Comments on: Perseids, writ large

By: Chip

Chip — Thu, 27 Aug 2009 02:15:21 +0000

Jeff – Thanks for the good advice.

I think my experience outdoor observing meteors appearing very briefly misled me into thinking the video was close to real time.

By: Jeff Sullivan

Jeff Sullivan — Wed, 26 Aug 2009 18:50:31 +0000

Chip,

Bear in mind that this is a timelapse video, so in playback as video everything is dramatically sped up. Each frame is a 30 second shot, but the video is assembled at a relatively slow frame rate of only 12 shots per second. In other words, each second of the video displays ten minutes of shooting time. Apparently our eyes and minds are quick enough for us to perceive the meteors with some persistence even though they show up for only 1/12th of a second.

Anything that travels across the screen or survives in the video for more than a brief flash is a jet or satellite (and you can’t see many of the meteors in most online copies of the video, unless you follow the links to Flickr and enable the highest HD playback available there). I’ll try to find video hosting sites that enable blogging of copies that offer higher resolution playback, preferably full 1920 x 1080 HD. I’ll also try to find some nice background music avalable under the Creative Commons CC-BY license (which does not seem to be a trivial search).

Jeff
http://www.MyPhotoGuides.com

By: Jeff Sullivan

Jeff Sullivan — Wed, 26 Aug 2009 18:27:55 +0000

To add a bit more science context to this annual event, debris from the Comet Swift-Tuttle in its previous passes through the earth’s orbit causes the annual Perseid Meteor Shower in early August. Events such as this may be tied to the appearance of life on this planet. More than seventy varieties of amino acids have been found in meteorites, and tests imply that they may withstand impact events:
Hitchhiking Molecules Could Have Survived Fiery Comet Collisions With Earth
There was a talk recently at U.C. Berkeley on how material from space has influenced life on earth:
Astronomy and Evolution: From the Death of the Dinosaurs to the Stardust in your Bones

Jeff Sullivan
http://www.MyPhotoGuides.com

By: Chip

Chip — Wed, 26 Aug 2009 18:18:08 +0000

At the very beginning of the clip, moving too fast for a banking jet, is the image of a Perseid seeming to turn an optical illusion?

By: Lazlo

Lazlo — Wed, 26 Aug 2009 15:36:17 +0000

Aaah, the moon makes a lot more sense. Nicely done!

By: Jeff Sullivan

Jeff Sullivan — Wed, 26 Aug 2009 09:41:52 +0000

Thanks for the great reponse to my video. I shot this timelapse sequence at an elevation of 10,000 feet in the White Mountains on the California/Nevada border. The bright object which rises orange on the right side behind the smoke is the moon.

The video was assembled from 124 still images taken on a Canon 5D mark II camera over the course of an hour.

As noted, the best way to see the meteors falling vertically and to tell them from the airplanes (most flying horizontally) and the satellites is to go to the video on my Flickr photostream and ensure that you enable the HD display: http://www.flickr.com/photos/jeffreysullivan/3844899922/

I’ll try to post technique notes on my blog shortly, after I complete more of my timelapse videos from the Perseid event.

Jeff Sullivan
http://www.MyPhotoGuides.com

By: Lazlo

Lazlo — Wed, 26 Aug 2009 09:16:35 +0000

After further research (okay, basically hacking around in Stellarium), given where all the constellations are in the sky when the sun rises, I don’t see how this could have been shot any later in the year than early May or so. Anyone else want to check my work on this?

By: Lazlo

Lazlo — Wed, 26 Aug 2009 08:22:14 +0000

The Flickr page says it was shot in the eastern Sierras. But Andromeda isn’t anywhere near that position in the sky during the summer, is it?

By: BigHeathenMike

BigHeathenMike — Wed, 26 Aug 2009 01:13:47 +0000

Man, this is great. I wish I could get it on a loop to have as a screen-saver. Thanks for the clip, Phil!

By: cpt Jameson Lave de Reorte

cpt Jameson Lave de Reorte — Tue, 25 Aug 2009 20:01:46 +0000

In Holland we had a display of a ‘big’ meteor in the skies that was seen from many places.

By: Laura

Laura — Tue, 25 Aug 2009 18:31:20 +0000

This is awesome. It was cloudy for the two prime viewing nights where I live so I didn’t catch ‘em. Not that I could literally catch them. Ouchies.

By: fluffy

fluffy — Tue, 25 Aug 2009 18:06:02 +0000

Growing up in a not-yet-light-polluted area of New Mexico, I loved my annual Perseid viewing with my dad in the back yard. I haven’t even seen the stars in years, though, ever since I moved away… even when I visit home, there’s far too much light pollution in my parents’ neighborhood.

I feel like we as a species are getting disconnected from the rest of the universe, and that we’re running the risk of losing our sense of wonder about what else is out there. The night sky has turned into a niche interest, and that makes me sad.

By: Chambo’s Internet Activity Pages for August 25, 2009 | ARTHUR MAGAZINE - WE FOUND THE OTHERS

Tue, 25 Aug 2009 17:58:23 +0000

[...] • GREAT BALLS OF FIRE: Did you miss the Perseid meteor shower peak-hour blowout that happened back on August 12? We went camping up on Mount Pacifico here in the Southern CA San Gabriels the weekend after and caught a couple fleeting shooting stars, but the main event was completely obscured by the impenetrable orange-grey dome that covers the Los Angeles sky each night. Luckily this “Jeff Sullivan” guy on Flickr recorded a good portion of the night with his HD camera. Click here to go to his page and watch it in full-screen mode. [via Bad Astronomy/Discover] [...]

By: Spiv

Spiv — Tue, 25 Aug 2009 17:53:34 +0000

Tony, Richard: In places where it is very dry and/or high altitude the stars are visible for much longer in to the morning. Might explain how far in to dawn this video goes. Anyone know where the images were taken?

(I’m in Florida, there’s so much wet atmosphere here it’s hard to make out the milky way at midnight on the clearest of winter nights without some gear).

By: Len

Len — Tue, 25 Aug 2009 17:32:11 +0000

Love it.
My favourite part of this vid is seeing the milky way move across the sky, it gives it a (probably false, but still beautiful) sense of depth. There was a similar video posted a few weeks back.
If anyone has any links to similar stuff i’d apreciate it.

By: Tony

Tony — Tue, 25 Aug 2009 17:27:27 +0000

Something not right here as Richard noted. Not only can you see stars but also The Milky Way after sunrise. Not in my experience on this planet. Two videos superimposed. I think the meteor sequence was taken well before sunrise, the radiant being fairly low, and sunrise added later. I saw the Milky Way once from Queens New York. It was during the blackout of 1977. Nice video anyway.

By: Kevin

Kevin — Tue, 25 Aug 2009 16:25:17 +0000

Man, very awesome. Wish I could have seen them. Hard to see anything in the sky in DC.

By: NilsK

NilsK — Tue, 25 Aug 2009 16:11:13 +0000

That’s a very cool timelapse clip! But are we sure the presumed perseids are not (almost) all airplanes? At such long exposures and/or frame intervals, I’d expect individual meteors to be visible on only one frame, yet they seem to be moving across the screen at airplane velocities…

Edit: I just saw the HD version and there are indeed some nice one-frame streaks that I didn’t see on the low-res clip! Great work!

By: Chris

Chris — Tue, 25 Aug 2009 16:09:47 +0000

Anyone have any idea where this is???

By: Richard Drumm The Astronomy Bum

Richard Drumm The Astronomy Bum — Tue, 25 Aug 2009 15:46:45 +0000

I was going to submit this to Digg, but it’s already there:

http://positiv-world.blogspot.com/2009/08/earth-has-left-perseid-meteor-stream.html

I noticed that you can still see most stars after the sun rises. I didn’t know that was possible. Probably helps to be out west to see that happen…

I know that it’s a good idea (compositionally speaking) to have a foreground object in your shot, but I think having the radiant blocked by the bush (or whatever that is) didn’t help. I’ll make a mental note of this when I attempt this shot in the future.

By: Plutonium being from Pluto

Plutonium being from Pluto — Tue, 25 Aug 2009 14:29:49 +0000

Great if very short clip there, BA. Thanks!

Did you happen to observe any Perseid meteors yourself Dr Plait?

(Sadly, too far north & cloudy anyway here in South Oz for me. )
—
PS. Sorry this is a bit off topic here but, BA, did you happen to get my email(s) about the 20th anniversary of the Voyager II fly-past of Neptune back on August 25th 1989? I sent you a “Nine Neptunean facts” article idea to commemorate the occassion. Now I don’t mean to pester you (honest!) but I’d just love, love, lurve to see you post something about that event. Afraid I don’t have a blog of my own to post stuff like that on & am trying to help with science education a little. Pretty please with a Nereidean ice cube in Neptunean tequila on top?

- StevoR a.k.a Steven C. Raine

By: kuhnigget

kuhnigget — Tue, 25 Aug 2009 14:13:59 +0000

The perseids were pretty good this year, the best in several years, at least as seen from lovely Pasadena-in-the-Smog. Several really nice fireballs on the peak night.

And for once the neighbor turned his @%#@^#!!! light off, so I could actually look up without being blinded.

By: Mike

Mike — Tue, 25 Aug 2009 14:01:18 +0000

Heads up! Google has a relevant doodle today.

http://www.google.com/

By: John Paradox

John Paradox — Tue, 25 Aug 2009 13:46:39 +0000

Kewl, but who is Percy, and why should we care about his ID?

(Unless he’s been hanging out with the Krell!)

J/P=?