C 2025 A6 Lemmon is a non-periodic comet discovered by the Mount Lemmon Survey in images obtained on 3 January 2025. It has an inbound orbital period of about 1 350 years and will pass perihelion on 8 November 2025 when it will be 79 million km from the Sun. This perihelion passage will reduce the orbital period to about 1 150 years. It makes its closest approach to Earth on 21 October 2025 at a distance of 90 million km.
Data gathered from 1 session 2025-10-17.
Data for this session: 40x6s.
Total number of exposures 40 with a total integration time of 4 minutes.
Processing: PixInsight.
Equipment: Sony FE 90mm f/2.8 and Sony A7IV on Innorel RT40C.
Location: 63 degrees north with a bortle 4 sky.