пятница, 19 июля 2019 г.

Meteor Activity Outlook for July 13-19, 2019

Jason Ptaszek captured this fantastic green fireball at 08:15 Universal Time on  July 1, 2019, from Summer Lake, Oregon USA. Refer to AMS Fireball Report #2847-2019 © Jason Ptaszek

During this period the moon reaches its full phase on Tuesday July 16th. On that date the moon is located opposite the sun in the sky and remains above the horizon all night long. This weekend the waxing gibbous moon will set during the morning hours just before dawn, allowing a small opportunity to view under dark skies. The estimated total hourly meteor rates for evening observers this week is near 2 no matter your location. For morning observers the estimated total hourly rates should be near 8 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 during this period 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 July 13/14. 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 22:00 LDST


Radiant Positions at 22:00 Local Daylight Saving Time






Radiant Positions at 01:00 LDST


Radiant Positions at 1:00 Local Daylight Saving Time






Radiant Positions at 03:00 LDST


Radiant Positions at 4:00 Local Daylight Saving Time





These sources of meteoric activity are expected to be active this week.


The list below offers the information from above in tabular form. Rates and positions are exact for Saturday night/Sunday morning except where noted in the shower descriptions. Details of each source will continue next week when viewing conditions are more favorable.



































































































































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 19:16 (289) -13 22 01:00 <1 – <1 II
Anthelion (ANT) 20:16 (304) -19 30 02:00 1 – 2 II
Northern June Aquilids (NZC) Jul 03 21:20 (320) -02 41 03:00 1 – 1 IV
Southern June Aquilids (SZC) Jul 06 21:51 (328) -25 39 04:00 <1 – 1 IV
epsilon Pegasids (EPG) Jun 15 22:12 (333) +14 28 04:00 <1 – <1 IV
July Pegasids (JPE) Jul 11 23:24 (351) +12 68 05:00 <1 – <1 IV
Perseids (PER) Aug 13 00:20 (005) +50 59 06:00 <1 – <1 I
49 Andromedids (FAN) Jul 21 01:12 (018) +46 60 07:00 <1 – <1 IV
phi Piscids (PPS) Jul 05 01:16 (026) +28 67 07:00 1 – <1 IV
psi Cassiopeiids (PCA) Jul 22 01:26 (022) +71 42 07:00 <1 – <1 IV
c-Andromedids (CAN) Jul 09 02:17 (034) +50 58 08:00 1 – <1 IV
July chi Arietids (JXA) Jul 13 02:26 (036) +09 69 08:00 1 – 1 IV

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