|Aktywność meteorowa 8-14 VII 2017
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|Autor:||Ireneusz Włodarczyk [ 08 lipca 2017, 06:43 ]|
|Tytuł:||Aktywność meteorowa 8-14 VII 2017|
During this period the moon reaches its full phase on Saturday July 8. At that time the moon will rise near dusk and set near dawn. Since the brilliant moon lie above the horizon most of the night, it will be difficult to observe meteor activity. The moon's glare will effectively obscure all but the brighter meteors. As the week progresses the moon rises later with each passing night. This will allow a short interval between dusk and moonrise when the sky will be dark. Unfortunately meteor rates at this time of night are near their lowest. The estimated total hourly meteor rates for evening observers this week is near 2 for those viewing from the northern hemisphere and 3 for those located south of the equator. For morning observers the estimated total hourly rates should be near 9 no matter your location. 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 due to moonlight during this period. 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 July 8/9. 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 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.
Detailed descriptions of each stream will continue next week when the situation with interfering moonlight improves.
SHOWER DATE OF MAXIMUM ACTIVITY CELESTIAL POSITION ENTRY VELOCITY CULMINATION HOURLY RATE CLASS
RA (RA in Deg.) DEC Km/Sec Local Daylight Saving Time North-South
alpha Capricornids (CAP) Jul 27 19:02 (285) -14 22 01:00 1 - 1 II
Anthelions (ANT) - 19:56 (299) -21 30 02:00 1 - 2 II
Northern June Aquilids (NZC) Jul 03 21:00 (315) -04 38 03:00 1 - 1 II
Microscopiids (MIC) Jul 06 21:32 (323) -27 39 03:00 <1 - <1 IV
epsilon Pegasids (EPG) Jul 11 21:56 (329) +12 28 03:00 <1 - <1 IV
July Pegasids (JPE) Jul 10 23:08 (347) +11 68 04:00 1 - 1 IV
psi Cassiopeiids (PCA) Jul 22 00:52 (013) +69 42 05:00 <1 - <1 IV
phi Piscids (PPS) Jul 02 01:24 (021) +27 66 06:00 <1 - <1 IV
c-Andromedids (CAN) Jul 09 01:56 (029) +48 58 07:00 1 - <1 IV
July chi Arietids (JXA) Jul 13 02:08 (032) +08 69 07:00 <1 - <1 IV
Zgodnie z Robert Lunsford, IMO
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