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(meteorobs) Meteor Activity Outlook for February 14-20, 2003
The moon reaches its full phase on Tuesday February 18. For this entire
period the moon will be in the sky most of the night making conditions
difficult for viewing meteor activity. The sources of meteors listed
below are active during this period but as stated above, 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 should be near 2 for everyone regardless of
location. For morning observers the estimated total hourly rates should
be near 4 for those located in the Northern Hemisphere and 6 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 significantly reduced by moonlight
during this period.
The positions listed below are exact for Saturday night/Sunday morning
February 15/16. 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.
Delta Velids 08:48 (132) -53
Delta Leonids 10:40 (160) +19
Antihelion (Virginids) 10:44 (161) +07
Omicron Centaurids 11:56 (179) -57
Theta Centaurids 14:08 (212) -42
Alpha Centaurids 14:40 (220) -61
Northern Apex 15:44 (236) -04
Southern Apex 15:44 (236) -34
Clear Skies!
Robert Lunsford
AMS Operations Manager
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