February offers the meteor observer in the northern hemisphere a couple of weak showers plus falling sporadic rates. This may not seem too exiting but you never know when surprises are in store. An errant earthgrazer from the Centaurid complex may shoot northward. Better yet, a bright fireball may light up the sky. February is the start of the fireball season, when an abundance of fireballs seem to occur. This lasts well into April and seems to occur mostly during the early evening hours.
Observers in the southern hemisphere are treated to the Alpha Centaurid peak on the 8th plus the entire Centaurid complex of radiants is active all month long. This is reminiscent of the summer activity seen from the northern hemisphere in the Milky Way constellations of Perseus and Auriga during August and September. Sporadic rates also peak this month south of the equator this month adding to the celestial show.
During this period the moon reaches its full phase on Tuesday February 3rd. At this time the moon is located opposite the sun and will lie above the horizon all night long for observers located in mid-northern latitudes. This weekend the waxing gibbous moon will set near the beginning of dawn so there will not really be any opportunity to view meteor activity under dark skies. 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 5 for observers situated at mid-northern latitudes and 6 for observers viewing from the southern tropics. Rates are reduced during this period due to moonlight. 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. 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 January 31/February 1. 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. Details of each source will be available next week when the situation with moonlight improves.
|SHOWER||DATE OF MAXIMUM ACTIVITY||CELESTIAL POSITION||ENTRY VELOCITY||CULMINATION||HOURLY RATE||CLASS|
|RA (RA in Deg.) DEC||Km/Sec||Local Standard Time||North-South|
|Anthelions (ANT)||–||09:40 (145) +12||30||01:00||1 – <1||II|
|February Epsilon Virginids (FEV)||Feb 04||13:12 (198) +12||64||04:00||<1 – <1||IV|
|Alpha Centaurids (ACE)||Feb 08||13:28 (202) -57||56||04:00||<1 – 1||II|
|Alpha Coronae Borealids (ACB)||Jan 28||15:46 (236) +22||57||06:00||1 – <1||IV|
|Feb. Eta Draconids (FED)||Feb 04||15:55 (239) +61||32||06:00||<1 – <1||IV|