C/2021 A1 (Leonard)

  • ephemeris
  • Display observing conditions.

    Individual and sum spectra

  • table
  • figure 1 -- figure 1 (PS)
  • figure 2 -- figure 2 (PS)
  • figure 3 -- figure 3 (PS)
  • figure 4 -- figure 4 (PS)
  • figure 5 -- figure 5 (PS)
  • figure 6 -- figure 6 (PS)
  • figure 7 -- figure 7 (PS)
  • figure 8 -- figure 8 (PS)
  • figure 9 -- figure 9 (PS)
  • figure 10 -- figure 10 (PS)
  • figure 11 -- figure 11 (PS)
  • figure 12 -- figure 12 (PS)
  • figure 13 -- figure 13 (PS)
  • figure 14 -- figure 14 (PS)
  • figure 15 -- figure 15 (PS)
  • figure 16 -- figure 16 (PS)

    Notes

  • Perihelion on 3 January 2022 at q = 0.615 au.
  • Closest approach to Earth on 12 December 2021 at 0.23 au.
  • Galactic plane crossing on 14 December 2021 at l = 17°.
  • From 12 September to 14 December, daily observations limited to about 30 min due to work on the focal track.
  • From 9 to 16 November no observation due to a LO failure.
  • Outbursts beginning on Dec. 13. CBET No 5087.
  • Biver et al., 2024, in preparation