"During this period the moon reaches its last quarter phase on Thursday
June 19th. At this time the moon will lie 90 degrees west of the sun and
will rise between midnight and 0100 local daylight (LDT) time as seen
from mid-northern locations. This weekend the waning gibbous moon will
rise a few hours after dusk and will remain above the horizon the
remainder of the night. The bright moon will make it difficult to view
any meteor activity as the lunar glare will obscure all but the
brightest meteors. The estimated total hourly meteor rates for evening
observers this week is near 1 for observers situated at mid-northern
latitudes and 2 for observers viewing from the southern tropics
(latitude 25 S.). For morning observers the estimated total hourly rates
should be near 3 for observers situated at mid-northern latitudes and 6
for observers viewing from the southern tropics. 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 lower this week due to the bright moonlight. Note that the hourly
rates listed below are estimates as viewed from dark sky sites away from
urban light sources. Observers viewing from urban areas will see less
activity as only the brightest meteors will be visible from such
locations.
The radiant (the area of the sky where meteors appear to shoot from)
positions and rates listed below are exact for Saturday night/Sunday
morning June 14/15. These positions do not change greatly day to day so
the listed coordinates may be used during this entire period. Most star
atlases (available at science stores and planetariums) 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 latitude. It must be
remembered that meteor activity is rarely seen at the radiant position.
Rather they shoot outwards from the radiant so it is best to center your
field of view so that the radiant lies at the edge and not the center.
Viewing there will allow you to easily trace the path of each meteor back
to the radiant (if it is a shower member) or in another direction if it
is a sporadic. Meteor activity is not seen from radiants that are
located below the horizon. The positions below are listed in a west to
east manner in order of right ascension (celestial longitude). The
positions listed first are located further west therefore are accessible
earlier in the night while those listed further down the list rise
later in the night.
These sources of meteoric activity are expected to be active this week.
The detailed descriptions of each shower will return next week when
viewing conditions are more favorable.
Anthelions (ANT) - 18:24 (276) -23 Velocity - 29km/sec.
Northern Hemisphere - 1 per hr. Southern Hemisphere - 2 per hr
Pi Piscids (PPS) - 00:12 (003) +16 Velocity - 69km/sec.
Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.
Clear Skies!
Robert Lunsford
American Meteor Society"
katt a nagyításért! Gyönyörű!
