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Ursids Result (2011)

Almost of calculated data were included in usual activity level as 0.0±0.4. It was therefore impossible to separate background and Ursid activity. In addition, a difference between observed peak data and estimated peak data was seen. Urisid activity in 2011 was uncertain.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Dec. 21st 04h 268°.773 0.36 ± 0.20

Estimated Compornents of Geminid activity

Comp.-No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
URS11C01 Dec. 24th 03h30m 271°.787 0.2 -3.0/+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