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Ursids Result (2004)

Ursids 2004 showed non-high activity level that peak level was 0.4. This activity level was under background level + 1σ. In addition, FWHM was wider than other years. It was therefore difficult to disucess Ursid clear activity.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Dec. 22nd 12h 270°.949 0.60 ± 0.44

Estimated Compornents of Geminid activity

Comp.-No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
URS04C01 Dec. 22nd 11h30m 270°.906 0.4 -7.0/+4.0

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