Comet Siding Spring Animation

Observers in the UK and Western Europe should find an observing location offering an unobscured eastern horizon an hour before sunrise on Sunday, 10 September to see innermost planet Mercury just 0.6 degrees from Regulus, the brightest star in Leo. Conspicuous planet Venus is your convenient celestial guide to finding Regulus, Mercury and Mars.

Don’t miss the chance to see Comet C/2025 A6 (Lemmon) as it races towards its closest approach of the Sun on 8 November.

NASA’s InSight spacecraft has passed the halfway point to Mars and remains on track for a 26 November landing in the Elysium Planitia region where it will become the first probe to study the red planet’s deep interior.