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Europa Will Be Eclipsed on Friday Morning

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#1 Dave Mitsky

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Posted 08 July 2021 - 12:25 AM

Europa will disappear into eclipse starting at 3:26 a.m. EDT on Friday.

Friday, July 9, 2021

07:26 UT, Europa enters eclipse by Jupiter's shadow.

 

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


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#2 phillip

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Posted 09 July 2021 - 03:07 AM

Is there a way the app tells dates in advance on these? 

 

Missed this mornings, Bummer!

 

Thanks in advance ! 


Edited by phillip, 09 July 2021 - 03:21 AM.


#3 vdog

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Posted 09 July 2021 - 08:27 AM

Io and Europa were both eclipsed for a while this morning.  First time I've seen two of the moons in eclipse simultaneously.  



#4 JOEinCO

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Posted 09 July 2021 - 09:08 AM

Io and Europa were both eclipsed for a while this morning.  First time I've seen two of the moons in eclipse simultaneously.  

 

Eclipsed by the shadow and then occulted by Jupiter itself, I believe. I think that's why they were "gone" for so long this morning.


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#5 vdog

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Posted 09 July 2021 - 09:41 AM

Eclipsed by the shadow and then occulted by Jupiter itself, I believe. I think that's why they were "gone" for so long this morning.

So that's why Io so suddenly disappeared.  I thought that it wasn't close enough to be eclipsed by the planet so quickly.  It was like I looked away once and it was gone.



#6 JOEinCO

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Posted 09 July 2021 - 10:09 AM

Terminology break: 

  • A shadow eclipses a target. 
  • A solid body, planet or moon, occults a target.

The Galilean moons are occulted at the same rate they are eclipsed. They are both the result of the moon's orbit around Jupiter. In one case it's moving into a dark circle the size of Jupiter, in the other it's moving behind a bright disc the size of Jupiter. Any perceived difference in how fast they disappear under either circumstance is an optical illusion.



#7 SeanStaresatStars

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Posted 09 July 2021 - 11:58 AM

Saw Europa go into the shadow this morning in my 15x70s, first time I've seen one of the Galilean moons go into eclipse. Europa could just barely be seen in the glare from Jupiter just before but then I could see it just fade out and disappear.


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