84 replies to this topic

[KiwiRay]

The sky cleared here around 1:40 am (UT 08:40), and I captured six recordings under not great conditions. If that faint smudge is all there is, then there's no hope I captured anything. I stopped at 2:10 as seeing got worse and I expected the ring shadow transit to end at 2:15, but if it was in the wrong place, then it may still be going on.

 

AS!3 just finished the first recording - better image than I expected, but no sign of a shadow. Time to go back to bed.

[Tulloch]

Hopefully we get more luck as it crosses the disc...

[Ethan Chappel]

Yeah, this is with the EdgeHD 14. Not sure it would've been visible in any scope smaller than an 11" in good seeing, but it will probably be easier when the shadow reaches the planet later.

 

Going to call it quits for my time-lapse now. Scope is nearly hitting the mount and the seeing has gone downhill.

Edited by Ethan Chappel, 17 July 2022 - 04:40 AM.

[Tulloch]

Yeah, this is with the EdgeHD 14. Not sure it would've been visible in any scope smaller than an 11" in good seeing, but it will probably be easier when the shadow reaches the planet later.

 

Going to call it quits for my time-lapse now. Scope is nearly hitting the mount and the seeing has gone downhill.

Still a great catch, may up better with some harder processing - but sounds like you captured a world first! 

[Sunspot]

This is one event that definitely benefits from an animation. 12 years ago I was happily surprised how well they showed up when animated.

[Tulloch]

I got some clear skies, but after some quick processing I can't seen any shadows with my C9.25.

[John Boudreau]

I’m currently imaging the shadow transit on Saturn’s ring and am wondering if WinJUPOS has the shadow in the wrong place while it is over the rings. I do not see any dimming on the far side of the ring, but I do see what looks a slow-moving faint smudge in about the same place on the near side.

I also saw and thought the same thing Ethan. My seeing conditions were only good enough for R and IR at the time and I was dealing with passing clouds. The smudge moved along the edge of the A ring from the southern following side --- it's path looks like it lines up nicely with what WinJUPOS predicted for the shadow transit across the disc, but not the WinJUPOS pre-09:10 UT path shown on the top of the A ring. I only woke up an hour ago after a long imaging session. I'll have to do some processing today.

Edited by John Boudreau, 17 July 2022 - 10:13 AM.

[dcaponeii]

We had thin clouds this morning and I wasn't out because I did my maths wrong and thought the event was overnight tonight not last night when I was sleeping!!!  I was pretty bad when I happened to look out on the way to the can around 1am.

 

EDIT:  The above statement about me having missed it is NOT correct.  I can still get the last half tomorrow morning early.

Edited by dcaponeii, 17 July 2022 - 10:59 AM.

[KiwiRay]

I got some clear skies, but after some quick processing I can't seen any shadows with my C9.25.

Yeah, I got nothing. Even in ideal conditions, I doubt we'd have resolved what Ethan captured. I can't even be sure the shadow was still on the rings when I was imaging, given the error in the WinJUPOS prediction. I expect data from Ethan and hopefully others can be used to improve estimation of Iapetus' orbit.

[KiwiRay]

We had thin clouds this morning and I wasn't out because I did my maths wrong and thought the event was overnight tonight not last night when I was sleeping!!!  I was pretty bad when I happened to look out on the way to the can around 1am.

 

EDIT:  The above statement about me having missed it is NOT correct.  I can still get the last half tomorrow morning early.

Right. This morning was the shadow transit, but the moon itself will transit tonight. From Darryl's images, that should be easier to detect.

[dcaponeii]

Right. This morning was the shadow transit, but the moon itself will transit tonight. From Darryl's images, that should be easier to detect.

Unfortunately what Daryl can do usually has little predictive value for what I can do. Weather isn’t looking good at the moment

[Quopaz]

I just finished filming. Had quite a few clouds go through but with some big
clear patches too. Was calm when I started then the wind came up, then dropped off
again. Struck a bit of a patch of good seeing. Couldn't see any shadow on the live feed
will have to see if it shows up after processing. Probably won't get to process till
tomorrow night.

[Ethan Chappel]

Started stacking my 56 recordings for real just before bedtime this morning and still have 4 left. I've been looking for the shadow of Mimas in my early images, but seems like it was out of reach this morning.

 

BTW, everyone with WinJUPOS should go to 2025-04-29 from 06:00-21:00 UTC. You will know what I mean when you see it.

[John Boudreau]

Started stacking my 56 recordings for real just before bedtime this morning and still have 4 left. I've been looking for the shadow of Mimas in my early images, but seems like it was out of reach this morning.

 

BTW, everyone with WinJUPOS should go to 2025-04-29 from 06:00-21:00 UTC. You will know what I mean when you see it.

Ah yes! lets hope that occurs just as WinJUPOS depicts it!

 

Thanks for the head's up. I can see doing some traveling for clear skies with that one! 

[KiwiRay]

25-04-29 looks pretty cool, but given how low Saturn is before sunrise here, I'll probably have to wait for less exotic Titan transits later in the year.

 

Good luck to everyone for tonight!

[Ittaku]

I managed to capture the shadow last night with a C11. It's just to the right of centre, immediately under the ring.

 

 

Taken on 2022-07-17 1434 UTC.

 

More captures including infrared which shows it more clearly, and my full post here:

https://www.cloudyni...urn-2022-07-17/

Edited by Ittaku, 18 July 2022 - 01:24 AM.

[Lacaille]

This is really exciting and interesting, but it would be helpful to get the precise UT times and dates as people post images (Spoiler alert: it was cloudy in Canberra last night - nothing coming from me!). 

 

I am getting confused by what seem to be discrepancies between images posted, the prospective WJ timings discussed earlier, shadow transits vs moon transits, and trying to relate WJ graphics and the shadow coordinates under the WJ "Moon Coordinates" tab which show the shadow transit beginning at around 09:46 UTC on 17/7. It really would help to get timings from the images if you wouldn't mind.

 

Regards

 

Mark

[Ittaku]

This is really exciting and interesting, but it would be helpful to get the precise UT times and dates as people post images (Spoiler alert: it was cloudy in Canberra last night - nothing coming from me!). 

 

I am getting confused by what seem to be discrepancies between images posted, the prospective WJ timings discussed earlier, shadow transits vs moon transits, and trying to relate WJ graphics and the shadow coordinates under the WJ "Moon Coordinates" tab which show the shadow transit beginning at around 09:46 UTC on 17/7. It really would help to get timings from the images if you wouldn't mind.

Added time to posts, good idea.
 

[Foehammer]

Greetings from Cyprus!

I'm still imaging at the moment with the C9,25

Saturn passed the meridian at 39d for me and is now descending. Seeing is poor so im using a 642nm and the asi462 to push my chances. Blinking through stacks taken at 10 min intervals I *think* I have captured Iapetus as it is now transiting the disk.

[Sarciness]

Possibly not surprising, WJ is the only software package that predicts the moon shadow at all, and there's no real previous data for a comparison - your observation could be a world first! 

 

Saturn doesn't rise here for another few hours and it's cloudy and raining, keep up the good work

 

Andrew

 

Attached Thumbnails

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[Sarciness]

Sorry, replying on mobile is a bit janky and it won't let me edit. The above is a screenshot from Stellarium for Android, showing the shadow transit.

[Ethan Chappel]

Sorry, replying on mobile is a bit janky and it won't let me edit. The above is a screenshot from Stellarium for Android, showing the shadow transit.

Does it show a shadow on the rings though? That is where most software falls short in my experience.

 

 

Cartes du Ciel show the shadow on the rings, and even got the position correct too.

 

[KiwiRay]

Luc Dauvergne is capturing the Iapetus transit:

 

https://twitter.com/...2955008/photo/1

[leoyasu]

I'm making some coffee to wait the clouds to pass:

 

[Ethan Chappel]

I was worried about tonight's weather, but looks like I get to double-dip on Iapetus events!

 

Now the moon itself is transiting Saturn. Seeing so far has been much better than last night.

 

2022-07-18 07:13 UTC