By Phoenix7777 – Own workData source: HORIZONS System, JPL, NASA, CC BY-SA 4.0
Comet C/2025 A6 (Lemmon) will approach Earth at a distance of 0.60 AU (90 million km) on 21 October 2025.
It is expected to reach an apparent magnitude of 3.5 to 4.4 according to different estimates, with the more optimistic predictions indicating that it could be visible to the naked eye from sufficiently dark skies. During its closest approach the comet will be visible in the sunset sky with a solar elongation of 42 degrees. It will cross the celestial equator on 2 November 2025. 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 0.53 AU (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 and may be visible to the naked eye 42 degrees from the Sun after sunset. As of 13 October 2025, the comet is about apparent magnitude 5.4, and is visible in binoculars about 20 degrees (approximately two fists) below the handle of the Big Dipper.
Comet C/2025 A6 (Lemmon) will approach Earth at a distance of 0.60 AU (90 million km) on 21 October 2025.
It is expected to reach an apparent magnitude of 3.5 to 4.4 according to different estimates, with the more optimistic predictions indicating that it could be visible to the naked eye from sufficiently dark skies. During its closest approach the comet will be visible in the sunset sky with a solar elongation of 42 degrees. It will cross the celestial equator on 2 November 2025. 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 0.53 AU (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 and may be visible to the naked eye 42 degrees from the Sun after sunset. As of 13 October 2025, the comet is about apparent magnitude 5.4, and is visible in binoculars about 20 degrees (approximately two fists) below the handle of the Big Dipper.
Comet C/2025 A6 (Lemmon): Complete Information & Live Data
De helderste komeet van 2025 komt eraan in oktober — mis Komeet Lemmon niet!
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C/2025 A6 (Lemmon) – COBS
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