Leonids
In 1999 and 2001, great meteor storms were observed in the world. There a lot of bright meteors because of the fastest geocentric velocity in all meteor showers. The meteor astronomy had advanced whenever outbursts such as storm came. in recent years, the prediction of meteor shower activity with using dust-trail model had advanced.
In Radio Meteor Observation, there are a lot of long echoes because of the fast geocentric velocity. In 2001 and 2002, it was not able to count the number of meteor echoes since observed data were covered with a lot of long echoes. In the average year, however, it is too weak activity to catch and to determin the peak time of the Leonid activity in Radio Meteor Observation.
The prediction of Leonid outburst in 2009 --- The Latest Information
Jeremie Vaubaillon et al. predicts for Leonid outburst in 2009. In 2008, the unexpected outburst was observed visual and radio observation. They research the mechanism of this outburst, and published the prediction of Leonids in this year.
The observing condition is so good for both visual and radio observation.
| Dust Trail | 1466 (16-rev) | 1533 (14-rev) |
|---|---|---|
| Time | 21:43(UT) on Nov.17th, 2009 (Solar Longitude: 235°.54461) |
21:50(UT) on Nov.17th, 2009 (Solar Longitude: 235°.54952) |
| Δ | -0.000447AU, fM: 0.195 | -0.000553AU, fM: 0.114 |
| estimated ZHR | ZHR = 115 | ZHR = 80 |
References
IMCCE Meteor Shower Ephemerides Server
Science@NASA
Information of Leonids
| Name | Leonids |
|---|---|
| IMO Code | LEO |
| Solar Longitude(MAX) | 235°.27 |
| Radiant | α = 152° / δ = +22° |
| feature | ZHR(max):?, r=2.9, V∞:71km/s |
| Parant Comet | 55P/Tempel-Tuttle |
| Reference | The International Meteor Organization |
Condition of observation in maximum night (2009 - 2015)
| Nov. | MAX.Time(UT) | moon 18th 0h |
comments |
|---|---|---|---|
| 235.27(IMO) | |||
| 2009 | 17th 15h 17th 22h |
1 | Outburst as HR 100 is predicted around 22h on 17th(UT) |
| 2010 | 17th 21h | 12 | |
| 2011 | 18th 03h | 22 | |
| 2012 | 17th 10h | 4 | |
| 2013 | 17th 16h | 15 | |
| 2014 | 17th 22h | 25 | |
| 2015 | 18th 04h | 6 |
Results
Result of Leonids is recorded.(mainly Radio Meteor Observation)
Result of Leonids