| Posted on Aug 12, 2010 12:29:32 AM | William Cooke | 71 Comments | |
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I am asked this question over and over again, and it's a good one. Everyone knows that you have to be in the right place to observe solar eclipses and other astronomical goings-on, so why should meteor showers be any different?
You do have to be in the right part of the planet to view meteor outbursts or storms, because the trails of comet debris are so narrow (hundreds of thousands of miles) that it only takes a few hours for the Earth to pass through the stream. A few hours is not enough time for the Earth to do a complete rotation (which takes 24 hours), so only those people located in areas where it is night and where the radiant is visible will be able to see the outburst or storm. These dramatic events require the viewers to be in the right ranges of both latitude AND longitude.
This is not true for normal meteor showers, like this year's Perseids. The main stream of particles extends for millions of miles along Earth's orbit, requiring days for it to cross. All we need is one day to take the longitude out of the visibility calculations, because then the entire planet will experience night while the shower is still going on. That's the good news.
The kicker is that we not only have to have darkness, but also the radiant -- in this case, located in the constellation of Perseus -- has to be visible, i.e. above the horizon. The elevation of the radiant depends in part on latitude of the observer, and one can derive -- or look up, in this age of Google -- a relatively simple equation that gives the maximum elevation of the radiant:
maximum elevation = 90 – |dec -lat|
where dec is the declination of the radiant and lat is latitude of the observer (all in degrees). The vertical lines before dec and after lat mean to take the absolute value of dec -- lat. In order to see meteors from the shower, the maximum elevation must be 0 or greater (preferably more than 15 degrees). In the case of the Perseids, dec = 58 deg, so it is easy to calculate the maximum elevation for various latitudes:
We see that everyone in the northern hemisphere has a shot at seeing Perseids (weather permitting), but folks south of -32 degrees latitude get the shaft.
On the world map above, the red shaded area is the region where the Perseids will not be visible. If you live south of Brazil, at the very southern tip of Africa, or southern Austrailia, you need to take a road trip to the North if you wish to see Perseids. If you want see decent numbers, it will be a long ride, as you need to trek to somewhere above -17 degrees latitude.
So will I see Perseids? You can find out on your own -- look up your latitude (remember, Google is your friend), use the equation above, stick in 58 degrees for the dec, and calculate the maximum elevation. If it is above 15 degrees, you are good.
Remember to get away from city lights. A dark sky is important.
Enjoy the show!
Tags : Bill Cooke, Marshall Space Flight Center, Perseids, meteor
What time can i see them im excited.
HI IM FROM OHIO JUS WONDERING WHEN THE BEST TIME TO SEE THE METEOR FROM WHERE I AM??
do you have where we can watch on here, went out its awesome too see such amazing things, but I have children stayed out as long as i could. where can i see it online!
Hi Maria!
The Meteor Counter App for iOS can be found at http://itunes.apple.com/us/app/meteor-counter/id466896415?mt=8
The Meteor Counter for Android phones can be found at https://play.google.com/store/apps/details?id=org.meteorcounter.MeteorCounter
Hope you enjoy the Perseids!
Kind regards,
Bill Cooke
Hello NASA friends! We are planning to watch the event in Santo Domingo and La Romana, Dominican Republic, all the GLOBE schools are informed. As a member of the Education Advisory Committee of NASA´s GLOBE Program we also informed all the GLOBE schools around the world so they can see the event too. I read about an application for the cell phone to count the stars. Can you send me the link so I can share it with our GLOBE schools.
Thanks for sharing this wonderful event!
good job
good
Where should i look in toronto
at what time can i see the meteor shower tonight november 17 2010 inkissimmee fl??? please i want to see it =)
will it be visible from Australia?
Didn't quite understand the article..
Great article! kepp up the interesting work!
Was up for 3 hours hunting for Perseids in the SF Bay Area. Only say 7-8 in the 3 hours from 12:30am-3:30am. so disappointing. Perhaps not dark enough? I drove up in the hills along 280, but perhaps still not dark enough.
Whatever it was, it was NOT impressive.
Nice cool info,Thanks.
Thanks for that awesome article, it was honestly one of the best I've read in a long time! Google is my friend.
I live in Phoenix and at approximately 2:52 a.m. I saw a giant meteor in the northeastern sky. MORE than 2 seconds long. Amazing. Phenomenal. Wondering about about the giant meteor the size of Texas that missed the Earth. By 2,000 miles a while ago. Any idea if it could swing back around?
.
Ahhhhhhhhh, I saw it on August 8th. But I just saw 1 and it was frighteningly beautiful. I did not expect to see, so it was a surprise!
Oh, I will look to the sky all night!
CARPE NOCTUM!
on my birthday wow pretty cool? huh?nature favors me? m
when does the meteors start? what time? on august 12
Thank you for a nice and informative article. I live in the northern part of Norway. Up here (Lat 69 degree) it is no chance to see the meteors. It is simply not dark enough at midnight.
Respectfully Yours
Even A. Bjørsmo
quiero ver eso por primera ven
will i be able to record this i am in huntsville alabama
Look at the map.
If you are not in the red, then you have a chance to see it.
If you really want to get crazy, then you can use the equation.
In conclusion, if you're in the Northern Hemisphere, you're cool.
Will the Perseid shower be visible from Sao Paulo, Brazil?
can you see the meteor shower from the dominican republic?
will it be visible in puerto rico ????
does anyone know what time i might see them if i live in the gta
hello .. am in brazil , in rio is it possibel to see here ???
Sitting in an open field in Lake Co. FL, and there is not much going on here except stars and plaines.
to the 13 year old..i'm 31 and have never seen one. i live far away from the city way out in the country absolutely no street lights. I don't knwo how to use the formula and I just finished astronomy class. to the owner of this blog. I live in cleveland tennessee, so what time woudl be best for viewing?
H. I live in tennessee and from about 1145 till about 1245, i was looking at a mostly clear sky to the northeast in pure darkness no city lights or anything and seen nothing but a few stars and i did notice jupitor. Why was i not able to see the meteor shower? I have never seen one in my 31 years on this great planet and i was hoping that this would be the best year to.
Will I get to see it in Los Angeles?
i live in springfield mo, will i see anything now?
if im in the south california district should i be facing west, east, north, or south to see the shower?
Hello, i live in Miami, Fl. I went down to Key West Fl. and i must say i have experienced one of the joy mother earth gives us.. if i may, i saw this huge white light descending from the sky i best can describe it this way it had kinda of a ball type of looking beginning and it had like a narrow ending at the end, this wht i call shooting star lingered for about 2 seconds.
Saw one in the South-Eastern skies of Colorado. Otherwise there is just tons of stars that are flickering, it is so stunning. Is that normal, for stars to flicker like that when a shower is supposed to be occurring?
if i did not see the meteor shower on thursday 12th of august will i be able to see it on 13th of august at night this year? will i be able to see it if i am in france? when is the next perseids meteor shower?
Thanks. please write back.
Has anyone seen them yet? What was it like?
Can I see them from Allen, Texas?
saw 2 at about 1:15 am south carolina spartanburg area
I was upside and I only saw the BIG star, I don't know if this a special comet or something...
My little bro and I live in the bahamas we are so excited we are staying up to watch the show.Can't wait!!!!
Can u guys send me some pics from space I want to learn some more
I am not sure if the meteor shower will last till tonight at Singapore time
cool
Will the Perseids be visible at Frankfort, Michigan? What time of noght will they be most visible. which direction should I look?
Also, family in Jacksonville, FL are attempting to see also. Will they be able to? What direction should they look?
When can we see at 44.63N 86.23W? Which direction do we look?
can you see the meteor shower in the dominican republic?
will i see it im in USA?
will i be able to see it in cleremont, Fl?
what time should michigan look for them?
and how do u know where in the sky to look for them?
This is fine4. It still doesn't tell me what direction to be looking where I'll see the most meteors.
Dan in Florida.
Will the Perseid shower be visible from san jose ca?
I'm in Derbyshire england what time will I see the shower?
Thank you, Dr. Cooke for your valuable knowledge and the heads-up for tonight!
I don't know exactly what this article meant when it said "it only takes a few hours for the Earth to pass through the stream," but it certainly doesn't mean that the meteor shower only lasts for a few hours each year. The Perseids meteor shower lasts for over a month, starting in mid-July and reaching its peak on the night of August 12 and the morning of August 13, which means tonight (August 12) is the best night to go outside and look for meteors. There will still be meteors visible after tonight, but if you want to see the most, go somewhere away from city lights and watch sometime after midnight - after 2 AM would probably be the best time.
Not only will we not be able to see it but now people think we live in aus trail ila :( correct spelling from the original term terra australis is Australia, :) by the way I love 99.9% of NASA's work including the multitude of very intelligent people working there. Not to mention many of the wonderful and valuable things I have learnt from your website. Keep up the good work and thankyou for your inventions, especially battery powered tools :) and your invaluable contributions to our scientific knowledge of the world/universe around us.
I am so excited for this but I don't know if I will be able to see anything.
Will the Perseid shower be visible from Hoover, Alabama 35244?
Meteors burn up high in the sky. If I see a meteor directly overhead, how far away will someone else be able to see it from?
Boston, MA is supposed to be cloudy tonight... do you think that we'll still get a good show if we find a nice meadow tomorrow night?
Omg im 13 Year's old and there's people on here asking if they can see the meteor shower ?!
Wooow... I just typed my county and looked at the Equasion and BAM !
Easy as that, seriously people you don't have too be a Genius too work that out -_-
The shower may start at 10pm but will be most visible from 3-4am.
The UK will most likely be able to see it.
And yes, 50 N should be able to see it as well.
TIMINGS?
will we see the shower from south wales in the uk ?
Thanks for the informative post. We'll be in the dark dark countryside to see the peak!
will it be visible from tampa, fl?
Will I be able to view the meteor shower from the west coast(USA)? And if so, what local time should I look for it? Thanks!
I just saw our first one in Ohio 9:42 pm
Hello! Thank you very much about this information. I am a meteorologist to be so I am so happy to have all of you doing this stuff to make "fans" understand in a better way the space...
You mentioned the Earth only takes a few hours to move through the trail of debris. Which few hours (in GMT) are expected for this shower?
ok, not being a whiz at this calculation..... we are at 50.19058N and 104.90445W will we see them if it is clear tonight? heres to hoping that we will...we missed the northern lights because of cloud cover....but we see them often here anyway...Jeanne Perkin
i want to know i will get to see the shower i live in the
uk