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meteorobs · Amateur meteor astronomy

Group Information

  • Members: 440
  • Category: Astronomy
  • Founded: Aug 7, 1998
  • Language: English
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Description

The email mailing list 'meteorobs' is dedicated to email
discussions relating to amateur meteor astronomy. To post
a message to all other subscribers of the list, send it
as an email to the address:
meteorobs@meteorobs.org

To subscribe, unsubscribe, or change your options, you may EITHER use Yahoo! Groups, or use the direct Web form for our email list, at:
http://lists.meteorobs.org/mailman/listinfo/meteorobs

If you have questions or problems concerning the list, contact the administrators at:
owner-meteorobs@meteorobs.org


METEORS?
========
Meteor astronomy or "meteorics" is the area of astronomy
dealing with the study of meteors, or shooting stars. A
meteor results when a particle in space (actually called
a "meteoroid") enters the earth's atmosphere with a high
initial velocity and ionizes the gasses there, producing
visible light and a fiery "train".

By recording and studying the characteristics of these
fiery meteoroid deaths, astronomers can learn more about
the composition and origins of the solar system, dynamics
in our own atmosphere, the orbits and history of comets
and asteroids, and even some things about our own human
sensory apparatus!

METEOR OBSERVING
================
Meteor observing represents a unique opportunity for the
amateur astronomer for two reasons:
1. There are very few professional scientists in
the world studying meteors, so any quality data
which an amateur can gather is very valuable, and
2. The most common technique for observing meteors
involves nothing more complex than your naked eye,
and a clipboard or tape recorder. No telescopes,
strip charts, or other doohickeys required!

For this reason, amateur meteorics has been called "the last
bastion of naked eye astronomy". To learn more about meteors,
meteoroids, and meteor observing, visit our Website, or subscribe to this mailing list and ask some of the most experienced meteor observers in the world!

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Messages in this group are sent from a remote email list:meteorobs@meteorobs.org

Re: (meteorobs) Fisheye lens misunderstanding and photography update
Is aliasing really that important? There's two types and both have been covered in this discussion very well. One is optical distortion (curved image) caused
Posted - Mon Dec 7, 2009 9:11 pm
Meteorites USA
eric@...
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Re: (meteorobs) Fisheye lens misunderstanding and photography update
Thanks for explaining that Chris, but surely if you use a longer focal length to essentially get the same crop as Thomas posted (2nd image down on the page he
Posted - Mon Dec 7, 2009 9:09 pm
Leo S
l.stachowicz@...
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Re: (meteorobs) Fisheye lens misunderstanding and photography update
It is true aliasing, resulting from having higher spatial frequency components in the image than the spatial sampling frequency (the pixel spacing). It will
Posted - Mon Dec 7, 2009 8:32 pm
Chris Peterson
clp@...
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Re: (meteorobs) Fisheye lens misunderstanding and photography update
I wouldn't call this aliasing - it's just the effect of the fish-eye lens in turning straight lines into curves. Try taking a photo of a building in daylight.
Posted - Mon Dec 7, 2009 8:21 pm
Peter Hirons
peter@...
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Re: (meteorobs) Fisheye lens misunderstanding and photography update
Somewhat counter-intuitively, the aliasing is dependent only on the pixel size of the camera and the focal ratio of the lens. The field-of-view (essentially,
Posted - Mon Dec 7, 2009 8:08 pm
Chris Peterson
clp@...
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