- C/2021 T4 (Lemmon)

C/2021 T4 (Lemmon) is a long-period comet discovered on October 7, 2021, by the Mount Lemmon Observatory in the USA.

• Perihelion: 31 July, 2023 (magnitude 8.2)
• Closest approach to Earth: 20 July, 2023 (magnitude 7.8)