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(meteorobs) Meteor Activity Outlook for April 2-8, 2004
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To: "Meteorobs" <Meteorobs@atmob.org>
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Subject: (meteorobs) Meteor Activity Outlook for April 2-8, 2004
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From: "Kim Youmans" <ksyo@bellsouthdot net>
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Date: Wed, 31 Mar 2004 08:12:21 -0500
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Delivered-To: meteorobs-mhonarc2@galaxy.atmob.org
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Delivered-To: meteorobs@atmob.org
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Reply-To: meteorobs@atmob.org
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Sender: owner-meteorobs@atmob.org
The moon reaches its full phase on Monday April 5. At this time it will
be
located 180 degrees from the sun and will rise as the sun sets and set
as
the sun rises. This weekend and for the remainder of this period, the
moon
will be present in the early morning sky, limiting the meteor activity
to be
seen. The sources of meteors listed below are active during this period
but
will be difficult to observe. If your sky is transparent and the
limiting
magnitude exceeds +5.0, then you may be able to achieve some success
at
observing during this period. The estimated total hourly rates for
evening
observers this week is near one for those in the Northern Hemisphere
and two
for those located in the Southern Hemisphere. For morning observers
the
estimated total hourly rates should be near three for those located in
the
Northern Hemisphere and five for those in the Southern Hemisphere.
These
rates assume that you are watching from rural areas away from all
sources of
light pollution. The actual rates will also depend on factors such
as
personal light and motion perception, local weather conditions,
alertness
and experience in watching meteor activity. Rates are greatly
reduced this
week due to intense moonlight.
The positions listed below
are exact for Saturday night/Sunday morning April
3/4. The positions do not
change greatly day to day so these positions may
be used during this entire
period. Most star atlases (available at science
stores and libraries) will
provide maps with grid lines of the celestial
coordinates so that you may
find out exactly where these positions are
located in the sky. A planisphere
or computer planetarium program is also
useful in showing the sky at any time
of night on any date of the year.
Activity from each radiant is best seen
when it is positioned highest in the
sky, either due north or south along the
meridian, depending on your
location. Meteor activity is not seen from
radiants that are located below
the horizon. The radiants below are listed in
a west to east manner in order
of right ascension (celestial longitude). The
radiants listed first are
located further west therefore are accessible
earlier in the night while
those listed last rise later in the night. This
list also provides the order
of ascending velocity for each radiant with
those listed first usually being
much slower than those last on the list.
Velocity should not be the prime
factor for shower association as all showers
can produce slow meteors. Slow
meteors can be produced from normally swift
showers, such as the Leonids,
when meteors appear near the radiant or close
to the horizon. The true
velocity is only revealed in shower members seen far
from the radiant and
high in the sky.
The detailed descriptions of
each shower will return next week when
moonlight becomes less of a
factor.
Antihelion
(Virginids) 13:52
(208) -11
Northern
Apex
18:52 (283) -08
Southern
Apex
18:52 (283) -08
Delta
Pavonids
21:16 (319) -64
Clear Skies!
Robert Lunsford
AMS
Operations Manager