Month: September 2017

Meteor Activity Outlook for 23 – 29 September 2017

During this period the moon will reach its first quarter phase on Wednesday September 27th. At this time the moon will be located 90 degrees east of the sun and will set near 0100 local summer time (LST). This weekend the waxing crescent moon will set shortly after dusk, allowing meteor observers dark skies the remainder of the night. The estimated total hourly meteor rates for evening observers this week is near 4 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 16 as seen from mid-northern latitudes and 12 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. 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 September 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...

Read More

Radio Meteor Observation in the World : Monthly Report for August 2017

This report provides results of monthly report in Augsut 2017 and major two meteor showers that were δ-Aquariids and Perseids 2017. These results were provided by The International Project for Radio Meteor Observation(IPRMO). δ-Aquarrids had a possiblity that was weaker activity than annual years. On the other hand, Perseids was same activity level and profile as annual years. delta-Aquariids 2017 From the end of July to first of August, δ-Aquariids peak came to us. Although the clear activity was observed in this year, it had a possibility that the activity level in this year was weaker than annual years. The estimated maximum level was 2.5 at solar longitude = 126°.50 (29th July). FWHM has -72.0 hours and +84.0 hours. The beginning of clear activity was aruond solar longitude =118°. The ending was around 138°. After the peak time, the dereasing speed was later around 132°-134°. You can see past results: http://www.amro-net.jp/meteor-results/07_aqrdelta.htm. Perseids 2017 Perseids 2017 showed the same activity level as annual years. The estimated peak time was around solar longitude = 139°.91 (16:30(UT) on 12th August) with maximum activity level = 1.5. FWHM had -13.0 hours and +18.0 hours. Although higher activities were observed in 2014 and 2016, 2017 came back to 2013 activity level (annual activity level). You can see past results: http://www.amro-net.jp/meteor-results/08_perseids.htm. August, 2017 Following four graphs shows monitoring results in four areas that are Europe...

Read More

Meteor Activity Outlook for 16-22 September 2017

During this period the moon will reach its new phase on Wednesday September 20th. At this time the moon will be located near the sun and will be invisible at night. This weekend the waning crescent moon will rise just before dawn and will not pose any problems to those trying to view meteor activity.

Read More

SonotaCo network and CAMS

You might think that the newly developed CAMS video system can get much more fine results than the system of SonotaCo network. There are small differences between them surely, but the comparison between the statistics of them reveals both data are comparable in accuracy.  We find that the SonotaCo system cannot detect slow velocity meteors as good as CAMS but it is superior for faster meteors.  There is a more important difference between them, that is, the definition of meteor showers and this is resulting in curious stream data. 1 Devices and software Japanese meteor enthusiasts tried to use surveillance...

Read More

Stunning fireball on 12 Sept. 2017 at 1:35 universal time

This amazing fireball was recorded on the night of 12 September 2017 at 3:35 local time (1:35 universal time). The event was produced over Spain by a fragment from an asteroid that hit the atmosphere. The fireball began at a height of about 84 km and ended at an altitude of around 31 km. It was recorded in the framework of the SMART Project from the astronomical observatories of Calar Alto (Almería), La Hita (Toledo, Spain), Sevilla and Huelva....

Read More