During this period the moon reaches its new phase on Monday February 8th. On that date the moon will be located near the sun and will not be visible at night. As the week progresses the waxing crescent moon will enter the evening sky but will not cause any problems to meteor observers. The estimated total hourly meteor rates for evening observers this week is near 3 for observers located in the northern hemisphere and 4 for observers located south of the equator. For morning observers the estimated total hourly rates should be near 10 as seen from mid-northern latitudes (45N) and 16 as seen from tropical southern locations (25S). 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 February 6/7. 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 center of the large Anthelion (ANT) radiant is currently located at 10:04 (151) +10. This position lies in western Leo, very close to the spot occupied by the 1st magnitude star known as Regulus (Alpha Leonis). Due to the large size of this radiant, Anthelion activity may also appear from Cancer, northwestern Hydra, and Sextans as well as western Leo. This radiant is best placed near 0100 local standard time (LST), when it lies on the meridian and is located highest in the sky. Rates at this time should be near 2 per hour as seen from the northern hemisphere and 1 per hour from south of the equator. With an entry velocity of 30 km/sec., the average Anthelion meteor would be of slow velocity.
The February Epsilon Virginids (FEV) were discovered by Kathryn Steakly & Dr. Peter Jenniskens using data from CAMS and SonotaCo. This shower is active from January 29-February 9, with maximum activity occurring on February 4th. The radiant is currently located at 13:36 (204) +10, which places it on the Bootes/Virgo border, 7 degrees east of the 3rd magnitude star known as Vindemiatrix (Epsilon Virginis). These meteors would be best seen near 0400 local standard time (LST) when the radiant lies highest above the horizon. Rates are expected to be less than 1 per hour during the last dark hour before dawn. These meteors are equally well seen from either hemisphere. These meteors encounter the atmosphere at 64 km/sec., which would produce mostly swift meteors.
The Alpha Centaurids (ACE) are active from January 28 though February 21, with maximum activity occurring on February 8. The radiant is currently located at 13:56 (209) -59. This position lies in southeastern Centaurus only 2 degrees northwest of the brilliant 1st magnitude star known as Hadar (Beta Centauri). Due to the southern declination of this radiant, these meteors are not well seen in the northern hemisphere. Current rates would be near 3 per hour as seen from the southern hemisphere and less than 1 from the northern hemisphere. These meteors are best seen near 0500 LST when the radiant lies highest above the horizon. At 56 km/sec. the Alpha Centaurids would produce mostly swift meteors.
The Pi Hydrids (PIH) were discovered in Dr. Peter Jenniskens and mentioned in his book Meteor Showers and their Parent Comets. Studies of the IMO video database by Sirko Molau and Juergen Rendtel confirmed the existence of this shower. These meteors are active from February 4-15, which maximum activity occurring on the 7th. At maximum the radiant is located at 14:00 (210) -21. This area of the sky is located in extreme southeastern Virgo, 6 degrees northwest of the 3rd magnitude star known as Pi Hydrae. These meteors are best seen near 0500 LST when the radiant lies highest above the horizon. Rates are expected to remain below 1, even at maximum activity. These meteors are visible over most of the Earth, with the southern hemisphere having slightly better viewing conditions. At 57 km/sec. the Pi Hydrids would produce mostly swift meteors.
As seen from the mid-northern hemisphere (45N) one would expect to see approximately 7 sporadic meteors per hour during the last hour before dawn as seen from rural observing sites. Evening rates would be near 2 per hour. As seen from the tropical southern latitudes (25S), morning rates would be near 12 per hour as seen from rural observing sites and 3 per hour during the evening hours. Locations between these two extremes would see activity between the listed figures.
|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)||–||10:04 (151) +10||30||01:00||2 – 1||II|
|February Epsilon Virginids (FEV)||Feb 04||13:36 (204) +10||64||04:00||<1 – <1||IV|
|Alpha Centaurids (ACE)||Feb 08||13:56 (209) -59||56||05:00||<1 – 3||II|
|Pi Hydrids (PIH)||Feb 07||14:00 (210) -21||57||05:00||<1 – <1||IV|