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Re: (meteorobs) NAMN Notes: July 1999
mark>>But - a radiant is not a point. It is an area in the sky. Generalizing,
many
meteor showers have a radiant radius of about 5 degrees, making the diameter
of the area 10 degrees. In the IMO Meteor Shower Calendar that you printed
off from the IMO website at www.imodot net, the actual radiant sizes are given
in the individual shower writeups. Most are about 5 degrees in radius. Some
are larger.<<
Actually most radiants are quite small....that is less than about 2 degrees
in diameter. For purposes of shower association and taking into account for
the inaccuracies that is present for most visual observers, the shower
radiants are listed larger than what they really are. For examples, the
actual radiant diameters for the following showers determined
photographically are:
Perseids - 1.26 deg
S. Delta Aquarids - 1.41 deg
N. Delta Aquarids - 1.62 deg
Quadrantids - 1.13 deg
Lyrids - 0.25 deg
Draconids - 0.07 deg
Orionids - 0.84 deg
S. Taurids - 2.20 deg
N. Taurids - 1.94 deg
Leonids - 0.32 deg
Geminids - 0.49 deg
GeoZay
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