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Jupiter and it's moons tonight.


Grumpy Martian
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Perishingly cold tonight,just came in.looking at Jupiter a short while ago I counted it's moons. One to the right and three on the left. Three on the left? Looking a little further to the left a little beyond the third moon on the left I saw another object inline with all four of the moons. A star of course. But it did get me thinking could I resolve a fifth moon? I was using my newly acquired 5mm Nagler T6 eyepiece on an 8 inch f6 Newtonian. I wonder which star it was. Much fainter than Jupiters moons.

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The seeing seems better tonight than it's been lately. My ED120 is supporting 180x very nicely on Jupiter. The GRS is more or less in the centre of the disk right now. My Stellarium gets the moon positions right but it's miles out with the GRS position despite me playing with the setup file offeset figure and the lightspeed function. Any tips on how to get this right would be appreciated ! :smiley:

I can see the "extra moon" as well - interesting to compare to Callisto; the star is a point of light wheras the true moons show a definite disk.

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Good that you could get to 180x John. For me 125x seemed the best, 160x was a bit fuzzy.

First night for a while that it's been any use. I'm testing these Myriad eyepieces at the moment and the 5mm and 3.5mm are challenging because the conditions have been too poor to allow high powers on anything  :rolleyes2: 

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It a 9th mag star,the next brightest moon Amalthea is mag 14.1 which i think would need a 10" scope.

I saw the same tonight, Mr Martian - a faint 'star' just beyond Callisto. But I can't see that in Sky Safari even at maximum setting of my app, which says it goes to mag 14.9.

I thought I must be seeing another moon and hunted about online to see if could find out more, but failed.

So what is that 'star'? Any more info, please?

Edited by Floater
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Perishingly cold tonight,just came in.looking at Jupiter a short while ago I counted it's moons. One to the right and three on the left. Three on the left? Looking a little further to the left a little beyond the third moon on the left I saw another object inline with all four of the moons. A star of course. But it did get me thinking could I resolve a fifth moon? I was using my newly acquired 5mm Nagler T6 eyepiece on an 8 inch f6 Newtonian. I wonder which star it was. Much fainter than Jupiters moons.

i saw the same last night down in brighton I thought the same made shaw that the lenes were clean lol it saw still there lol
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I started around 19:00 last night with Ganymede, IO and Europa pretty much equidistant in a compact little line, and

kept coming back to them through the evening watching Ganymede pull away and the inner moons close-in on one-another.

Unfortunately by 23:54 they would still have been an hour and more away from crossing (if they were going to) and I was

Tired and Frozen so went to bed.

It's always good to watch them move about though, especially when you keep in mind that they are moving along your L.O.S.

as well as laterally and the GRS chipped in as well as Venus earlier, then two Comets and some DSOs.

I have enjoyed these Jupiter moon events so far, as they are something physically developing that you get keep checking up on,

but Jupiter has always been like that.

Tonight,  it's still bitter cold but clouded and drizzly and I've read all my Astro-mags. 

Mick

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