Meteor Activity Outlook for June 1-7, 2007

June is a slow month for meteor activity, especially as seen from the northern hemisphere. The June Lyrids peak mid-month but add little to the overall activity. The June Bootids peak near months end but can be totally absent. Sporadic rates as seen from the northern hemisphere are lowest this month. From the southern hemisphere sporadic rates are quite strong with much of this activity provided by unknown ecliptical radiants which ride high in the sky this time of year as seen from south of the equator.

During this period the moon reaches its full phase on Friday June 1. The moon will remain a major factor during this entire period obscuring all but the brightest meteors. The sources of meteors listed below are active during this period but will be difficult to observe this week due to the lunar glare. If your sky is transparent and the limiting magnitude exceeds +5.0, then you may be able to achieve some success. 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 five for those viewing in the northern hemisphere and eight 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 reduced this week due to intense moonlight.

The radiant positions listed below are exact for Saturday night/Sunday morning June 2/3. 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. Doing this 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 full descriptions of each active meteor shower will continue next week when the moon becomes less of a nuisance to observers.