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Showing posts with label Meteorite. Show all posts
Showing posts with label Meteorite. Show all posts

Sunday, July 26, 2020

Perseids Meteor Shower 2020 in Israel

The Perseids Meteor Shower peaks on the night of August 12 - early morning August 13 this year and every year. On a favorable year 60-75 meteors per hour can be seen during peak hours. 2020 is a mixed year for seeing the shower, partly because a last quarter moon rises at midnight and partly because of Coronavirus restrictions.

Peak hours are after midnight when the radiant of the shower rises higher into the sky and when the earth is turning into the meteor stream. A bright moon, which rises at midnight this August 12-13, considerably reduces the number of meteors seen since many meteors are dim. The moon is kind of like nature's light pollution. Nevertheless, the hours of dark before the moon rises should still be quite good. 

Perseids meteor shower
The meteors appear to emanate from a single location in the sky which gives the shower its name. This location is called the "radiant". 

Perhaps the most complicating factor this year is Coronavirus restrictions limiting groups to 20 in number. Because of Mitzpe Ramon's dark skies and the star parties sponsored by the town there are usually thousands of people who come to Mitzpe Ramon for the peak night. That obviously doesn't work well this year. All guided activities require a reservation and groups are being kept small. If you come without a reservation for an activity you are on your own for finding a dark location and observing. Many guides in Mitzpe will be doing their own scaled down tours throughout the week. You can find almost all on TripAdvisor. On many years Mitzpe Ramon has turned off all the city lights to make the area dark everywhere. It is not doing so this year.

If you come on your own the Machtesh will be open for star gazing and meteor watching at this location as well as all the campgrounds in the Crater. https://www.parks.org.il/reserve-park/ramon/
The Machtesh is enormous, some 29 miles x 6 miles and can accommodate thousands of people. 

This is your best bet for self-guided meteor gazing.

While my tour on the night of August 12 is booked, other nights around that date are still available. You can book one here:

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The Israel Space Association is offering free activities in Mitzpe August 8-13. Reservations are required. All I know about them is at this link: https://www.space.gov.il/activities-and-events/132025

You can obviously go to any dark sky location in Israel to view the meteor shower. I am not familiar with them but the Judean Desert, the Galil, and the Golan come to mind. Har Hatayasim nature reserve close to Jerusalem is a good candidate in the Mercaz. The devil is in the details which I don't know from lack of personal experience. 

The nights around the peak of the shower are also excellent for observing, you just don't see as many meteors. 

HOW TO VIEW THE PERSEIDS METEOR SHOWER

You don't have to come to Mitzpe Ramon to view the meteor shower. All you need is a dark sky with an open horizon. Just sit back or lie on the ground and look up. Watch the skies with your naked eye. No optical equipment required. While you can watch in any direction, looking east if you can't look straight up, is usually best, as that is the direction the radiant of the shower rises in the constellation Perseus, which gives the Perseids its name.

BOTTOM LINE:

The nights of August 10-August 15 are best for viewing this year's Perseids Meteor Shower. The peak night is August 12-13. A bright, waning, last quarter moon will interfere with seeing the dimmer members of the shower after midnight, which will considerably reduce the hourly rate. The nights of August  10,11, 13, 14 and 15 may be a good compromise between intensity and darkness for viewers of the shower. The moon rises about 45 minutes later each night after August 12. Check the forecast for haze on the nights of August 11-15. Haze combined with a bright moon do not make for good meteor viewing.

METEOR, METEORITE, METEOROID:

Meteors are what most people call "shooting stars" or "falling stars", but they are neither. They are bits of rock and debris from outer space that fall to earth and burn up from the heat of friction with the earth's atmosphere. It's their light generated by friction with the earth's atmosphere that we see. Usually these rocks from space just fall randomly so we only see a few per night. But sometimes the earth passes through the orbit of an ancient comet, which disintegrates as it orbits the sun and leaves a debris trail behind. As the earth passes through this cometary debris trail scores of particles fall to earth simultaneously creating a meteor shower. Really good showers like the Perseids can have peak rates in excess of 100 meteors per hour. Of course most of these are quite dim, but many bright ones are also visible creating "Ooohs" and "Ahhhs" from the onlookers. The Perseid Meteor Shower results from debris left behind by Comet 109P/Swift-Tuttle, whichh has a period of 133 years. It's last perihelion passage was December 11, 1992, so it won't be back for a while.

As the earth passes through  the orbit of an ancient comet debris rains down on our planet creating a meteor shower.

Most meteors are quite tiny, minuscule even, about the size of a grain of sand. Of course, we don't  see an object that small in the sky, we just see the tremendous light generated as they burn up from friction. They begin to become visible at heights of around 50 miles to 175 miles high. But sometimes enormous objects fall to earth. Most recently the Great Chelyabinsk Meteor fell to earth on February 15, 2013, over the town of Chelyabinsk Russia. It was 60 feet in diameter and weighed over 12,000 tons when it entered the earth's atmosphere at a speed in excess of 100,000 MPH. It was the largest meteor to fall to earth in over 100 years and was captured by numerous dashboard cameras. I put together a compendium of the videos on YouTube, and it is one of the most dramatic astronomical events of recent memory.  It is worth watching.  https://youtu.be/JB2eoQfOGBA

If meteors are large enough they can survive their fiery fall through the earth's atmosphere and hit the ground, as the Chelyabinsk Meteor did. They then change their name to meteorites and can be found, collected and researched. They are primordial pieces of the solar system, over 4 billion years old. The object while still in the sky is called a meteoroid.

I am often asked how much better the peak night is than the nights around it. Here's a graph of meteor frequency against the peak and the days around it. Of course this is the total number of meteors it is possible to see. We can't see them all since we can't see the whole sky at once and many are too dim to see under the sky conditions that may prevail. 

Meteor frequency against days of the month on and around the peak of the shower

Go out and enjoy the sky. Stay safe by observing Coronavirus restrictions.

Sunday, August 19, 2018

Review of the Perseids Meteor Shower Star Party

Well, the Perseids have come and gone for the year. The night was beautifully clear and dark. One of the best I have seen this year. The Alpaca Farm set up a wonderful location for the star party, dark skies and plenty of space to sit or lie down and watch the sky. About 100 people, including children, were in attendance. Ziv lead the Hebrew tour and I led the English tour. We were out from about 8:00pm to 3:00am. The meteor shower got off to a slow start, and we didn't start seeing lots until after midnight. But then the show picked up and we were sometimes seeing several every 10 seconds. But meteors fall in bursts, not continuously. I don't think we ever reached the maximum rate of 100 per hour but around 2:00am, near the peak time, we were probably averaging around 30 per hour. Most were short, bright bursts of light.

I held my meteorite raffle lots more than once per  hour, and many happy people went home with their own meteorites. I'm already looking forward to next year's show. In the mean time stay tuned for the next star party on December 13 (Thursday night) when the King of the Meteor Showers, The Geminids, peaks.

Perseids over Stonehenge


Tuesday, July 30, 2013

Perseids Meteor Shower Star Party!! August 11-12!!!

The ever-reliable Perseids Meteor Shower peaks this year on the nights of August 11 and 12. During those nights, and especially after midnight, the shower can show as many as 100 meteors per hour, although this is the maximum theoretical number. Realistic numbers are more in the range of 40-60 meteors per hour under very dark skies. This will be a good year for the meteor shower since the moon sets early in the evening leaving the sky dark all night.

There are a number of star parties where you can come and watch the event. The most crucial conditions for a good show are a dark sky and clear horizon. So, what better place to view it than the dark, desert skies of Mitzpe Ramon? Mitzpe Ramon will have its own traditional star party on Monday night-Tueday morning, August 12 and 13. This star party attracts thousands of people from around Israel. Last year over 9,000 people attended. Although this sounds like a zoo, it was actually quite alot of fun, and everything was quite orderly and joyful. This may be the largest star party in the world. And if you've never heard 9,000 people cheer when a fireball flashes overhead, well, you've never lived.

If you want something a bit more intimate, on the previous night, Sunday, August 11 through the morning of Monday August 12, I will be hosting my own star party in conjunction with the Desert Shade Eco-Lodge in Mitzpe Ramon. I will be doing both naked eye and telescope star shows throughout the night until after 1:00AM, after which we can all sit back and watch the sky blaze with meteors. I will also be showing my video of the great Chelyabinsk Meteor that fell over Russia on February 15 of this year, cutting a huge swatch of destruction in its wake. To complement the video I will have a "show and hold" presentation of actual meteorites from space, including a genuine piece of the Chelyabinsk meteorite. The "piece de resistance" of my collection is a piece of the actual "Tohu va'Vohu" (See Beresheet 1:2) from which our solar system began over 5 billion years ago. It's more fun than a freak show and alot kinder to the children! We will also have a campfire around midnight and all the tea you can drink. Admission includes camping all night as well as use of the bathroom facilities. Bring your own sleeping bags, tents, camprolls, etc.

EVENT
What: Perseids Meteor Shower Star Party
When: Sunday night through Monday morning, August 11-12
Where: Desert Shade Eco-Lodge Mitzpe Ramon
Activities: Naked eye and telescopic star tours by Ira Machefsky, the Starman of Mitzpe Ramon; All night camping included in price of entry; Movie of the Great Chelyabinsk Fireball that crashed over Russia on Feb. 15 of this year; "Show and Hold" presentation of actual Rocks from Space together with the most primitive meteorite ever discovered, a piece of the "Tohu va'Vohu" of our world; Camp fire; and of course meteor watching all night long.
Language: English
Admission: 80nis per person, includes all night camping privileges, hot tea all night, bathroom facilities, camp fire, all presentations.

Upgrades: Price for star tour & over night in dorm eco tent  125 Nis per person
Price for star tour & over night in private eco tent  165 Nis per person ( MIN 2 PAX PER ECO TENT)

Vegetarian food will be available  to purchase.

Optional  sun rise jeep desert safari  for just 240 NIS  

For more details & reservation
Reservations Required: info@desert-shade.com






A meteor shower occurs when the earth in its orbit around the sun encounters the orbit of an old comet. Comets slowly disintegrate as they orbit the sun, leaving behind a trail of cometary debris that consists of varying size rocks, dust and debris. When the arth encounters this material, it enters the earth's atmosphere at very high speed where friction causes it to burn up. The fiery remains are seen as meteors in the sky. The larger the debris, the brighter the meteor. The Perseids Meteor Shower is the result of the earth encountering the orbit of Comet Swift-Tuttle.


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Friday, February 15, 2013

OMG!!! Giant Meteorite Strikes Russia! 500 people Reported Injured!!!

On the day of the close passage of asteroid 2012 DA14, a giant meteor was seen creating a fireball above the town of Chelyabinsk, Russia in the Ural mountains 950 miles east of Moscow. Five hundred people were reported inured, mostly by flying glass, so far none seriously, as it exploded in the skies above town and crashed to earth nearby.

This is the third time in a little more than 100 years that Russia has been struck by a gigantic meteorite or comet/asteroid. In 1908 a huge comet, some think asteroid, obliterated a large Siberian forest, the Tunguska Event. In 1947, the largest witnessed fall of a meteorite in modern times occurred in the Sikhote-Alin mountains of eastern Siberia, dropping over 100 tons of meteoritic material, and now this event on Feb. 15, 2013, size as yet unknown. This will be a field day for meteorite hunters and scientists. One cannot help but speculate that this event is connected to the close passage of asteroid 2012 DA14 happening later tonight. It seems too odd to be a coincidence, but lots more work remains to be done.

In the mean time, treat yourselves to this compilation of dashboard videos that show the giant meteor as it passes over Chelyabinsk, Russia.



   A straight-on view as the meteor roars overhead, followed by earth shattering explosions.



Compilation of dashboard videocams.


 Huge explosions in this video!



  Student video near university with huge explosions and glass breaking everywhere.


A photo of the Russian meteor fireball as it crashed to earth in Russia on Feb 15, 2013 in Chelyabinsk, Russia.

The Sikhote-Alin meteorite fell on February 12, 1947, strikingly close in time to the fall of today's meteorite, and not that far away in the Sikhote-Alin Mountains of eastern Siberia. There were not many cameras around then, but the fall was witnessed by a nearby artist, P.J. Medvedev, who painted a picture that was reproduced in a Soviet Union stamp issued 10 years later to commemorate the event. Much was learned about meteorites from that fall, and even more will be learned from today's.

The Sikhote-Alin meteorite fall of February 12, 1947 was commemorated 10 years later on this Soviet stamp. The artist lived nearby and painted this picture as he witnessed the event. 
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