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Quadrantids Results(2012)

In 2012, the peak time was later than predicted peak time as 07h on 4th. The estimated activity profile shows that the main peak time was around λo=283°.465 (14h 4th:UT). The activity level was same as annual year. At that time, Europe observing stations were under zenithal effect. It is, therefore, possible that the activity level was weaker than real activity.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Jan. 4 03h 282°.998 4.06 ± 0.57
Jan. 4 14h 283°.465 4.10 ± 0.36

Estimated Compornents of Quadrantid activity

Trail-No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
QUA12C01 Jan. 4 08h30m 283°.210 4.0 -7.0/+8.0

Parameter

  • Radiant : α = 230°.1, δ = +48°.5
  • Radian Elevation : 25° < h < 75°
  • 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