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Quadrantids Results(2017)

2017 Quadrantids showed a same activity as annual years. The maximum peak came around 14:00-16:00(UT) on 3rd Jan (solar longitude: 282°.2). In 2017, the ascending branch of FWHM was longer than descending branch. Although it was possible to see another sub-peak compornent around 3:00-4:00(UT) 3rd (solar longitude: 282°.7), this estimated result is worse than single estimated compornent. In this year, therefore, a single compornent has been adopted as official record.

Activity Level (using worldwide data)

Observed Peaks

Time(UT) Solar Long. Activity Level
Jan. 3 14h 283°.18 3.94 ± 0.76

Estimated Compornents of Quadrantid activity

Comp.No. Peak Time(UT) Solar Long. A(max) FWHM(hr)
QUA17C01 Jan. 3 15h30m 283°.22 4.0 -9.0/+5.0


  • Radiant : α = 230°.1, δ = +48°.5
  • Radian Elevation : 20° < h < 80°
  • Using data within ± 0.75 σ in all observed data.


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