5 replies to this topic

[CHnuschti]

Interesting eclipse of Ganymede (on Jupiter) Jan. 31 in Europe

 

Well observable, disappearing around 17:00 CET. It's all far out, position of the Earth in respect to Jupiter is near at its "angular" limit (that should be around mid coming march), giving this odd looking eclipses.

 

What is the correct astronomical term for that position, where the phase angle (earth-planet-sun) is at its maximum?

And are there some online calculation tools to see the actual values? Thanks.

 

One Ganymed orbit last approx. 7 days, so those eclipses can repeatedly be seen now, surely there is a observation window for every place on earth.

 

regards

 

EDIT: Skysafari is off by some minutes, as I experienced, showing the proper time of disappearing and reappearing. Better include some margin when looking at it.

 

Edited by CHnuschti, 29 January 2025 - 03:42 PM.

[Avocette]

The apparent error in timing may be because you have not switched on Light Time in the Precession options in Settings:

 

[CHnuschti]

Again, no it is not that issue. The issue is some lack of preciseness.

regards

[MrSyzygy]

If anyone is interested in the exact timing, disappearance is at 16:27.1 UTC and reappearance is at 18:51.3 UTC according to IOTA [Occult 4.2025]. Add one hour for Central European Time (CET).

[quilty]

Sorry, to me moon eclipses by Jupe is not too breathtaking.

[CHnuschti]

And are there some online calculation tools to see the actual values? Thanks.

 

Found a site finally. The term is " quadrature ". Wiki.

https://eco.mtk.nao....henomena_en.cgi

 

Timepoint of maximum phase for the outer planets. Also the timepoint with most inclined shadow throw of the planet (or close to at least), resulting in this far out eclipses on Jupiter and/or the maximum shadow on the rings of Saturn

 

regards
 

Edited by CHnuschti, 27 February 2025 - 05:41 AM.