote="neufer"]
Roughly 100,000,000 miles away (i.e., ~1.1 AU away)...I don't think so.
[url=http://en.wikipedia.org/wiki/Titius%E2%80%93Bode_law]Bode's Law[/url] states that Saturn & Jupiter should be ~4.8 AU apart and Earth & Jupiter ~4.2 AU apart.
The actual orbits make Saturn & Jupiter ~4.34 AU apart and Earth & Jupiter ~4.2 AU apart.
Hence, Jupiter appears slightly larger from Earth than from Saturn.
Jupiter can be as large as 50.1 arc seconds in Earth's [b][color=#0000FF]midnight sky[/color][/b] with an apparent magnitude of -2.94.
Jupiter can be almost that large in Saturn's [b][color=#FF0000]midday sky[/color][/b] but not nearly so bright.
On June 24, 2000 Jupiter was 4.15 AU away from Saturn at a large 47.5 arc seconds but it was only magnitude 5.2 since only a thin Jupiter South Pole crescent was visible in Saturn's [b][color=#FF0000]midday sky[/color][/b].
Hence, our view of Jupiter is [b][u]far superior[/u][/b] to Saturn's view.
As usual, Neufer is correct. I should have figured the distance instead of trusting a Google Search. I calculated a relative difference between orbits of 551,070,000 K or 342,419,021 miles but with Jupiter's average orbit of 778,030,000k
But I reach an average distance between Earth and Jupiter of 628,730,000k so Jupiter is closer to Saturn and should appear slightly larger in the sky there than it does here[/quote][/quote]
[float=right][img2]http://photojournal.jpl.nasa.gov/jpeg/PIA03001.jpg[/img2][/float]Yes you are right, as viewed from Saturn, Jupiter will appear a [i]little[/i] larger at closest approach.
The orbit elipticities and orientations lead to a rare close separation (in year 2417) ~3.81 AU, with Jupiter's apparent diameter = 51.8", compared to the a 50.1" maximum apparent diameter from Earth (3.94 AU separation). I identified a time where Jupiter's separation from the Sun (as viewed from Saturn) will be <11 arcminutes, so the view might be pretty neat. I can imagine a dimly lit annulus, and possibly a faint view of the ring(s). Although most of the time I'd prefer viewing Jupiter from Earth, Jupiter at or near inferior conjunction might yield some nice photos.
Of course, I'm thinking we would be outside of Saturn's atmosphere.