(meteorobs) Meteor Activity Outlook for September 25-October 1, 2010

Robert Lunsford lunro.imo.usa at cox.net
Fri Sep 24 16:25:40 EDT 2010


September offers longer nights in the northern hemisphere that tend to be less hazy than those experienced in mid-summer. In the 
sky, no major showers are visible from either hemisphere but the northern hemisphere enjoys the advantage of higher sporadic rates. 
Most of the shower activity this month is produced from the Perseus-Aurigid complex active this time of year. These showers rarely 
produce more than five meteors per hour but still manage to produce most of the shower activity seen this month. Unfortunately the 
Perseus-Aurigid complex lies too low in the northern sky for southern hemisphere observers to view very well. Video studies have 
shown that the Southern Taurids are visible as early as September 7th therefore after this date the Antihelion radiant will no 
longer be listed until the Taurid showers end in December. The Antihelion meteors are still active but their radiant is superimposed 
upon that of the more numerous Taurids, therefore it is impossible to properly separate these meteors. Observers in the southern 
hemisphere suffer from some of their lowest rates of the year this month. The Southern Taurid radiant is not too badly placed so 
observers south can expect to see a little of this activity this month.

During this period the moon reaches its last quarter phase on Friday October 1st. At this time the moon will be located ninety 
degrees west of the sun and will rise near 0100 for those located at mid-northern latitudes. This weekend the waning gibbous moon 
will rise during the late evening hours and will severely hamper any attempts to view meteor activity. The estimated total hourly 
rates for evening observers this week is near three from the northern hemisphere and one for observers south of the equator. For 
morning observers the estimated total hourly rates should be near eight from the northern hemisphere and four as seen from the 
southern hemisphere. 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. Meteor rates are reduced this week due to severe interference from 
moonlight.

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 September 25/26. 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.

The following showers are expected to be active this week. The detailed descriptions will be continued next week when the moonlight 
is not as troublesome.

Southern Taurids (STA) - 01:20 (020) +06   Velocity - 30km/sec.
Northern Hemisphere - 2 per hr.   Southern Hemisphere - 2 per hr.

*For a detailed explanation on the different classes of meteor showers and other astronomical terms, please visit: 
http://www.amsmeteors.org/showers.html#X2010

Clear Skies!
Robert Lunsford
American Meteor Society 




More information about the Meteorobs mailing list