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Old 02-06-2020, 12:18 PM
Saturnine (Jeff)
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Jupiters Moons

Hi All

Hope this is the correct area to post this info. For those of us that like planetary observing and imaging there are a few interesting events in the next few days.
On the evening of the 4th , into the morning of the 5th, so this Thursday, there will be a double shadow transit, beginning just after Jupiter rises, from an east coast perspective, would be better from NZ.
Times are for EST, taken from Astronomy 2020, Quasar Publishing.

20:34 Ganymede Shadow Ingress
21:20 Europa Shadow Ingress
23:05 Europa Transit Ingress
23:50 Ganymede Shadow Egress
00:06 Europa Shadow Egress
00:09 Ganymede Transit Ingress
01:52 Europa Transit Egress
03:30 Ganymede Transit Egress

Add in the Red Spot on the CM at 00:38am on the 5th.
Should be quite an interesting show for several hours, guaranteed to be cloudy and or crap seeing for sure.
The BOM weather forecast for this area is actually favourable and CFN, although showing low cloud off the coast also shows the jetstream as fairly quiet. So it may be a good nights entertainment after all.
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Old 02-06-2020, 01:23 PM
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Tulloch (Andrew)
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Yep, I've had this on my list since I first noticed the weather in Melbourne was forecast to be clear (and still looks good).

It will be nice to image the planets before going to bed instead of setting the alarm for stupid-o'clock and waking everyone up If I get anything decent, I'll post it here.

Andrew
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Old 02-06-2020, 05:38 PM
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Max Vondel (Peter)
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I am planning on viewing if the weather holds.
Thanks for the heads up
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Old 02-06-2020, 05:50 PM
Saturnine (Jeff)
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Just for added interest, on the 6th June starting at 04:30 am there will be a not so common shadow transit of Callisto. One shadow transit may seem like any other to some people but it is a way of seeing the dynamics of orbital motion at play.
There will be a few more Callisto transits this planet season to whet the appetite too.
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Old 02-06-2020, 09:26 PM
Quopaz (Nick)
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Thanks for that, just converting it to SA times I'm getting double shadow visible from 8:50pm to 11:20pm. Rise at 8:11pm. Weather forecast at this stage- 6pm mostly cloudy, 60% cloud cover.
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Old 05-06-2020, 12:28 AM
Quopaz (Nick)
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Well that was amazing- I hope you guys got that! I missed the first half hour due to clouds, then they cleared! And the seeing was very good, for a while, then it deteriorated a bit. I started with the 2x barlow doing drift runs, had good views of the 2 shadows. I went till my hands froze then had to go and warm up. When I came back the red spot was coming into view as well, and I swapped to the 3x barlow. So there were 2 shadows and the red spot all at the same time. I'll get something but it will take me a long time to go through it all. Really wish I had tracking. My best views of Jupiter yet. Thanks Jeff!
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Old 05-06-2020, 11:52 AM
Saturnine (Jeff)
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Hi All
Well for once , when there was something not so frequent happening, we actually had clear calm conditions. Maybe too calm as the dew was dripping off everything and the seeing was not very good despite forecasts, typical of around here because of the topography.
Did manage to get a good look at the transits and to take some video but of course had tracking issues with the EQ6, I think that the 10' f6 newt is a bit more than the mount can cope with.
Watching the shadows glide across the disc and the moons disappear against the bright limb along with the Red Spot coming around the limb and traversing the disc as well was worth the effort and am looking forward to a few more in the coming months.
Certainly hope that everyone who made the effort enjoyed the show.

Quote:
Originally Posted by Quopaz View Post
Well that was amazing- I hope you guys got that! I missed the first half hour due to clouds, then they cleared! And the seeing was very good, for a while, then it deteriorated a bit. I started with the 2x barlow doing drift runs, had good views of the 2 shadows. I went till my hands froze then had to go and warm up. When I came back the red spot was coming into view as well, and I swapped to the 3x barlow. So there were 2 shadows and the red spot all at the same time. I'll get something but it will take me a long time to go through it all. Really wish I had tracking. My best views of Jupiter yet. Thanks Jeff!
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Old 05-06-2020, 06:23 PM
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Well, in Melbourne we had high clouds cover the sky last night, making high quality imaging impossible. I managed to grab some frames and turned them into an animation (see the Solar System Images forum), but it was a bit disappointing really.

Andrew
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Old 05-06-2020, 07:31 PM
Quopaz (Nick)
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I was hoping you'd get it and do one of them. Still pretty good and better than what I'll get. Bad luck about the high clouds, I think that's probably why my seeing got worse towards the end. Trouble I've got is with the drift method I can't get enough frames before it rotates. And if I take a 2 min video without drift, just keeping it in frame by hand, I get too much vibration. Have got a goto upgrade kit ordered that I hope will help, but haven't got it yet.
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Old 05-06-2020, 09:29 PM
glend (Glen)
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For those interested in the moons of Jupiter, there is a thread over on the Cloudy Nights forum, sort of an informal competition to see how many of them you can actually log. One post by IIS member Allan Wade, has him in the hunt to bag a seventh moon in the next couple of months with his 32" Black Widow Dob.

So how many have you actually observed, in total, ever?

https://www.cloudynights.com/topic/7...ian-satelites/

Of course imaging them should be far easier.
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Old 06-06-2020, 06:59 AM
Tropo-Bob (Bob)
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Quote:
Originally Posted by Saturnine View Post
Just for added interest, on the 6th June starting at 04:30 am there will be a not so common shadow transit of Callisto. One shadow transit may seem like any other to some people but it is a way of seeing the dynamics of orbital motion at play.
There will be a few more Callisto transits this planet season to whet the appetite too.
Thanks, I saw this about 5.30 and 6.20am. It was noticable how more slowly Callisto shadow moved compared with other shadow transists.

From memory, last year the shadow was missing Jupiter, so I expected the shadow to be very close to the poles. It kind of was, but nevertheless at a lower latitude than I was expecting.

I used my Vixen ED 81with 5mm Delite and 8 & 10mm Radians. This is a great grab and go scope to use when one is still half alseep.
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Old 06-06-2020, 12:44 PM
Saturnine (Jeff)
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I'm glad everyone is enjoying the shadow play on Jupiter, there are a few more Callisto shadow transits in the next few months so there is an opportunity to have another look. There are a few more double shadow transits as well this season.
I have several Gb of video of Callisto' shadow from this morning to process over the weekend, had better seeing this morning compared to yesterday so hopefully some better images as a reault.
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Old 07-06-2020, 12:01 PM
Saturnine (Jeff)
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For all those that are interested , there are double transits by Europa and Ganymede on the 12th and 19th and a Callisto shadow transit starting on the evening of the 22nd of this month. The Red Spot will also be transiting the disc while the double shadow transits are in progress.
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Old 13-06-2020, 07:49 PM
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Seeing was really bad for the shadow transits on the 4th (a few swear words may have been uttered, these opportunities are not too common with clear skies!), but improved a bit for an image after Io joined the party and Ganymede & Europa were transiting. It's a fun set of multiple transit/shadow events just now
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Old 13-06-2020, 11:26 PM
Saturnine (Jeff)
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Great image Andy, shouldn't expect anything less given your pedigree, pity the seeing wasn't better that morning. Picking up albedo features on the moons is a nice bonus though.
Clouded out down here for last Fridays transits but maybe we'll get lucky for the next installment on Friday morning the 19th Ganymede and Europa' shadows will briefly on the disc at the same time, for 40 mins, from 04: 33 to 05:13. The Red Spot will still be visible near the limb as well.
The weather forecast for that morning is not very comforting though.
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Old 18-06-2020, 10:23 PM
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Iíve had a good run of conditions this week to continue chasing the fainter moons of Jupiter. Last years opposition I managed to observe Himalia, Elara and Pasiphae.

Iíve been trying and failing for Amalthea for the last couple of years. Itís a very close orbiting moon that perhaps only 20 people have ever seen. Well I finally saw it on Monday for a 15 minute window while it was at max elongation from Jupiter. Took 619x and 808x to see it in the 32Ē.

I followed that with Carme and Sinope over successive nights. They are around magnitude 18. Still have Lysithea and Ananke on the list, but they are currently closer to 19th magnitude, and will brighten 0.5 magnitude over the next four weeks, so Iíll try for those right on opposition. So far I canít find any information indicating anyone has ever visually seen these fainter four moons.

So currently Iím at 10 Jovian moons and should get to 12, and Iím up to 27 solar system moons in all. Itís a good challenge if youíre looking for one.
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Old 28-06-2020, 02:21 PM
Tropo-Bob (Bob)
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In the days before Jupiter’s Opposition (14th July), shadows of its Moons appear on the disc before they transit. Around 7.30 tonight (28th June), Io’s shadow will be upon Jupiter’s disc, whereas Io does not begin to transit till around 7.40pm.

This order reverses after Opposition, so it is worth having a look at these events before and after opposition to gain a 3D sense of the alignments.
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