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Ursids Result (2009)

The activity around peak time was clear such as 2008. The observed peak was around 0.8. This was over usual activity level with 0.0±0.4. Some calculated data show under zero. It had a possibility that background level was higher than real background level.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Dec. 22nd 08h 270°.487 0.77 ± 0.26

Estimated Compornents of Geminid activity

Comp.-No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
URS09C01 Dec. 22nd 09h30m 270°.529 0.6 -4.0/+2.0

Parameter

  • Radiant : α = 217°, δ = +76°
  • Radian Elevation : 25° < h < 70°
  • Using data within ± 0.75 σ in all observed data.

Reference

  • Structure of meteor activity is estimated by "Lorentz profile".
  • Observed data provided by RMOJ and RMOB