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The Cassini Spacecraft orbiting Saturn continues to give us unique views of the Solar System. Today's exhibit is a unique eclipse of Saturn's Moon Mimas (also known at the Death Star Moon) by the Moon Enceladus.
You don't see Enceladus...just its shadow! Enceladus is off the screen. This animations was made from 7 images snapped 30 seconds apart, so the event didn't last long at all. Cassini was about 800.000 miles away when it snapped this sequence of images.
These eclipses can only occur near Saturn's equinox. Most of the time the orbits of Saturn's Moons are tilted with respect to the Sun so their shadows will pass above or below each other. Only near the equinox (which occurs in August for Saturn) will they line up just right so they can eclipse each other. Neither of the Voyager Spacecraft passed Saturn close to an equinox so this is the first time we have been able to see events such as this.
You can find some nice animations of the shadhows of Moons cast on Saturn's rings as well.I was catching up on podcasts at the gym this morning and listened to the most recent episisode of Radio Lab on stochasticity. Stochasticity is fifty cent word for randomness. Most people think they know random when they see it, but frequently find patterns where there is really randomness.
The show starts off with a very interesting story about a young girl letting go a balloon with a note tied to it. It is found and, at first, the commonalities she shares with the girl who found it seem extraordinary...but only if you look at the things they have in common of course. A quick examination of their differences makes you wonder a bit more.
They discuss one of my favorite games I did with students occasionally. They do it with two groups but I would do it with 5-7 depending on class size. The game is you give one group a coin. You tell them to flip it 10o times and write down the series of heads and tails (using h and t). The other groups are just to write down (what they think) is a random series of h's and t's without flipping the coin. I leave the room so I don't know which group has the coin. I then come back a few minutes later when they are done and tell them which group was flipping a real coin based on their sequences. What they think is a random sequence has easily recognizable differences from a real random sequence. I am going to make you listen to the episode to hear one way of doing this (they don't reveal all the tricks, but the others are similar to the one they use).
We are programmed to see patterns. That served us well when we were dodging tigers, but now we can see patterns where there are none. From an evolutionary standpoint, we not recognizing a tiger attack results in death and a false positive results in a change of underwear at worst. Therefore, we tend to have a lot of false positives when it comes to recognizing patterns.
We see everything from the face of Jesus on a tortilla to Elvis in the Eagle Nebula (recognizing faces has its whole own subcategory). Gamblers think they recognize patterns (reinforced by bells and flashing lights) that keep them gaming. They have an interesting statistical analysis of athletes who get the hot hand and find it usually isn't as hot as you think it is.
People base their lives on patterns that don't exist. Everything from who they date and marry to their stock market picks and the lottery tickets they buy. We all could use a little better understanding of statistics and how to pick out meaningful patterns.It was cloudy for the nice conjunction yesterday, but it was still pretty good this morning (click to embiggen)
The crescent Moon is obvious with Earthshine. Venus is very prominent with Mars slightly to its upper left. You might have to click for a larger version to detect Mercury almost directly below the Moon (it is hard to see at this resolution, but the full picture is a pretty big file). The Moon was very close to the Pleaides, but I got up too late and the sky was too bright to get a good shot of them together.
"The Racine Raiders kickoff their 57th season of play Saturday against the Leyden Lions of the Mid-States Football League (MSFL). The game will begin at 7:00 p.m. at Ralph 'Babe' Serpico Memorial Field in Melrose Park, Ill.
The world is full of them.
There's a nice story with a Racine slant in the Journal Sentinel Online about trapping and selling crayfish: http://www.jsonline.com/news/wisconsin/48567227.html.UPDATE: Well, a lot of use were clouded out today. Tomorrow is a different arrangement by worth trying. The Moon will be over near the Pleiades tomorrow morning. Venus and Mars will still be very close together. The Moon will be even lower in the sky Sunday morning, but will provide a useful guide to find Mercury. Mercury will be almost directly south (to the right) of the Moon Sunday morning. Don't give up quite yet...still some interesting sites to see!
Conjunctions of planets and the Moon happen on a fairly regular basis. The players, however, are constantly changing and we get different combinations at different times.
Tomorrow morning, June 19th, we get a nice trio before dawn. This trio will consist of the Moon, Venus and Mars. The Moon is a waxing crescent. If you have binoculars (or a telescope) train them on Venus and you can see its phase as well! Venus is about half lit right now and even a modest pair of binoculars reveals its phase. Mars is not nearly as bright, but should be easily visible between the Moon and Venus. Mercury rises right beneath the Pleaides later (exact time depends on where you are) but it will probably be very difficult to see in the pre-dawn glow.
This should be particularly nice rising over Lake Michigan!
Here is the sky chart for tomorrow morning...click to embiggen.

The Lunar Reconnaissance Orbiter (or LRO). It will go into orbit around the Moon with a suite of instruments to measure temperature, gravity, and UV albedo. That may not sound exciting, but the really cool part is it will have a very high resolution camera (almost identical to the one on the Mars Reconnaissance Orbiter) that will be able to take pictures with a resolution as fine as 18 inches...the pictures from this are going to be spectacular! LRO will be searching for good landing sites with an emphasis on the polar regions, a likely spot for a lunar base.

"DUBLIN: Thousands of James Joyce fans Tuesday cast aside worries about recession in Ireland to recreate Bloomsday, the fictitious day at the centre of the author’s most famous novel, ‘Ulysses.’"↓