Overview
- C/2025 R2 (Swan25B), recently imaged by a spacecraft, is forecast to pass about 30 million kilometers from Earth around 20 October with an uncertainty of plus or minus five days.
- The object should appear low after sunset and is expected to be detectable with binoculars, shifting from the southwest in October to the south in early November before fading from view.
- C/2025 A6 (Lemmon), discovered in January by the Mount Lemmon Survey, is calculated to approach to roughly 90 million kilometers on 21 October and reach perihelion on 8 November.
- Lemmon is a long-period comet last seen about 1,396 years ago, with its next return estimated around the year 3421.
- Viewing prospects near 21 October are favorable thanks to a new moon and the Orionids meteor shower, though brightness estimates for both comets remain subject to revision as observations continue.