|Aktywność meteorowa 23 II-1 III 2019
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|Autor:||Ireneusz Włodarczyk [ 24 lutego 2019, 15:35 ]|
|Tytuł:||Aktywność meteorowa 23 II-1 III 2019|
During this period the moon will reach its last quarter phase on Tuesday February 26th. At this time the moon will be located 90 degrees west of the sun and will rise near 0100 local standard time (LST). Useful meteor observations can be carrier out during the more active morning hours as long as you keep the moon out of your field of view. This weekend will be more difficult to view meteor activity as the gibbous moon will rise earlier and also be brighter than later in the week. Hourly meteor rates for evening observers this week is near 3 as seen from mid-northern latitudes (45N) and 4 as seen from tropical southern locations (25S). For morning observers the estimated total hourly rates should be near 5 as seen from mid-northern latitudes and 9 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 reduced during the morning hours due to 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 brighter 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 23/24 . 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 near 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 far 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 11:12 (168) +11. This position lies in southeastern Leo, 2 degrees southwest of the 4th magnitude star known as sigma Leonis) Due to the large size of this radiant, Anthelion activity may also appear from western Virgo and Sextans as well as 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 Mu Virginids (FMV) were discovered by Damir Šegon and the Croatian Meteor Network team based on studying SonotaCo and CMN observations (SonotaCo 2007-2011, CMN 2007-2010). These meteors are active from February 17 through March 5 with maximum activity occurring on February 26. The current radiant position lies near 16:16 (244) -02, which actually places it on the border of Ophiuchus and Sepens Caput, 3 degrees north of the pair of stars known as "Yeds" (epsilon and delta Ophiuchi). Rates are expected to be less than 1 per hour no matter your location. These meteors are best seen near 0500 LST when the radiant lies highest above the horizon. At 62 km/sec. the February Mu Virginids would produce mostly swift meteors.
As seen from the mid-northern hemisphere (45N) one would expect to see approximately 3 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 8 per hour as seen from rural observing sites and 3 per hour during the evening hours. Morning rates are reduced due to moonlight. 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
Anthelion (ANT) - 11:12 (168) +11 30 01:00 2 - 1 II
February mu Virginids (FMV) Feb 26 16:16 (244) -02 62 07:00 <1 - <1 IV
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