|Aktywność meteorowa 11-17 I 2020
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|Autor:||Ireneusz Włodarczyk [ 13 stycznia 2020, 10:41 ]|
|Tytuł:||Aktywność meteorowa 11-17 I 2020|
During this period the moon reaches its last quarter phase on Friday January 17th. At that time the moon will lie 90 degrees west of the sun and will rise near midnight local standard time (LST). This weekend the nearly full moon will rise as dusk ends and will remain in the sky all night long. It will rise later with each passing night but will still greatly interfere with meteor observations during the more active morning hours. The estimated total hourly meteor rates for evening observers this week is near 3 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 6 as seen from mid-northern latitudes (45N) and 5 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. Rates are reduced 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 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 11/12. 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.
Radiant Positions at 19:00 LST
Radiant Positions at 19:00 Local Standard Time
Radiant Positions at 00:00 LST
Radiant Positions at 00:00 Local Standard Time
Radiant Positions at 05:00 LST
Radiant Positions at 06:00 Local Standard Time
These sources of meteoric activity are expected to be active this week.
The detailed descriptions of each source will continue next week when viewing conditions will become much improved.
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) – 08:16 (124) +19 30 01:00 2 – 1 II
alpha Hydrids (AHY) Jan 03 08:52 (134) -11 43 02:00 <1 – <1 IV
kappa Cancrids (KCN) Jan 10 09:24 (141) +08 50 02:00 <1 – <1 IV
December Leonis Minorids (DLM) Dec 21 12:00 (180) +21 63 05:00 <1 – <1 II
eta Corvids (ECV) Jan 16 12:11 (183) -13 68 05:00 <1 – <1 IV
lambda Bootids (LBO) Jan 16 14:29 (217) +45 41 07:00 <1 – <1 IV
gamma Ursae Minorids (GUM) Jan 18 15:10 (228) +71 30 08:00 <1 – <1 IV
xi Coronae Borealids (XCB) Jan 16 16:36 (249) +30 49 09:00 <1 – <1 IV
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