<< Previous Next >>

Sight-testing - Extreme Edition

Sight-testing - Extreme Edition
Photo Information
Copyright: Grzegorz Wieczorek (red45) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2636 W: 74 N: 9091] (31094)
Genre: Landscapes
Medium: Color
Date Taken: 2005-07
Categories: Sky
Camera: Canon Powershot S2-IS
Exposure: f/4.5, 2 seconds
Details: Tripod: Yes
Photo Version: Original Version
Theme(s): Heavens Above [view contributor(s)]
Date Submitted: 2005-07-25 3:52
Viewed: 3056
Points: 30
[Note Guidelines] Photographer's Note
Hi Folks!

And now time for something completelly different ;-) Sight-testing extreme edition - if you can spot Jupiter and its four moons you [or your monitor] are the best ;-) This is little tricky photo ;-) You can't write critiques like 'very good DOF' or 'amazing colours' ;-) But seriously - I like astronomy very much. Unfortunatelly I still haven't got any telescope so I can admire sky only with my binoculars. This picture was opportunity shot and test for my S2's astronomy abilities. Jupiter was well seen, with all its Galilean moons. Picture taken with 12x optical zoom. I hope you find it interesting.

The Galilean moons are the four moons of Jupiter discovered by Galileo Galilei. By far the largest of the many moons of Jupiter, they are visible even in a low-power telescope. In fact, if the observing conditions are perfect, it is just possible to see Callisto, the outermost, with the unaided eye.

They were first observed by Galileo on January 7, 1610. Galileo observed the moons' motion over several days and realized that they were in orbit around Jupiter. This discovery supported the heliocentric theory of Nicolaus Copernicus and showed that not everything revolves around the Earth.

Galileo first called his discovery the Cosmica Sidera, in honour of Cosimo II de' Medici (1590–1621), grand-duke of Tuscany from 1609, whose patronage Galileo wanted to secure. At the grand-duke's suggestion, Galileo changed the name to Medicea Sidera ("Medici stars"), because the Medici were four brothers (Cosimo, Francesco, Carlo, and Lorenzo). The discovery was announced in the Sidereus Nuncius ("Starry Messenger"), published in Venice in March 1610, less than two months after the first observations.

Amongst the other names that were put forward, there is Principharus, Victipharus, Cosmipharus and Ferdinandipharus, for each of the four Medici brothers, proposed by Giovanni Batista Hodierna, a disciple of Galileo and author of the first ephemerides (Medicaeorum Ephemerides, 1656). Johannes Hevelius called them the Circulatores Jovis or Jovis Comites, and Jacques Ozanam called them Gardes or Satellites (from the Latin satelles, satellitis: escort). It would be the names proposed by Simon Marius (Simon Mayer), who claimed to have discovered the moons at the same time as Galileo, that would eventually prevail: Io, Europa, Ganymede and Callisto, published in his Mundus Jovialis in 1614.

Galileo steadfastly refused to use Marius' names and invented as a result the numbering scheme that is still used nowadays, in parallel with proper moon names. The numbers run from Jupiter outward, thus I, II, III and IV for Io, Europa, Ganymede and Callisto respectively. Galileo used this system in his notebooks but never actually published it.

dew77, wallhalla15, bedford67, honza, coasties, sway, Janice, marhowie, Comandante, livios, Signal-Womb, PDP, sandpiper2, elizabeth has marked this note useful
Only registered TrekNature members may rate photo notes.
Add Critique [Critiquing Guidelines] 
Only registered TrekNature members may write critiques.
You must be logged in to start a discussion.

Critiques [Translate]

Wonderful presenatation. I'm wainting for more this kind of photos

  • Great 
  • dew77 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4432 W: 248 N: 4028] (13270)
  • [2005-07-25 3:54]

Hello Greg!
Wonderful,unusual work from you again.I liked your presentation and informative note very much.TFS...:-)

Hi Grzegorz,
It is not really common to see such photographs on this site! But the idea is interesting. I appreciate the note which accompanies this photo good framed.
TFS, cordially,

  • Great 
  • honza Gold Star Critiquer/Gold Note Writer [C: 533 W: 0 N: 720] (4197)
  • [2005-07-25 4:34]

Interesting presentation and excellent note. Itīs very difficult make photo of cosmic objects by camera without special instruments, but your picture is very good. TFS

Hi Greg

This is very different and very interesting. You have done a great job in capturing these so well. Interesting note too. Nice one! Thanks.

  • Great 
  • sway Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 305 W: 85 N: 319] (1276)
  • [2005-07-25 6:15]

Interesting compilation of shots.
I'll have to get the telescope out again!

  • Great 
  • sAner Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1455 W: 74 N: 1426] (4750)
  • [2005-07-25 6:46]

Hi Greg,

Well this is different! But I like it. Excellent note and well presented. On my work monitor I can only spot Jupiter and 1 moon ... Will take a 2nd look at home. Well done & TFS!


  • Great 
  • Janice Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3277 W: 148 N: 6163] (18832)
  • [2005-07-25 6:55]

I think I must be going blind Greg! But when I enlarge your photos I can faintly see some more marks. Good idea and great info for us to read, thank you. Well done.

Very interesting work Greg! An excellent supporting note, Great post!!

Hello Greg!
Very interresting shot and note.Excellent work!Thanks for sharing.

You're right - quite hard to critique.
"Superb POV" or "great BG" aren't rather proper as well ;-)
Anyway, as always very interesting POV with superb note and great presentation.
I like it very much.

  • Great 
  • livios Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2150 W: 319 N: 4263] (16942)
  • [2005-07-25 14:29]

Grzegorz, I like the experiment.

I'm also fascinated about astronomy, but, so far, I don't have an equipment to observe the heavens above.

Great idea. Well done.

Its been some time Greg since I got my big telescope out but this is a sight Iv seen many times and it always fills me with awe and wonder. I love to watch the Shadow of the moons pass over Jupiter, the changes in the belts and the ovals sometimes seen. I also look upon the satellites as little worlds in their own right. If I increase my brightness I can see these Galilean wonders. Very good post, well done.

  • Great 
  • PDP Gold Star Critiquer/Gold Star Workshop Editor [C: 2821 W: 344 N: 3779] (11769)
  • [2005-07-25 17:49]

I think Jupiter could do with a little selective sharpening and if you had a little more DOF you could have got Pluto in.

Good work Greg, interesting picture backed with a good note.

Amazing blackness, great POV :) :)
I didn't know you could see the names of the moons as well :) :)
The S2-IS looks like a prety awesome little camera, not to many compacts around that could even hope to take this type of shot.
Great note and an unusual presentation.

Calibration Check