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Ursids Result (2005)

Although it was showen that the increase of activity level between λo270°.6 and 270°.7, the activity level was weak such as 0.45 and estimated peak level was 0.3. This means it was difficult to separate background level and Ursid activity.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Dec. 22nd 00h 270°.683 0.45 ± 0.25

Estimated Compornents of Geminid activity

Comp.-No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
URS05C01 Dec. 22nd 14h30m 270°.768 0.3 -8.0/+3.0

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