20 replies to this topic

[Dave Mitsky]

01:14 UT, Ganymede's shadow leaves Jupiter's disk.
02:14 UT, Europa's shadow leaves Jupiter's disk.
02:34 UT, Io exits eclipse by Jupiter's shadow.
20:12 UT, Io begins transit of Jupiter.
21:32 UT, Io's shadow begins to cross Jupiter.
22:26 UT, Io ends transit of Jupiter.
23:48 UT, Io's shadow leaves Jupiter's disk.

https://skyandtelesc...cript-utility/#

[Lentini]

Went out and caught it randomly. Actually I was a bit early, but since only two moons were visible, I looked at Sky Safari to see if they were on front of or behind the planet.

Saw Europa was in front (was able to see it right before it came off the limb), but also saw there was the double transit.

Stayed out to try to catch it. I was using my TS-80 at first, and saw the first shadow. But the second was difficult, so I switched to TSA-120. Seeing must have been bad, as the shadows would disappear for seconds at a time. But persistence got a few seconds of viewing both. At one point, a jet and its wash went right over Jupiter. Not helpful! Lol.

Also not helpful were my companions. At least not the cat, who kept rubbing on the tripod.

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[rjacks]

It looks like maybe a quarter of CONUS (a strip from LA [the city] to central LA [the state]) has clear skies right now. Sad. 

[Lentini]

The TS-80 pointing at Jupiter.

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[donniesoprano]

All clouds here in Atl.

 

ds

[Jethro7]

All clouds here in Atl.

 

ds

DITO, in NW Florida.

 

KEEP LOOKING UP Jethro

[Dave Mitsky]

I'm currently at the Naylor Observatory. If I had checked for Galilean events earlier in the day, I would have come here before the transit began and observed the event with observatory's 17" classical Cassegrain.

I had to settle for my "quick look" 6" Apertura AD6 from my driveway. I used magnifications of 150, 171, and 200x. I don't think I ever saw both shadows but my wife said she caught both of them fleetingly. At any rate, I definitely saw Europa's shadow.

[quilty]

Double shadow is quite an exeption. I had it just once.

[12BH7]

If you can believe it, Arizona is clouded and expecting rain. I hope it does!!!!

[Spikey131]

I just happened to check Sky Safari yesterday after work and saw the double transit occurring just after sunset.  So I was able to get the 5” refractor and binoviewers out to view the whole event.  Jovian moon transits are among my favorite things to observe, and this was a good one!

 

 

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[Lentini]

It looked on Sky Safari like Io would come out from behind the planet within Jupiter's shadow, and would suddenly appear well off Jupiter's edge.  Did anyone stick around and witness that after the shadow transits?

[sudhashn]

Has anyone observed the half-lit (or partially lit) Io or Ganymede when they exit Jupiter's shadow?

 

They are 1" & 1.4" in apparent size. They must be pretty difficult to view.

 

What combo of parameters are required to observe them? Aperture, Magnification, and?

[Dave Mitsky]

Has anyone observed the half-lit (or partially lit) Io or Ganymede when they exit Jupiter's shadow?

 

They are 1" & 1.4" in apparent size. They must be pretty difficult to view.

 

What combo of parameters are required to observe them? Aperture, Magnification, and?

I've watched a number of eclipse events over the years with various apertures up to 17 inches and have never been able to make out more than a gradual brightening or darkening of the Galilean satellite undergoing the process.

[goldenraccoon]

What aperture would you need to see this visually (the shadows in particular, cast on Jupiter)? And could you potentially capture it through video and stacking on a smaller aperture telescope? I have a 5SE… and unfortunately do not have clear skies. 

[quilty]

Has anyone observed the half-lit (or partially lit) Io or Ganymede when they exit Jupiter's shadow?
 
They are 1" & 1.4" in apparent size. They must be pretty difficult to view.
 
What combo of parameters are required to observe them? Aperture, Magnification, and?

My guess is negative.

1. short moment
2. large aperture necessary like 12"+ to find more than just a brightness gradient.
3. very good seeing necessary
4. how sharp is Jupe's cloudy edge with respect to the tiny moons?

And last not neast it seems to be impossible geometrically. I've never seen a moon switching its light off right before it disappeared behind Jupe

Edited by quilty, 08 March 2025 - 09:45 AM.

[Lentini]

Another double shadow transit coming tonight. Anyone going to watch? I’ve got a Mewlon 210 cooled and ready to go.

[Spikey131]

I just watched the ingress of Europa, the egress of Ganymede and the occultation of Io.  All with the GRS transiting.

 

Expecting Europa’s shadow to appear in an hour and Ganymede's about 30 minutes later.  All kinds of action on Jupiter tonight!

[Lentini]

When I first went out to see the shadows, I saw the larger one immediately… seemed easy, but the longer I looked for the smaller shadow, the less I could see the larger one. Eventually I couldn’t see either! Granted, Jupiter was getting low, but not that low. Maybe my conditions were deteriorating. More moisture for sure, but I was surprised.

[Spikey131]

Both shadows were on the planet until 1 AM.

 

Europa’s shadow is small and dim an often difficult to see.

 

But I think if you started having trouble seeing both of them, the trouble was the atmosphere, and Jupiter was getting low in the sky.

 

There is something special about Jovian lunar events for me.  Sometimes I just sit back, look up at the sky, and realize that I am sitting on the third rock from the sun, gazing out across millions of miles, and watching the dance of the spheres.   What a blessing and a privilege to be able to do that.

[quilty]

Went out and caught it randomly. Actually I was a bit early, but since only two moons were visible, I looked at Sky Safari to see if they were on front of or behind the planet.

Saw Europa was in front (was able to see it right before it came off the limb), but also saw there was the double transit.

Stayed out to try to catch it. I was using my TS-80 at first, and saw the first shadow. But the second was difficult, so I switched to TSA-120. Seeing must have been bad, as the shadows would disappear for seconds at a time. But persistence got a few seconds of viewing both. At one point, a jet and its wash went right over Jupiter. Not helpful! Lol.

Also not helpful were my companions. At least not the cat, who kept rubbing on the tripod.

you should better teach them astronomy. I guess both your friends look into wrong direction

Boxers are smarter



No, they aren't

Edited by quilty, 12 March 2025 - 08:29 AM.

[Dave Mitsky]

I caught the end of a shadow transit by Io tonight using the Naylor Observatory's 17" classical Cassegrain at 170 and 216x.

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